285979
" $X$ " is a fibrous tissue of the membranous septum of the heart just above the septal cusp of the tricuspid valve. It separates the atrium and the ventricle of the same side. Identify " $X$ ".
1 Sino atrial node
2 Atrioventricular septum
3 Atrioventricular node
4 Interventricular septum
Explanation:
(b) The atrioventricular septum is a septum of the heart between the right atrium (RA) and the left ventricle. It is a small part of the membranous septum of the heart just above the septal cusp of the tricuspid valve.
NCERT Page-283 / N-198
BODY FLUIDS and CIRCULATION(NCERT)
285980
Given below is the ECG of a normal human.
Which one of its components is correctly interpreted?
1 Peak$P$ and Peak $R$ together - Systolic and diastolic blood pressures
2 Peak P - Initiation of left atrial contraction only
3 Complex QRS - One complete pulse
4 Peak T - Initiation of total cardiac contraction
Explanation:
(c) ECG (Electrocardiogram) is a graphic sketching of the variations in electrical potential caused by the excitation of the heart muscle and detected at the body surface. The normal ECG is a scalar representation that shows deflections resulting from cardiac activity. It comprises the P wave, QRS complex, T wave and U wave.
QRS complex: It represents the depolarization of the ventricles which initiates the ventricular contraction. The contraction starts shortly after $Q$ and marks the beginning of the systole. Hence QRS complex shows one complete pulse.
NCERT Page-286 / N-201
BODY FLUIDS and CIRCULATION(NCERT)
285981
Given below are four statements (i-iv) regarding human blood circulatory system. Choose the correct statement.
1 Arteries are thick-walled and have narrow lumen as compared to veins.
2 Angina is acute chest pain when the blood circulation to the brain is reduced.
3 Persons with blood group$AB$ can donate blood to any person with any blood group under $ABO$ system.
4 Calcium ions has no role in blood clotting:
Explanation:
(a) Angina is an acute chest pain due to oxygen deficiency to heart muscles. It occurs due to improper blood flow. Persons with AB group are called Universal recipients because they can accept blood from all groups. Persons with O Group are called Universal donors because they can donate blood to persons with any other blood group. Calcium ions play a very important role in blood clotting.
NCERT Page-286 / N-201
BODY FLUIDS and CIRCULATION(NCERT)
285982
In ECG, P-R interval corresponds to
1 time delay in AV-node
2 S-A nodal conduction time
3 increased ventricular contraction
4 time interval between onset of ventricular contraction.
Explanation:
(a) In ECG, P-R interval corresponds to the time delay in AV node.
285979
" $X$ " is a fibrous tissue of the membranous septum of the heart just above the septal cusp of the tricuspid valve. It separates the atrium and the ventricle of the same side. Identify " $X$ ".
1 Sino atrial node
2 Atrioventricular septum
3 Atrioventricular node
4 Interventricular septum
Explanation:
(b) The atrioventricular septum is a septum of the heart between the right atrium (RA) and the left ventricle. It is a small part of the membranous septum of the heart just above the septal cusp of the tricuspid valve.
NCERT Page-283 / N-198
BODY FLUIDS and CIRCULATION(NCERT)
285980
Given below is the ECG of a normal human.
Which one of its components is correctly interpreted?
1 Peak$P$ and Peak $R$ together - Systolic and diastolic blood pressures
2 Peak P - Initiation of left atrial contraction only
3 Complex QRS - One complete pulse
4 Peak T - Initiation of total cardiac contraction
Explanation:
(c) ECG (Electrocardiogram) is a graphic sketching of the variations in electrical potential caused by the excitation of the heart muscle and detected at the body surface. The normal ECG is a scalar representation that shows deflections resulting from cardiac activity. It comprises the P wave, QRS complex, T wave and U wave.
QRS complex: It represents the depolarization of the ventricles which initiates the ventricular contraction. The contraction starts shortly after $Q$ and marks the beginning of the systole. Hence QRS complex shows one complete pulse.
NCERT Page-286 / N-201
BODY FLUIDS and CIRCULATION(NCERT)
285981
Given below are four statements (i-iv) regarding human blood circulatory system. Choose the correct statement.
1 Arteries are thick-walled and have narrow lumen as compared to veins.
2 Angina is acute chest pain when the blood circulation to the brain is reduced.
3 Persons with blood group$AB$ can donate blood to any person with any blood group under $ABO$ system.
4 Calcium ions has no role in blood clotting:
Explanation:
(a) Angina is an acute chest pain due to oxygen deficiency to heart muscles. It occurs due to improper blood flow. Persons with AB group are called Universal recipients because they can accept blood from all groups. Persons with O Group are called Universal donors because they can donate blood to persons with any other blood group. Calcium ions play a very important role in blood clotting.
NCERT Page-286 / N-201
BODY FLUIDS and CIRCULATION(NCERT)
285982
In ECG, P-R interval corresponds to
1 time delay in AV-node
2 S-A nodal conduction time
3 increased ventricular contraction
4 time interval between onset of ventricular contraction.
Explanation:
(a) In ECG, P-R interval corresponds to the time delay in AV node.
285979
" $X$ " is a fibrous tissue of the membranous septum of the heart just above the septal cusp of the tricuspid valve. It separates the atrium and the ventricle of the same side. Identify " $X$ ".
1 Sino atrial node
2 Atrioventricular septum
3 Atrioventricular node
4 Interventricular septum
Explanation:
(b) The atrioventricular septum is a septum of the heart between the right atrium (RA) and the left ventricle. It is a small part of the membranous septum of the heart just above the septal cusp of the tricuspid valve.
NCERT Page-283 / N-198
BODY FLUIDS and CIRCULATION(NCERT)
285980
Given below is the ECG of a normal human.
Which one of its components is correctly interpreted?
1 Peak$P$ and Peak $R$ together - Systolic and diastolic blood pressures
2 Peak P - Initiation of left atrial contraction only
3 Complex QRS - One complete pulse
4 Peak T - Initiation of total cardiac contraction
Explanation:
(c) ECG (Electrocardiogram) is a graphic sketching of the variations in electrical potential caused by the excitation of the heart muscle and detected at the body surface. The normal ECG is a scalar representation that shows deflections resulting from cardiac activity. It comprises the P wave, QRS complex, T wave and U wave.
QRS complex: It represents the depolarization of the ventricles which initiates the ventricular contraction. The contraction starts shortly after $Q$ and marks the beginning of the systole. Hence QRS complex shows one complete pulse.
NCERT Page-286 / N-201
BODY FLUIDS and CIRCULATION(NCERT)
285981
Given below are four statements (i-iv) regarding human blood circulatory system. Choose the correct statement.
1 Arteries are thick-walled and have narrow lumen as compared to veins.
2 Angina is acute chest pain when the blood circulation to the brain is reduced.
3 Persons with blood group$AB$ can donate blood to any person with any blood group under $ABO$ system.
4 Calcium ions has no role in blood clotting:
Explanation:
(a) Angina is an acute chest pain due to oxygen deficiency to heart muscles. It occurs due to improper blood flow. Persons with AB group are called Universal recipients because they can accept blood from all groups. Persons with O Group are called Universal donors because they can donate blood to persons with any other blood group. Calcium ions play a very important role in blood clotting.
NCERT Page-286 / N-201
BODY FLUIDS and CIRCULATION(NCERT)
285982
In ECG, P-R interval corresponds to
1 time delay in AV-node
2 S-A nodal conduction time
3 increased ventricular contraction
4 time interval between onset of ventricular contraction.
Explanation:
(a) In ECG, P-R interval corresponds to the time delay in AV node.
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BODY FLUIDS and CIRCULATION(NCERT)
285979
" $X$ " is a fibrous tissue of the membranous septum of the heart just above the septal cusp of the tricuspid valve. It separates the atrium and the ventricle of the same side. Identify " $X$ ".
1 Sino atrial node
2 Atrioventricular septum
3 Atrioventricular node
4 Interventricular septum
Explanation:
(b) The atrioventricular septum is a septum of the heart between the right atrium (RA) and the left ventricle. It is a small part of the membranous septum of the heart just above the septal cusp of the tricuspid valve.
NCERT Page-283 / N-198
BODY FLUIDS and CIRCULATION(NCERT)
285980
Given below is the ECG of a normal human.
Which one of its components is correctly interpreted?
1 Peak$P$ and Peak $R$ together - Systolic and diastolic blood pressures
2 Peak P - Initiation of left atrial contraction only
3 Complex QRS - One complete pulse
4 Peak T - Initiation of total cardiac contraction
Explanation:
(c) ECG (Electrocardiogram) is a graphic sketching of the variations in electrical potential caused by the excitation of the heart muscle and detected at the body surface. The normal ECG is a scalar representation that shows deflections resulting from cardiac activity. It comprises the P wave, QRS complex, T wave and U wave.
QRS complex: It represents the depolarization of the ventricles which initiates the ventricular contraction. The contraction starts shortly after $Q$ and marks the beginning of the systole. Hence QRS complex shows one complete pulse.
NCERT Page-286 / N-201
BODY FLUIDS and CIRCULATION(NCERT)
285981
Given below are four statements (i-iv) regarding human blood circulatory system. Choose the correct statement.
1 Arteries are thick-walled and have narrow lumen as compared to veins.
2 Angina is acute chest pain when the blood circulation to the brain is reduced.
3 Persons with blood group$AB$ can donate blood to any person with any blood group under $ABO$ system.
4 Calcium ions has no role in blood clotting:
Explanation:
(a) Angina is an acute chest pain due to oxygen deficiency to heart muscles. It occurs due to improper blood flow. Persons with AB group are called Universal recipients because they can accept blood from all groups. Persons with O Group are called Universal donors because they can donate blood to persons with any other blood group. Calcium ions play a very important role in blood clotting.
NCERT Page-286 / N-201
BODY FLUIDS and CIRCULATION(NCERT)
285982
In ECG, P-R interval corresponds to
1 time delay in AV-node
2 S-A nodal conduction time
3 increased ventricular contraction
4 time interval between onset of ventricular contraction.
Explanation:
(a) In ECG, P-R interval corresponds to the time delay in AV node.
