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(NCERT)
285947
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.
NCERT Page-285 / N-200
BODY FLUIDS and CIRCULATION(NCERT)
285948
What is the function of valve?
1 To prevent blood from flowing into the aorta.
2 To push blood into the ventricle.
3 To push blood into the aorta.
4 To prevent backflow of blood into the left ventricle.
Explanation:
(d) Valves of heart maintain unidirectional flow of blood (i.e from the atria to the ventricles and from the ventricles to the pulmonary artery or aorta) and opening and closing of valve depends upon the pressure on opposite sides. It prevents its regurgitation in the opposite direction. These valves act like one way doors and allows blood to flow either forward into the next chamber or out of the heart via one of two main blood vessels that carry blood away from the heart. The valves close to prevent the back flow. The heart has 4 valves: mitral valve and tricuspid valve (which control blood flow from the atria to the ventricles); and aortic valve and pulmonary valve (which control blood flow out of the ventricles).
NCERT Page-284 / N-199
BODY FLUIDS and CIRCULATION(NCERT)
285949
In which part of the heart SA node is present
1 sinus-venosus
2 interatrial septum
3 right atrium
4 atrioventricular septum
Explanation:
(c) $SA$ (sino - atrial) node is called the natural pacemaker of the heart. It controls the heart rate by generating electrical impulses and then sending them through the heart muscle, causing the heart to contract and pump blood throughout the body. It is made up of a group of cells (called myocytes) and positioned on the wall of the right atrium, at the centre of the heart and near the entrance of the superior vena cava. These cells contract at a rate of about 70-80 times per minute, which make up the natural heartbeat.
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(NCERT)
285947
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.
NCERT Page-285 / N-200
BODY FLUIDS and CIRCULATION(NCERT)
285948
What is the function of valve?
1 To prevent blood from flowing into the aorta.
2 To push blood into the ventricle.
3 To push blood into the aorta.
4 To prevent backflow of blood into the left ventricle.
Explanation:
(d) Valves of heart maintain unidirectional flow of blood (i.e from the atria to the ventricles and from the ventricles to the pulmonary artery or aorta) and opening and closing of valve depends upon the pressure on opposite sides. It prevents its regurgitation in the opposite direction. These valves act like one way doors and allows blood to flow either forward into the next chamber or out of the heart via one of two main blood vessels that carry blood away from the heart. The valves close to prevent the back flow. The heart has 4 valves: mitral valve and tricuspid valve (which control blood flow from the atria to the ventricles); and aortic valve and pulmonary valve (which control blood flow out of the ventricles).
NCERT Page-284 / N-199
BODY FLUIDS and CIRCULATION(NCERT)
285949
In which part of the heart SA node is present
1 sinus-venosus
2 interatrial septum
3 right atrium
4 atrioventricular septum
Explanation:
(c) $SA$ (sino - atrial) node is called the natural pacemaker of the heart. It controls the heart rate by generating electrical impulses and then sending them through the heart muscle, causing the heart to contract and pump blood throughout the body. It is made up of a group of cells (called myocytes) and positioned on the wall of the right atrium, at the centre of the heart and near the entrance of the superior vena cava. These cells contract at a rate of about 70-80 times per minute, which make up the natural heartbeat.
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(NCERT)
285947
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.
NCERT Page-285 / N-200
BODY FLUIDS and CIRCULATION(NCERT)
285948
What is the function of valve?
1 To prevent blood from flowing into the aorta.
2 To push blood into the ventricle.
3 To push blood into the aorta.
4 To prevent backflow of blood into the left ventricle.
Explanation:
(d) Valves of heart maintain unidirectional flow of blood (i.e from the atria to the ventricles and from the ventricles to the pulmonary artery or aorta) and opening and closing of valve depends upon the pressure on opposite sides. It prevents its regurgitation in the opposite direction. These valves act like one way doors and allows blood to flow either forward into the next chamber or out of the heart via one of two main blood vessels that carry blood away from the heart. The valves close to prevent the back flow. The heart has 4 valves: mitral valve and tricuspid valve (which control blood flow from the atria to the ventricles); and aortic valve and pulmonary valve (which control blood flow out of the ventricles).
NCERT Page-284 / N-199
BODY FLUIDS and CIRCULATION(NCERT)
285949
In which part of the heart SA node is present
1 sinus-venosus
2 interatrial septum
3 right atrium
4 atrioventricular septum
Explanation:
(c) $SA$ (sino - atrial) node is called the natural pacemaker of the heart. It controls the heart rate by generating electrical impulses and then sending them through the heart muscle, causing the heart to contract and pump blood throughout the body. It is made up of a group of cells (called myocytes) and positioned on the wall of the right atrium, at the centre of the heart and near the entrance of the superior vena cava. These cells contract at a rate of about 70-80 times per minute, which make up the natural heartbeat.
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(NCERT)
285947
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.
NCERT Page-285 / N-200
BODY FLUIDS and CIRCULATION(NCERT)
285948
What is the function of valve?
1 To prevent blood from flowing into the aorta.
2 To push blood into the ventricle.
3 To push blood into the aorta.
4 To prevent backflow of blood into the left ventricle.
Explanation:
(d) Valves of heart maintain unidirectional flow of blood (i.e from the atria to the ventricles and from the ventricles to the pulmonary artery or aorta) and opening and closing of valve depends upon the pressure on opposite sides. It prevents its regurgitation in the opposite direction. These valves act like one way doors and allows blood to flow either forward into the next chamber or out of the heart via one of two main blood vessels that carry blood away from the heart. The valves close to prevent the back flow. The heart has 4 valves: mitral valve and tricuspid valve (which control blood flow from the atria to the ventricles); and aortic valve and pulmonary valve (which control blood flow out of the ventricles).
NCERT Page-284 / N-199
BODY FLUIDS and CIRCULATION(NCERT)
285949
In which part of the heart SA node is present
1 sinus-venosus
2 interatrial septum
3 right atrium
4 atrioventricular septum
Explanation:
(c) $SA$ (sino - atrial) node is called the natural pacemaker of the heart. It controls the heart rate by generating electrical impulses and then sending them through the heart muscle, causing the heart to contract and pump blood throughout the body. It is made up of a group of cells (called myocytes) and positioned on the wall of the right atrium, at the centre of the heart and near the entrance of the superior vena cava. These cells contract at a rate of about 70-80 times per minute, which make up the natural heartbeat.
