2 muscle fibres distributed throughout the heart walls
3 muscle fibres found only in the ventricle wall
4 nerve fibres distributed in ventricles
Explanation:
(c) The atrioventricular bundle ( $AV$ bundle), on entering the ventricles splits into right and left branches. These branches then enter the heart muscles. They branch extensively and are called Purkinje fibres. They conduct the cardiac impulse to the ventricular wall.
Body fluids and circulation
278338
Contraction of the ventricle in the heart begins by the command from
1 Purkinje fibres
2 chordae tendinae
3 AV node
4 SA node
Explanation:
(d) The SA node has the inherent power of generating a wave of contraction and controlling the heartbeat. Hence, it is known as the pacemaker.
NCERT Page-284 / N-199
Body fluids and circulation
278339
The first heart sound is
1 'LUB' sound produced at the end of systole.
2 'DUB' sound produced at the end of systole.
3 'LUB' sound produced at the beginning of systole.
4 'DUB' sound produced at the beginning of systole.
Explanation:
(c) Lub is the first heart sound, which is associated with the closure of the tricuspid and bicuspid valves at the beginning of systole.
NCERT Page-285 / N-200
Body fluids and circulation
278340
The heart sound 'dub' is produced when
1 tricuspid valve is opened.
2 mitral valve is opened.
3 mitral valve is closed.
4 semi-lunar valves at the base of aorta get closed.
Explanation:
(d) Lub is the first heart sound and dub is the second heart sound. Dub is associated with the closure of the semilunar valves at the beginning of diastole.
2 muscle fibres distributed throughout the heart walls
3 muscle fibres found only in the ventricle wall
4 nerve fibres distributed in ventricles
Explanation:
(c) The atrioventricular bundle ( $AV$ bundle), on entering the ventricles splits into right and left branches. These branches then enter the heart muscles. They branch extensively and are called Purkinje fibres. They conduct the cardiac impulse to the ventricular wall.
Body fluids and circulation
278338
Contraction of the ventricle in the heart begins by the command from
1 Purkinje fibres
2 chordae tendinae
3 AV node
4 SA node
Explanation:
(d) The SA node has the inherent power of generating a wave of contraction and controlling the heartbeat. Hence, it is known as the pacemaker.
NCERT Page-284 / N-199
Body fluids and circulation
278339
The first heart sound is
1 'LUB' sound produced at the end of systole.
2 'DUB' sound produced at the end of systole.
3 'LUB' sound produced at the beginning of systole.
4 'DUB' sound produced at the beginning of systole.
Explanation:
(c) Lub is the first heart sound, which is associated with the closure of the tricuspid and bicuspid valves at the beginning of systole.
NCERT Page-285 / N-200
Body fluids and circulation
278340
The heart sound 'dub' is produced when
1 tricuspid valve is opened.
2 mitral valve is opened.
3 mitral valve is closed.
4 semi-lunar valves at the base of aorta get closed.
Explanation:
(d) Lub is the first heart sound and dub is the second heart sound. Dub is associated with the closure of the semilunar valves at the beginning of diastole.
2 muscle fibres distributed throughout the heart walls
3 muscle fibres found only in the ventricle wall
4 nerve fibres distributed in ventricles
Explanation:
(c) The atrioventricular bundle ( $AV$ bundle), on entering the ventricles splits into right and left branches. These branches then enter the heart muscles. They branch extensively and are called Purkinje fibres. They conduct the cardiac impulse to the ventricular wall.
Body fluids and circulation
278338
Contraction of the ventricle in the heart begins by the command from
1 Purkinje fibres
2 chordae tendinae
3 AV node
4 SA node
Explanation:
(d) The SA node has the inherent power of generating a wave of contraction and controlling the heartbeat. Hence, it is known as the pacemaker.
NCERT Page-284 / N-199
Body fluids and circulation
278339
The first heart sound is
1 'LUB' sound produced at the end of systole.
2 'DUB' sound produced at the end of systole.
3 'LUB' sound produced at the beginning of systole.
4 'DUB' sound produced at the beginning of systole.
Explanation:
(c) Lub is the first heart sound, which is associated with the closure of the tricuspid and bicuspid valves at the beginning of systole.
NCERT Page-285 / N-200
Body fluids and circulation
278340
The heart sound 'dub' is produced when
1 tricuspid valve is opened.
2 mitral valve is opened.
3 mitral valve is closed.
4 semi-lunar valves at the base of aorta get closed.
Explanation:
(d) Lub is the first heart sound and dub is the second heart sound. Dub is associated with the closure of the semilunar valves at the beginning of diastole.
2 muscle fibres distributed throughout the heart walls
3 muscle fibres found only in the ventricle wall
4 nerve fibres distributed in ventricles
Explanation:
(c) The atrioventricular bundle ( $AV$ bundle), on entering the ventricles splits into right and left branches. These branches then enter the heart muscles. They branch extensively and are called Purkinje fibres. They conduct the cardiac impulse to the ventricular wall.
Body fluids and circulation
278338
Contraction of the ventricle in the heart begins by the command from
1 Purkinje fibres
2 chordae tendinae
3 AV node
4 SA node
Explanation:
(d) The SA node has the inherent power of generating a wave of contraction and controlling the heartbeat. Hence, it is known as the pacemaker.
NCERT Page-284 / N-199
Body fluids and circulation
278339
The first heart sound is
1 'LUB' sound produced at the end of systole.
2 'DUB' sound produced at the end of systole.
3 'LUB' sound produced at the beginning of systole.
4 'DUB' sound produced at the beginning of systole.
Explanation:
(c) Lub is the first heart sound, which is associated with the closure of the tricuspid and bicuspid valves at the beginning of systole.
NCERT Page-285 / N-200
Body fluids and circulation
278340
The heart sound 'dub' is produced when
1 tricuspid valve is opened.
2 mitral valve is opened.
3 mitral valve is closed.
4 semi-lunar valves at the base of aorta get closed.
Explanation:
(d) Lub is the first heart sound and dub is the second heart sound. Dub is associated with the closure of the semilunar valves at the beginning of diastole.
