285966
Which of the following statements is correct regarding joint diastole?
1 Both atria relax but ventricles contract.
2 Both ventricles relax but atria contract.
3 Both semilunar valves are open.
4 Tricuspid and bicuspid valves are open.
Explanation:
(d) In joint diastole, all chambers of the heart are in relaxed state. When the tricuspid and bicuspid valves open, blood from pulmonary vein and vena cava flows into left and right ventricles respectively through left and right atria.
Note: Semilunar valves are closed at this stage.
NCERT Page-285 / N-200
BODY FLUIDS and CIRCULATION(NCERT)
285967
Closure of which of the following valves makes louder sound of heart beat?
1 Mitral valve
2 Seminular valve
3 Auriculo-ventricular valve
4 Tricuspid valve
Explanation:
(c) Closure of $AV$ valve makes the louder sound of heart beat.
NCERT Page-285 / N-200
BODY FLUIDS and CIRCULATION(NCERT)
285968
Mitral valve is present between]#
1 right atrium and right ventricle
2 left atrium and left ventricle
3 right and left ventricle
4 left ventricle and aorta.
Explanation:
(b) Mitral valve or Bicuspid valve is present between left atrium and left ventricle. This valve allows unidirectional flow of blood from atrium to ventricle. Mitral valve is present on left auriculo-ventricular aperture.
BODY FLUIDS and CIRCULATION(NCERT)
285969
What happens when the pacemaker becomes nonfunctional?
1 Only the auricles will contract rhythmically.
2 The cardiac muslces do not contract in a coordinated manner rhythmically.
3 Only ventricles will contract rhythmically.
4 Auricles and ventricles contract simultaneously.
Explanation:
(b) SAN (called pacemaker) initiates and maintains contraction of heart by generating action potentials $\left( 70-75/\text{min} \right)$. When pacemaker is non-functional, the cardiac muscles do not contract in a coordinated manner.
285966
Which of the following statements is correct regarding joint diastole?
1 Both atria relax but ventricles contract.
2 Both ventricles relax but atria contract.
3 Both semilunar valves are open.
4 Tricuspid and bicuspid valves are open.
Explanation:
(d) In joint diastole, all chambers of the heart are in relaxed state. When the tricuspid and bicuspid valves open, blood from pulmonary vein and vena cava flows into left and right ventricles respectively through left and right atria.
Note: Semilunar valves are closed at this stage.
NCERT Page-285 / N-200
BODY FLUIDS and CIRCULATION(NCERT)
285967
Closure of which of the following valves makes louder sound of heart beat?
1 Mitral valve
2 Seminular valve
3 Auriculo-ventricular valve
4 Tricuspid valve
Explanation:
(c) Closure of $AV$ valve makes the louder sound of heart beat.
NCERT Page-285 / N-200
BODY FLUIDS and CIRCULATION(NCERT)
285968
Mitral valve is present between]#
1 right atrium and right ventricle
2 left atrium and left ventricle
3 right and left ventricle
4 left ventricle and aorta.
Explanation:
(b) Mitral valve or Bicuspid valve is present between left atrium and left ventricle. This valve allows unidirectional flow of blood from atrium to ventricle. Mitral valve is present on left auriculo-ventricular aperture.
BODY FLUIDS and CIRCULATION(NCERT)
285969
What happens when the pacemaker becomes nonfunctional?
1 Only the auricles will contract rhythmically.
2 The cardiac muslces do not contract in a coordinated manner rhythmically.
3 Only ventricles will contract rhythmically.
4 Auricles and ventricles contract simultaneously.
Explanation:
(b) SAN (called pacemaker) initiates and maintains contraction of heart by generating action potentials $\left( 70-75/\text{min} \right)$. When pacemaker is non-functional, the cardiac muscles do not contract in a coordinated manner.
285966
Which of the following statements is correct regarding joint diastole?
1 Both atria relax but ventricles contract.
2 Both ventricles relax but atria contract.
3 Both semilunar valves are open.
4 Tricuspid and bicuspid valves are open.
Explanation:
(d) In joint diastole, all chambers of the heart are in relaxed state. When the tricuspid and bicuspid valves open, blood from pulmonary vein and vena cava flows into left and right ventricles respectively through left and right atria.
Note: Semilunar valves are closed at this stage.
NCERT Page-285 / N-200
BODY FLUIDS and CIRCULATION(NCERT)
285967
Closure of which of the following valves makes louder sound of heart beat?
1 Mitral valve
2 Seminular valve
3 Auriculo-ventricular valve
4 Tricuspid valve
Explanation:
(c) Closure of $AV$ valve makes the louder sound of heart beat.
NCERT Page-285 / N-200
BODY FLUIDS and CIRCULATION(NCERT)
285968
Mitral valve is present between]#
1 right atrium and right ventricle
2 left atrium and left ventricle
3 right and left ventricle
4 left ventricle and aorta.
Explanation:
(b) Mitral valve or Bicuspid valve is present between left atrium and left ventricle. This valve allows unidirectional flow of blood from atrium to ventricle. Mitral valve is present on left auriculo-ventricular aperture.
BODY FLUIDS and CIRCULATION(NCERT)
285969
What happens when the pacemaker becomes nonfunctional?
1 Only the auricles will contract rhythmically.
2 The cardiac muslces do not contract in a coordinated manner rhythmically.
3 Only ventricles will contract rhythmically.
4 Auricles and ventricles contract simultaneously.
Explanation:
(b) SAN (called pacemaker) initiates and maintains contraction of heart by generating action potentials $\left( 70-75/\text{min} \right)$. When pacemaker is non-functional, the cardiac muscles do not contract in a coordinated manner.
285966
Which of the following statements is correct regarding joint diastole?
1 Both atria relax but ventricles contract.
2 Both ventricles relax but atria contract.
3 Both semilunar valves are open.
4 Tricuspid and bicuspid valves are open.
Explanation:
(d) In joint diastole, all chambers of the heart are in relaxed state. When the tricuspid and bicuspid valves open, blood from pulmonary vein and vena cava flows into left and right ventricles respectively through left and right atria.
Note: Semilunar valves are closed at this stage.
NCERT Page-285 / N-200
BODY FLUIDS and CIRCULATION(NCERT)
285967
Closure of which of the following valves makes louder sound of heart beat?
1 Mitral valve
2 Seminular valve
3 Auriculo-ventricular valve
4 Tricuspid valve
Explanation:
(c) Closure of $AV$ valve makes the louder sound of heart beat.
NCERT Page-285 / N-200
BODY FLUIDS and CIRCULATION(NCERT)
285968
Mitral valve is present between]#
1 right atrium and right ventricle
2 left atrium and left ventricle
3 right and left ventricle
4 left ventricle and aorta.
Explanation:
(b) Mitral valve or Bicuspid valve is present between left atrium and left ventricle. This valve allows unidirectional flow of blood from atrium to ventricle. Mitral valve is present on left auriculo-ventricular aperture.
BODY FLUIDS and CIRCULATION(NCERT)
285969
What happens when the pacemaker becomes nonfunctional?
1 Only the auricles will contract rhythmically.
2 The cardiac muslces do not contract in a coordinated manner rhythmically.
3 Only ventricles will contract rhythmically.
4 Auricles and ventricles contract simultaneously.
Explanation:
(b) SAN (called pacemaker) initiates and maintains contraction of heart by generating action potentials $\left( 70-75/\text{min} \right)$. When pacemaker is non-functional, the cardiac muscles do not contract in a coordinated manner.
