286081
External gills, tracheae, and lungs all share which of the following sets of characteristics?
1 Part of gas-exchange system, exchange both$\text{C}{{\text{O}}_{2}}$ and ${{\text{O}}_{2}}$; increase surface area for diffusion.
2 Used by water breathers; based on countercurrent exchange; use negative pressure breathing.
3 Exchange only${{\text{O}}_{2}}$; are associated with a circulatory system; found in vertebrates.
4 Found in insects; employ positive-pressure pumping based on crosscurrent flow.
Explanation:
(a) The external gill, tracheae, and lungs are all examples of gas-exchange systems used by various animals to exchange both $\text{C}{{\text{O}}_{2}}$ and ${{\text{O}}_{2}}$. One of the special properties of all respiratory systems is that they increase surface area for diffusion.
NCERT Page-268 / N-183
BREATHING and EXCHANGE OF GASES(NCERT)
286083
Membrane separating air in pulmonary alveoli from blood capillaries is
1 alveolar epithelium
2 cardiac epithelium
3 endothelium of blood capillaries
4 both (a) and (c)
Explanation:
(d) Alveolar epithelium and endothelium of blood capillaries are two membranes which separate air in pulmonary alveoli from blood capillaries.
NCERT Page-273 / N-188
BREATHING and EXCHANGE OF GASES(NCERT)
286084
Select the correct option regarding $\text{C}{{\text{O}}_{2}}$ concentration.
1 It is higher in alveolar air than in deoxygenated blood.
2 It is higher in oxygenated blood than in alveolar air.
3 It is higher in deoxygenated blood than in alveolar air.
4 It is higher in inspired air than in oxygenated blood.
Explanation:
(c) Partial pressure of $\text{C}{{\text{O}}_{2}}$ in alveolar air is $40\text{mmHg}$, that in deoxygenated blood is $45\text{mmHg}$ and that in oxygenated blood is $40\text{mmHg}$.
NCERT Page-272 / N-187
BREATHING and EXCHANGE OF GASES(NCERT)
286085
Which of the following would have the same ${{\text{O}}_{2}}$ content? $\text{ }\!\!~\!\!\text{ }$
1 Blood entering the lungs and blood leaving the lungs
2 Blood entering the right side of the heart and blood leaving the right side of the heart
3 Blood entering the right side of the heart and blood leaving the left side of the heart
4 Blood entering the tissue capillaries and blood leaving the tissue capillaries
Explanation:
(b) Blood entering the right side of the heart and blood leaving the right side of the heart.
NCERT Page-272 & 273 / N-187
BREATHING and EXCHANGE OF GASES(NCERT)
286086
The movement of ${{\text{O}}_{2}}$ and $\text{C}{{\text{O}}_{2}}$ between the blood in the tissue capillaries and the cells in tissues depends most directly upon:
1 active transport of${{\text{O}}_{2}}$ and $\text{C}{{\text{O}}_{2}}$.
2 total atmospheric (barometric) pressure differences across the cell membranes.
3 diffusion of${{\text{O}}_{2}}$ and $\text{C}{{\text{O}}_{2}}$ down a concentration gradient.
4 diffusion of${{\text{O}}_{2}}$ and $\text{C}{{\text{O}}_{2}}$ down a partial pressure gradient.
Explanation:
(d) Movement of ${{\text{O}}_{2}}$ and $\text{C}{{\text{O}}_{2}}$ from the blood to the tissues always occurs by diffusion of ${{\text{O}}_{2}}$ and $\text{C}{{\text{O}}_{2}}$ down their partial pressure gradients.
286081
External gills, tracheae, and lungs all share which of the following sets of characteristics?
1 Part of gas-exchange system, exchange both$\text{C}{{\text{O}}_{2}}$ and ${{\text{O}}_{2}}$; increase surface area for diffusion.
2 Used by water breathers; based on countercurrent exchange; use negative pressure breathing.
3 Exchange only${{\text{O}}_{2}}$; are associated with a circulatory system; found in vertebrates.
4 Found in insects; employ positive-pressure pumping based on crosscurrent flow.
Explanation:
(a) The external gill, tracheae, and lungs are all examples of gas-exchange systems used by various animals to exchange both $\text{C}{{\text{O}}_{2}}$ and ${{\text{O}}_{2}}$. One of the special properties of all respiratory systems is that they increase surface area for diffusion.
NCERT Page-268 / N-183
BREATHING and EXCHANGE OF GASES(NCERT)
286083
Membrane separating air in pulmonary alveoli from blood capillaries is
1 alveolar epithelium
2 cardiac epithelium
3 endothelium of blood capillaries
4 both (a) and (c)
Explanation:
(d) Alveolar epithelium and endothelium of blood capillaries are two membranes which separate air in pulmonary alveoli from blood capillaries.
NCERT Page-273 / N-188
BREATHING and EXCHANGE OF GASES(NCERT)
286084
Select the correct option regarding $\text{C}{{\text{O}}_{2}}$ concentration.
1 It is higher in alveolar air than in deoxygenated blood.
2 It is higher in oxygenated blood than in alveolar air.
3 It is higher in deoxygenated blood than in alveolar air.
4 It is higher in inspired air than in oxygenated blood.
Explanation:
(c) Partial pressure of $\text{C}{{\text{O}}_{2}}$ in alveolar air is $40\text{mmHg}$, that in deoxygenated blood is $45\text{mmHg}$ and that in oxygenated blood is $40\text{mmHg}$.
NCERT Page-272 / N-187
BREATHING and EXCHANGE OF GASES(NCERT)
286085
Which of the following would have the same ${{\text{O}}_{2}}$ content? $\text{ }\!\!~\!\!\text{ }$
1 Blood entering the lungs and blood leaving the lungs
2 Blood entering the right side of the heart and blood leaving the right side of the heart
3 Blood entering the right side of the heart and blood leaving the left side of the heart
4 Blood entering the tissue capillaries and blood leaving the tissue capillaries
Explanation:
(b) Blood entering the right side of the heart and blood leaving the right side of the heart.
NCERT Page-272 & 273 / N-187
BREATHING and EXCHANGE OF GASES(NCERT)
286086
The movement of ${{\text{O}}_{2}}$ and $\text{C}{{\text{O}}_{2}}$ between the blood in the tissue capillaries and the cells in tissues depends most directly upon:
1 active transport of${{\text{O}}_{2}}$ and $\text{C}{{\text{O}}_{2}}$.
2 total atmospheric (barometric) pressure differences across the cell membranes.
3 diffusion of${{\text{O}}_{2}}$ and $\text{C}{{\text{O}}_{2}}$ down a concentration gradient.
4 diffusion of${{\text{O}}_{2}}$ and $\text{C}{{\text{O}}_{2}}$ down a partial pressure gradient.
Explanation:
(d) Movement of ${{\text{O}}_{2}}$ and $\text{C}{{\text{O}}_{2}}$ from the blood to the tissues always occurs by diffusion of ${{\text{O}}_{2}}$ and $\text{C}{{\text{O}}_{2}}$ down their partial pressure gradients.
286081
External gills, tracheae, and lungs all share which of the following sets of characteristics?
1 Part of gas-exchange system, exchange both$\text{C}{{\text{O}}_{2}}$ and ${{\text{O}}_{2}}$; increase surface area for diffusion.
2 Used by water breathers; based on countercurrent exchange; use negative pressure breathing.
3 Exchange only${{\text{O}}_{2}}$; are associated with a circulatory system; found in vertebrates.
4 Found in insects; employ positive-pressure pumping based on crosscurrent flow.
Explanation:
(a) The external gill, tracheae, and lungs are all examples of gas-exchange systems used by various animals to exchange both $\text{C}{{\text{O}}_{2}}$ and ${{\text{O}}_{2}}$. One of the special properties of all respiratory systems is that they increase surface area for diffusion.
NCERT Page-268 / N-183
BREATHING and EXCHANGE OF GASES(NCERT)
286083
Membrane separating air in pulmonary alveoli from blood capillaries is
1 alveolar epithelium
2 cardiac epithelium
3 endothelium of blood capillaries
4 both (a) and (c)
Explanation:
(d) Alveolar epithelium and endothelium of blood capillaries are two membranes which separate air in pulmonary alveoli from blood capillaries.
NCERT Page-273 / N-188
BREATHING and EXCHANGE OF GASES(NCERT)
286084
Select the correct option regarding $\text{C}{{\text{O}}_{2}}$ concentration.
1 It is higher in alveolar air than in deoxygenated blood.
2 It is higher in oxygenated blood than in alveolar air.
3 It is higher in deoxygenated blood than in alveolar air.
4 It is higher in inspired air than in oxygenated blood.
Explanation:
(c) Partial pressure of $\text{C}{{\text{O}}_{2}}$ in alveolar air is $40\text{mmHg}$, that in deoxygenated blood is $45\text{mmHg}$ and that in oxygenated blood is $40\text{mmHg}$.
NCERT Page-272 / N-187
BREATHING and EXCHANGE OF GASES(NCERT)
286085
Which of the following would have the same ${{\text{O}}_{2}}$ content? $\text{ }\!\!~\!\!\text{ }$
1 Blood entering the lungs and blood leaving the lungs
2 Blood entering the right side of the heart and blood leaving the right side of the heart
3 Blood entering the right side of the heart and blood leaving the left side of the heart
4 Blood entering the tissue capillaries and blood leaving the tissue capillaries
Explanation:
(b) Blood entering the right side of the heart and blood leaving the right side of the heart.
NCERT Page-272 & 273 / N-187
BREATHING and EXCHANGE OF GASES(NCERT)
286086
The movement of ${{\text{O}}_{2}}$ and $\text{C}{{\text{O}}_{2}}$ between the blood in the tissue capillaries and the cells in tissues depends most directly upon:
1 active transport of${{\text{O}}_{2}}$ and $\text{C}{{\text{O}}_{2}}$.
2 total atmospheric (barometric) pressure differences across the cell membranes.
3 diffusion of${{\text{O}}_{2}}$ and $\text{C}{{\text{O}}_{2}}$ down a concentration gradient.
4 diffusion of${{\text{O}}_{2}}$ and $\text{C}{{\text{O}}_{2}}$ down a partial pressure gradient.
Explanation:
(d) Movement of ${{\text{O}}_{2}}$ and $\text{C}{{\text{O}}_{2}}$ from the blood to the tissues always occurs by diffusion of ${{\text{O}}_{2}}$ and $\text{C}{{\text{O}}_{2}}$ down their partial pressure gradients.
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BREATHING and EXCHANGE OF GASES(NCERT)
286081
External gills, tracheae, and lungs all share which of the following sets of characteristics?
1 Part of gas-exchange system, exchange both$\text{C}{{\text{O}}_{2}}$ and ${{\text{O}}_{2}}$; increase surface area for diffusion.
2 Used by water breathers; based on countercurrent exchange; use negative pressure breathing.
3 Exchange only${{\text{O}}_{2}}$; are associated with a circulatory system; found in vertebrates.
4 Found in insects; employ positive-pressure pumping based on crosscurrent flow.
Explanation:
(a) The external gill, tracheae, and lungs are all examples of gas-exchange systems used by various animals to exchange both $\text{C}{{\text{O}}_{2}}$ and ${{\text{O}}_{2}}$. One of the special properties of all respiratory systems is that they increase surface area for diffusion.
NCERT Page-268 / N-183
BREATHING and EXCHANGE OF GASES(NCERT)
286083
Membrane separating air in pulmonary alveoli from blood capillaries is
1 alveolar epithelium
2 cardiac epithelium
3 endothelium of blood capillaries
4 both (a) and (c)
Explanation:
(d) Alveolar epithelium and endothelium of blood capillaries are two membranes which separate air in pulmonary alveoli from blood capillaries.
NCERT Page-273 / N-188
BREATHING and EXCHANGE OF GASES(NCERT)
286084
Select the correct option regarding $\text{C}{{\text{O}}_{2}}$ concentration.
1 It is higher in alveolar air than in deoxygenated blood.
2 It is higher in oxygenated blood than in alveolar air.
3 It is higher in deoxygenated blood than in alveolar air.
4 It is higher in inspired air than in oxygenated blood.
Explanation:
(c) Partial pressure of $\text{C}{{\text{O}}_{2}}$ in alveolar air is $40\text{mmHg}$, that in deoxygenated blood is $45\text{mmHg}$ and that in oxygenated blood is $40\text{mmHg}$.
NCERT Page-272 / N-187
BREATHING and EXCHANGE OF GASES(NCERT)
286085
Which of the following would have the same ${{\text{O}}_{2}}$ content? $\text{ }\!\!~\!\!\text{ }$
1 Blood entering the lungs and blood leaving the lungs
2 Blood entering the right side of the heart and blood leaving the right side of the heart
3 Blood entering the right side of the heart and blood leaving the left side of the heart
4 Blood entering the tissue capillaries and blood leaving the tissue capillaries
Explanation:
(b) Blood entering the right side of the heart and blood leaving the right side of the heart.
NCERT Page-272 & 273 / N-187
BREATHING and EXCHANGE OF GASES(NCERT)
286086
The movement of ${{\text{O}}_{2}}$ and $\text{C}{{\text{O}}_{2}}$ between the blood in the tissue capillaries and the cells in tissues depends most directly upon:
1 active transport of${{\text{O}}_{2}}$ and $\text{C}{{\text{O}}_{2}}$.
2 total atmospheric (barometric) pressure differences across the cell membranes.
3 diffusion of${{\text{O}}_{2}}$ and $\text{C}{{\text{O}}_{2}}$ down a concentration gradient.
4 diffusion of${{\text{O}}_{2}}$ and $\text{C}{{\text{O}}_{2}}$ down a partial pressure gradient.
Explanation:
(d) Movement of ${{\text{O}}_{2}}$ and $\text{C}{{\text{O}}_{2}}$ from the blood to the tissues always occurs by diffusion of ${{\text{O}}_{2}}$ and $\text{C}{{\text{O}}_{2}}$ down their partial pressure gradients.
286081
External gills, tracheae, and lungs all share which of the following sets of characteristics?
1 Part of gas-exchange system, exchange both$\text{C}{{\text{O}}_{2}}$ and ${{\text{O}}_{2}}$; increase surface area for diffusion.
2 Used by water breathers; based on countercurrent exchange; use negative pressure breathing.
3 Exchange only${{\text{O}}_{2}}$; are associated with a circulatory system; found in vertebrates.
4 Found in insects; employ positive-pressure pumping based on crosscurrent flow.
Explanation:
(a) The external gill, tracheae, and lungs are all examples of gas-exchange systems used by various animals to exchange both $\text{C}{{\text{O}}_{2}}$ and ${{\text{O}}_{2}}$. One of the special properties of all respiratory systems is that they increase surface area for diffusion.
NCERT Page-268 / N-183
BREATHING and EXCHANGE OF GASES(NCERT)
286083
Membrane separating air in pulmonary alveoli from blood capillaries is
1 alveolar epithelium
2 cardiac epithelium
3 endothelium of blood capillaries
4 both (a) and (c)
Explanation:
(d) Alveolar epithelium and endothelium of blood capillaries are two membranes which separate air in pulmonary alveoli from blood capillaries.
NCERT Page-273 / N-188
BREATHING and EXCHANGE OF GASES(NCERT)
286084
Select the correct option regarding $\text{C}{{\text{O}}_{2}}$ concentration.
1 It is higher in alveolar air than in deoxygenated blood.
2 It is higher in oxygenated blood than in alveolar air.
3 It is higher in deoxygenated blood than in alveolar air.
4 It is higher in inspired air than in oxygenated blood.
Explanation:
(c) Partial pressure of $\text{C}{{\text{O}}_{2}}$ in alveolar air is $40\text{mmHg}$, that in deoxygenated blood is $45\text{mmHg}$ and that in oxygenated blood is $40\text{mmHg}$.
NCERT Page-272 / N-187
BREATHING and EXCHANGE OF GASES(NCERT)
286085
Which of the following would have the same ${{\text{O}}_{2}}$ content? $\text{ }\!\!~\!\!\text{ }$
1 Blood entering the lungs and blood leaving the lungs
2 Blood entering the right side of the heart and blood leaving the right side of the heart
3 Blood entering the right side of the heart and blood leaving the left side of the heart
4 Blood entering the tissue capillaries and blood leaving the tissue capillaries
Explanation:
(b) Blood entering the right side of the heart and blood leaving the right side of the heart.
NCERT Page-272 & 273 / N-187
BREATHING and EXCHANGE OF GASES(NCERT)
286086
The movement of ${{\text{O}}_{2}}$ and $\text{C}{{\text{O}}_{2}}$ between the blood in the tissue capillaries and the cells in tissues depends most directly upon:
1 active transport of${{\text{O}}_{2}}$ and $\text{C}{{\text{O}}_{2}}$.
2 total atmospheric (barometric) pressure differences across the cell membranes.
3 diffusion of${{\text{O}}_{2}}$ and $\text{C}{{\text{O}}_{2}}$ down a concentration gradient.
4 diffusion of${{\text{O}}_{2}}$ and $\text{C}{{\text{O}}_{2}}$ down a partial pressure gradient.
Explanation:
(d) Movement of ${{\text{O}}_{2}}$ and $\text{C}{{\text{O}}_{2}}$ from the blood to the tissues always occurs by diffusion of ${{\text{O}}_{2}}$ and $\text{C}{{\text{O}}_{2}}$ down their partial pressure gradients.