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BIOXI17: BREATHING AND EXCHANGE OF GASES

338787 Respiratory movements are controlled by

1 Cerebellum

2 Cerebrum

3 Medulla oblongata

4 Crura cerebri

Explanation:

The medulla oblongata basically detects carbon dioxide $({CO}_{2})$ and Oxygen $(O_{2})$ levels in the bloodstream and determines what changes need to happen in the body. It can then send nerve impulses to muscles in the heart and diaphragm.

BIOXI17: BREATHING AND EXCHANGE OF GASES

338788 Neural signal from which centre can reduce the duration of inspiration is (Inspiration inhibition)

1 Chemosensitive area

2 Respiratory rhythm centre

3 Receptors associated with aortic arch and carotid artery

4 Pneumotaxic centre

BIOXI17: BREATHING AND EXCHANGE OF GASES

338789 Assertion :
A chemosensitive area is situated adjacent to the rhythm centre which is highly sensitive to ${CO}_{2}$ and hydrogen ions.
Reason :
The role of oxygen in the regulated of respiratory rhythm is quite insignificant.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.

2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.

3 Assertion is correct but Reason is incorrect.

4 Both Assertion and Reason are incorrect

Explanation:

A chemosensitive area is situated adjacent to the rhythm centre. This is highly sensitive to ${CO}_{2}$ and hydrogen ions. Increase in these substances can activate this chemosensitive area. This; in turn; gives signal to the rhythm centre to make necessary adjustments in the respiratory process so that these substances can be eliminated. The role of oxygen in the regulation of respiratory rhythm is quite insignificant because there is no receptor for oxygen in carotid artery and aortic arch which sends information to respiratory rhythm centre for regulation of respiratory rhythm. There are receptors carbon dioxide and hydrogen ion in oxygen in carotid artery and aortic arch. As soon as they bind, signals are sent to respiratory rhythm centre to control the respiratory process. Therefore role of oxygen is controlling respiratory rhythm process insignificantly.

BIOXI17: BREATHING AND EXCHANGE OF GASES

338790 The respiratory process is regulated by respiratory rhythm centre present in medulla of the brain, which is?

1 Stimulated by lower

O_{2}

and

H^{+}

concentration in aortic arch

2 Stimulated by higher

{CO}_{2}

and higher

H^{+}

concentration.

3 Inhibited byhigher

O_{2}

and

H^{+}

concentration

4 Stimulated by lower

O_{2}

and

H^{+}

concentration in carotid artery

Explanation:

Respiratory rhythm centre is present in medulla region of brain. There is a chemosensitive area, adjacent to respiratory rhythm centre, it is sensitive to ${CO}_{2}$ and $H^{+}$ ions. Receptors associated with aortic arch and carotid artery also recognize changes in concentration of ${CO}_{2}$ and $H^{+}$ concentration and send signals to respiratory rhythm centre.

BIOXI17: BREATHING AND EXCHANGE OF GASES

338791 Identify which of the following is incorrect?
i. Incase of forceful expiration, lungs become empty
ii. Exchange of gases in the lungs is interrupted during expiration.
iii. Chemosensitive area of respiratory centre in medulla is affected by excess ${CO}_{2}$ and $H^{+}$ ions
iv. Respiratory movements are controlled by ${CO}_{2}$ concentration of arterial blood

1 ii and iii only

2 i and ii only

3 i only

4 iii and iv only

BIOXI17: BREATHING AND EXCHANGE OF GASES

338787 Respiratory movements are controlled by

1 Cerebellum

2 Cerebrum

3 Medulla oblongata

4 Crura cerebri

Explanation:

The medulla oblongata basically detects carbon dioxide $({CO}_{2})$ and Oxygen $(O_{2})$ levels in the bloodstream and determines what changes need to happen in the body. It can then send nerve impulses to muscles in the heart and diaphragm.

BIOXI17: BREATHING AND EXCHANGE OF GASES

338788 Neural signal from which centre can reduce the duration of inspiration is (Inspiration inhibition)

1 Chemosensitive area

2 Respiratory rhythm centre

3 Receptors associated with aortic arch and carotid artery

4 Pneumotaxic centre

BIOXI17: BREATHING AND EXCHANGE OF GASES

338789 Assertion :
A chemosensitive area is situated adjacent to the rhythm centre which is highly sensitive to ${CO}_{2}$ and hydrogen ions.
Reason :
The role of oxygen in the regulated of respiratory rhythm is quite insignificant.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.

2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.

3 Assertion is correct but Reason is incorrect.

4 Both Assertion and Reason are incorrect

Explanation:

A chemosensitive area is situated adjacent to the rhythm centre. This is highly sensitive to ${CO}_{2}$ and hydrogen ions. Increase in these substances can activate this chemosensitive area. This; in turn; gives signal to the rhythm centre to make necessary adjustments in the respiratory process so that these substances can be eliminated. The role of oxygen in the regulation of respiratory rhythm is quite insignificant because there is no receptor for oxygen in carotid artery and aortic arch which sends information to respiratory rhythm centre for regulation of respiratory rhythm. There are receptors carbon dioxide and hydrogen ion in oxygen in carotid artery and aortic arch. As soon as they bind, signals are sent to respiratory rhythm centre to control the respiratory process. Therefore role of oxygen is controlling respiratory rhythm process insignificantly.

BIOXI17: BREATHING AND EXCHANGE OF GASES

338790 The respiratory process is regulated by respiratory rhythm centre present in medulla of the brain, which is?

1 Stimulated by lower

O_{2}

and

H^{+}

concentration in aortic arch

2 Stimulated by higher

{CO}_{2}

and higher

H^{+}

concentration.

3 Inhibited byhigher

O_{2}

and

H^{+}

concentration

4 Stimulated by lower

O_{2}

and

H^{+}

concentration in carotid artery

Explanation:

Respiratory rhythm centre is present in medulla region of brain. There is a chemosensitive area, adjacent to respiratory rhythm centre, it is sensitive to ${CO}_{2}$ and $H^{+}$ ions. Receptors associated with aortic arch and carotid artery also recognize changes in concentration of ${CO}_{2}$ and $H^{+}$ concentration and send signals to respiratory rhythm centre.

BIOXI17: BREATHING AND EXCHANGE OF GASES

338791 Identify which of the following is incorrect?
i. Incase of forceful expiration, lungs become empty
ii. Exchange of gases in the lungs is interrupted during expiration.
iii. Chemosensitive area of respiratory centre in medulla is affected by excess ${CO}_{2}$ and $H^{+}$ ions
iv. Respiratory movements are controlled by ${CO}_{2}$ concentration of arterial blood

1 ii and iii only

2 i and ii only

3 i only

4 iii and iv only

BIOXI17: BREATHING AND EXCHANGE OF GASES

338787 Respiratory movements are controlled by

1 Cerebellum

2 Cerebrum

3 Medulla oblongata

4 Crura cerebri

Explanation:

The medulla oblongata basically detects carbon dioxide $({CO}_{2})$ and Oxygen $(O_{2})$ levels in the bloodstream and determines what changes need to happen in the body. It can then send nerve impulses to muscles in the heart and diaphragm.

BIOXI17: BREATHING AND EXCHANGE OF GASES

338788 Neural signal from which centre can reduce the duration of inspiration is (Inspiration inhibition)

1 Chemosensitive area

2 Respiratory rhythm centre

3 Receptors associated with aortic arch and carotid artery

4 Pneumotaxic centre

BIOXI17: BREATHING AND EXCHANGE OF GASES

338789 Assertion :
A chemosensitive area is situated adjacent to the rhythm centre which is highly sensitive to ${CO}_{2}$ and hydrogen ions.
Reason :
The role of oxygen in the regulated of respiratory rhythm is quite insignificant.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.

2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.

3 Assertion is correct but Reason is incorrect.

4 Both Assertion and Reason are incorrect

Explanation:

A chemosensitive area is situated adjacent to the rhythm centre. This is highly sensitive to ${CO}_{2}$ and hydrogen ions. Increase in these substances can activate this chemosensitive area. This; in turn; gives signal to the rhythm centre to make necessary adjustments in the respiratory process so that these substances can be eliminated. The role of oxygen in the regulation of respiratory rhythm is quite insignificant because there is no receptor for oxygen in carotid artery and aortic arch which sends information to respiratory rhythm centre for regulation of respiratory rhythm. There are receptors carbon dioxide and hydrogen ion in oxygen in carotid artery and aortic arch. As soon as they bind, signals are sent to respiratory rhythm centre to control the respiratory process. Therefore role of oxygen is controlling respiratory rhythm process insignificantly.

BIOXI17: BREATHING AND EXCHANGE OF GASES

338790 The respiratory process is regulated by respiratory rhythm centre present in medulla of the brain, which is?

1 Stimulated by lower

O_{2}

and

H^{+}

concentration in aortic arch

2 Stimulated by higher

{CO}_{2}

and higher

H^{+}

concentration.

3 Inhibited byhigher

O_{2}

and

H^{+}

concentration

4 Stimulated by lower

O_{2}

and

H^{+}

concentration in carotid artery

Explanation:

Respiratory rhythm centre is present in medulla region of brain. There is a chemosensitive area, adjacent to respiratory rhythm centre, it is sensitive to ${CO}_{2}$ and $H^{+}$ ions. Receptors associated with aortic arch and carotid artery also recognize changes in concentration of ${CO}_{2}$ and $H^{+}$ concentration and send signals to respiratory rhythm centre.

BIOXI17: BREATHING AND EXCHANGE OF GASES

338791 Identify which of the following is incorrect?
i. Incase of forceful expiration, lungs become empty
ii. Exchange of gases in the lungs is interrupted during expiration.
iii. Chemosensitive area of respiratory centre in medulla is affected by excess ${CO}_{2}$ and $H^{+}$ ions
iv. Respiratory movements are controlled by ${CO}_{2}$ concentration of arterial blood

1 ii and iii only

2 i and ii only

3 i only

4 iii and iv only

BIOXI17: BREATHING AND EXCHANGE OF GASES

338787 Respiratory movements are controlled by

1 Cerebellum

2 Cerebrum

3 Medulla oblongata

4 Crura cerebri

Explanation:

The medulla oblongata basically detects carbon dioxide $({CO}_{2})$ and Oxygen $(O_{2})$ levels in the bloodstream and determines what changes need to happen in the body. It can then send nerve impulses to muscles in the heart and diaphragm.

BIOXI17: BREATHING AND EXCHANGE OF GASES

338788 Neural signal from which centre can reduce the duration of inspiration is (Inspiration inhibition)

1 Chemosensitive area

2 Respiratory rhythm centre

3 Receptors associated with aortic arch and carotid artery

4 Pneumotaxic centre

BIOXI17: BREATHING AND EXCHANGE OF GASES

338789 Assertion :
A chemosensitive area is situated adjacent to the rhythm centre which is highly sensitive to ${CO}_{2}$ and hydrogen ions.
Reason :
The role of oxygen in the regulated of respiratory rhythm is quite insignificant.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.

2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.

3 Assertion is correct but Reason is incorrect.

4 Both Assertion and Reason are incorrect

Explanation:

A chemosensitive area is situated adjacent to the rhythm centre. This is highly sensitive to ${CO}_{2}$ and hydrogen ions. Increase in these substances can activate this chemosensitive area. This; in turn; gives signal to the rhythm centre to make necessary adjustments in the respiratory process so that these substances can be eliminated. The role of oxygen in the regulation of respiratory rhythm is quite insignificant because there is no receptor for oxygen in carotid artery and aortic arch which sends information to respiratory rhythm centre for regulation of respiratory rhythm. There are receptors carbon dioxide and hydrogen ion in oxygen in carotid artery and aortic arch. As soon as they bind, signals are sent to respiratory rhythm centre to control the respiratory process. Therefore role of oxygen is controlling respiratory rhythm process insignificantly.

BIOXI17: BREATHING AND EXCHANGE OF GASES

338790 The respiratory process is regulated by respiratory rhythm centre present in medulla of the brain, which is?

1 Stimulated by lower

O_{2}

and

H^{+}

concentration in aortic arch

2 Stimulated by higher

{CO}_{2}

and higher

H^{+}

concentration.

3 Inhibited byhigher

O_{2}

and

H^{+}

concentration

4 Stimulated by lower

O_{2}

and

H^{+}

concentration in carotid artery

Explanation:

Respiratory rhythm centre is present in medulla region of brain. There is a chemosensitive area, adjacent to respiratory rhythm centre, it is sensitive to ${CO}_{2}$ and $H^{+}$ ions. Receptors associated with aortic arch and carotid artery also recognize changes in concentration of ${CO}_{2}$ and $H^{+}$ concentration and send signals to respiratory rhythm centre.

BIOXI17: BREATHING AND EXCHANGE OF GASES

338791 Identify which of the following is incorrect?
i. Incase of forceful expiration, lungs become empty
ii. Exchange of gases in the lungs is interrupted during expiration.
iii. Chemosensitive area of respiratory centre in medulla is affected by excess ${CO}_{2}$ and $H^{+}$ ions
iv. Respiratory movements are controlled by ${CO}_{2}$ concentration of arterial blood

1 ii and iii only

2 i and ii only

3 i only

4 iii and iv only

BIOXI17: BREATHING AND EXCHANGE OF GASES

338787 Respiratory movements are controlled by

1 Cerebellum

2 Cerebrum

3 Medulla oblongata

4 Crura cerebri

Explanation:

The medulla oblongata basically detects carbon dioxide $({CO}_{2})$ and Oxygen $(O_{2})$ levels in the bloodstream and determines what changes need to happen in the body. It can then send nerve impulses to muscles in the heart and diaphragm.

BIOXI17: BREATHING AND EXCHANGE OF GASES

338788 Neural signal from which centre can reduce the duration of inspiration is (Inspiration inhibition)

1 Chemosensitive area

2 Respiratory rhythm centre

3 Receptors associated with aortic arch and carotid artery

4 Pneumotaxic centre

BIOXI17: BREATHING AND EXCHANGE OF GASES

338789 Assertion :
A chemosensitive area is situated adjacent to the rhythm centre which is highly sensitive to ${CO}_{2}$ and hydrogen ions.
Reason :
The role of oxygen in the regulated of respiratory rhythm is quite insignificant.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.

2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.

3 Assertion is correct but Reason is incorrect.

4 Both Assertion and Reason are incorrect

Explanation:

A chemosensitive area is situated adjacent to the rhythm centre. This is highly sensitive to ${CO}_{2}$ and hydrogen ions. Increase in these substances can activate this chemosensitive area. This; in turn; gives signal to the rhythm centre to make necessary adjustments in the respiratory process so that these substances can be eliminated. The role of oxygen in the regulation of respiratory rhythm is quite insignificant because there is no receptor for oxygen in carotid artery and aortic arch which sends information to respiratory rhythm centre for regulation of respiratory rhythm. There are receptors carbon dioxide and hydrogen ion in oxygen in carotid artery and aortic arch. As soon as they bind, signals are sent to respiratory rhythm centre to control the respiratory process. Therefore role of oxygen is controlling respiratory rhythm process insignificantly.

BIOXI17: BREATHING AND EXCHANGE OF GASES

338790 The respiratory process is regulated by respiratory rhythm centre present in medulla of the brain, which is?

1 Stimulated by lower

O_{2}

and

H^{+}

concentration in aortic arch

2 Stimulated by higher

{CO}_{2}

and higher

H^{+}

concentration.

3 Inhibited byhigher

O_{2}

and

H^{+}

concentration

4 Stimulated by lower

O_{2}

and

H^{+}

concentration in carotid artery

Explanation:

Respiratory rhythm centre is present in medulla region of brain. There is a chemosensitive area, adjacent to respiratory rhythm centre, it is sensitive to ${CO}_{2}$ and $H^{+}$ ions. Receptors associated with aortic arch and carotid artery also recognize changes in concentration of ${CO}_{2}$ and $H^{+}$ concentration and send signals to respiratory rhythm centre.

BIOXI17: BREATHING AND EXCHANGE OF GASES

338791 Identify which of the following is incorrect?
i. Incase of forceful expiration, lungs become empty
ii. Exchange of gases in the lungs is interrupted during expiration.
iii. Chemosensitive area of respiratory centre in medulla is affected by excess ${CO}_{2}$ and $H^{+}$ ions
iv. Respiratory movements are controlled by ${CO}_{2}$ concentration of arterial blood

1 ii and iii only

2 i and ii only

3 i only

4 iii and iv only