339438
Sino-Atrial node (SAN) can generate impulses
1 \(70-75 \mathrm{~min}^{-1}\)
2 \(50-55 \mathrm{~min}^{-1}\)
3 \(35-40 \mathrm{~min}^{-1}\)
4 \(90-100 \mathrm{~min}^{-1}\)
Explanation:
The SAN can generate the maximum number of action potentials, i.e., \(70-75 \mathrm{~min}^{-1}\), and is responsible for initiating and maintaining the rhythmic contractile activity of the heart. Therefore, it is called the pacemaker. Our heart normally beats 70-75 times in a minute (average 72 beats \(\mathrm{min}^{-1}\) ).
BIOXI18: BODY FLUIDS AND CIRCULATION
339439
Statement A : The opening between left atrium and left ventricle is guarded by mitral valve. Statement B : The opening of the right and left ventricles into the pulmonary artery and the aorta respectively are provided with the semi-lunar valves.
1 Statement A is correct but Statement B is incorrect.
2 Statement A is incorrect but Statement B is correct.
3 Both statements are correct.
4 Both Statements are incorrect.
Explanation:
Both the given statements are correct.
BIOXI18: BODY FLUIDS AND CIRCULATION
339440
Tricuspid valve is present between
1 Left atrium and left ventricle
2 Right atrium and right ventricle
3 Right atrium and left ventricle
4 Left atrium and right ventricle
Explanation:
The opening between the right atrium and the right ventricle is guarded by a valve formed of three muscular flaps or cusps, the tricuspid valve.
BIOXI18: BODY FLUIDS AND CIRCULATION
339441
Assertion : SA node is contraction centre or pacemaker. Reason : Nodal fibres of SA node are embedded in the wall of the right atrium.
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Both Assertion and Reason are incorrect
Explanation:
The nodal fibres of SA node are completely embedded in the wall of the right atrium. On the other hand the muscle fibres of SA node possess the highest rhythmicity among all cardiac muscle fibres and can initiate excitatory waves at the highest rate. The SA node determines the rate of heartbeat and is thus called the pacemaker of heart. It controls the rhythm of the heartbeat in a normal range. Thus, both assertion and reason are true but the reason is not the correct explanation of assertion.
339438
Sino-Atrial node (SAN) can generate impulses
1 \(70-75 \mathrm{~min}^{-1}\)
2 \(50-55 \mathrm{~min}^{-1}\)
3 \(35-40 \mathrm{~min}^{-1}\)
4 \(90-100 \mathrm{~min}^{-1}\)
Explanation:
The SAN can generate the maximum number of action potentials, i.e., \(70-75 \mathrm{~min}^{-1}\), and is responsible for initiating and maintaining the rhythmic contractile activity of the heart. Therefore, it is called the pacemaker. Our heart normally beats 70-75 times in a minute (average 72 beats \(\mathrm{min}^{-1}\) ).
BIOXI18: BODY FLUIDS AND CIRCULATION
339439
Statement A : The opening between left atrium and left ventricle is guarded by mitral valve. Statement B : The opening of the right and left ventricles into the pulmonary artery and the aorta respectively are provided with the semi-lunar valves.
1 Statement A is correct but Statement B is incorrect.
2 Statement A is incorrect but Statement B is correct.
3 Both statements are correct.
4 Both Statements are incorrect.
Explanation:
Both the given statements are correct.
BIOXI18: BODY FLUIDS AND CIRCULATION
339440
Tricuspid valve is present between
1 Left atrium and left ventricle
2 Right atrium and right ventricle
3 Right atrium and left ventricle
4 Left atrium and right ventricle
Explanation:
The opening between the right atrium and the right ventricle is guarded by a valve formed of three muscular flaps or cusps, the tricuspid valve.
BIOXI18: BODY FLUIDS AND CIRCULATION
339441
Assertion : SA node is contraction centre or pacemaker. Reason : Nodal fibres of SA node are embedded in the wall of the right atrium.
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Both Assertion and Reason are incorrect
Explanation:
The nodal fibres of SA node are completely embedded in the wall of the right atrium. On the other hand the muscle fibres of SA node possess the highest rhythmicity among all cardiac muscle fibres and can initiate excitatory waves at the highest rate. The SA node determines the rate of heartbeat and is thus called the pacemaker of heart. It controls the rhythm of the heartbeat in a normal range. Thus, both assertion and reason are true but the reason is not the correct explanation of assertion.
339438
Sino-Atrial node (SAN) can generate impulses
1 \(70-75 \mathrm{~min}^{-1}\)
2 \(50-55 \mathrm{~min}^{-1}\)
3 \(35-40 \mathrm{~min}^{-1}\)
4 \(90-100 \mathrm{~min}^{-1}\)
Explanation:
The SAN can generate the maximum number of action potentials, i.e., \(70-75 \mathrm{~min}^{-1}\), and is responsible for initiating and maintaining the rhythmic contractile activity of the heart. Therefore, it is called the pacemaker. Our heart normally beats 70-75 times in a minute (average 72 beats \(\mathrm{min}^{-1}\) ).
BIOXI18: BODY FLUIDS AND CIRCULATION
339439
Statement A : The opening between left atrium and left ventricle is guarded by mitral valve. Statement B : The opening of the right and left ventricles into the pulmonary artery and the aorta respectively are provided with the semi-lunar valves.
1 Statement A is correct but Statement B is incorrect.
2 Statement A is incorrect but Statement B is correct.
3 Both statements are correct.
4 Both Statements are incorrect.
Explanation:
Both the given statements are correct.
BIOXI18: BODY FLUIDS AND CIRCULATION
339440
Tricuspid valve is present between
1 Left atrium and left ventricle
2 Right atrium and right ventricle
3 Right atrium and left ventricle
4 Left atrium and right ventricle
Explanation:
The opening between the right atrium and the right ventricle is guarded by a valve formed of three muscular flaps or cusps, the tricuspid valve.
BIOXI18: BODY FLUIDS AND CIRCULATION
339441
Assertion : SA node is contraction centre or pacemaker. Reason : Nodal fibres of SA node are embedded in the wall of the right atrium.
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Both Assertion and Reason are incorrect
Explanation:
The nodal fibres of SA node are completely embedded in the wall of the right atrium. On the other hand the muscle fibres of SA node possess the highest rhythmicity among all cardiac muscle fibres and can initiate excitatory waves at the highest rate. The SA node determines the rate of heartbeat and is thus called the pacemaker of heart. It controls the rhythm of the heartbeat in a normal range. Thus, both assertion and reason are true but the reason is not the correct explanation of assertion.
339438
Sino-Atrial node (SAN) can generate impulses
1 \(70-75 \mathrm{~min}^{-1}\)
2 \(50-55 \mathrm{~min}^{-1}\)
3 \(35-40 \mathrm{~min}^{-1}\)
4 \(90-100 \mathrm{~min}^{-1}\)
Explanation:
The SAN can generate the maximum number of action potentials, i.e., \(70-75 \mathrm{~min}^{-1}\), and is responsible for initiating and maintaining the rhythmic contractile activity of the heart. Therefore, it is called the pacemaker. Our heart normally beats 70-75 times in a minute (average 72 beats \(\mathrm{min}^{-1}\) ).
BIOXI18: BODY FLUIDS AND CIRCULATION
339439
Statement A : The opening between left atrium and left ventricle is guarded by mitral valve. Statement B : The opening of the right and left ventricles into the pulmonary artery and the aorta respectively are provided with the semi-lunar valves.
1 Statement A is correct but Statement B is incorrect.
2 Statement A is incorrect but Statement B is correct.
3 Both statements are correct.
4 Both Statements are incorrect.
Explanation:
Both the given statements are correct.
BIOXI18: BODY FLUIDS AND CIRCULATION
339440
Tricuspid valve is present between
1 Left atrium and left ventricle
2 Right atrium and right ventricle
3 Right atrium and left ventricle
4 Left atrium and right ventricle
Explanation:
The opening between the right atrium and the right ventricle is guarded by a valve formed of three muscular flaps or cusps, the tricuspid valve.
BIOXI18: BODY FLUIDS AND CIRCULATION
339441
Assertion : SA node is contraction centre or pacemaker. Reason : Nodal fibres of SA node are embedded in the wall of the right atrium.
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Both Assertion and Reason are incorrect
Explanation:
The nodal fibres of SA node are completely embedded in the wall of the right atrium. On the other hand the muscle fibres of SA node possess the highest rhythmicity among all cardiac muscle fibres and can initiate excitatory waves at the highest rate. The SA node determines the rate of heartbeat and is thus called the pacemaker of heart. It controls the rhythm of the heartbeat in a normal range. Thus, both assertion and reason are true but the reason is not the correct explanation of assertion.
