Valves in Heart
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If due to some injury the chordae tendineae of the tricuspid valve of the human heart is partially non-functional, what will be the immediate effect?
The blood will tend to flow back into the left atrium.
The flow of blood into the aorta will be slowed down.
The pacemaker will stop functioning.
The flow of blood into the pulmonary artery will be reduced.
Which of the following do not develop from the mesoderm?
connective tissue
brain
bones
muscle
The valve situated between the left atrium and the left ventricle is called
(1) Bicuspid valve (2) Tricuspid valve (3) Mitral valve (4) Eustachian tube
1 and 3 are correct.
l, 2 and 3 are correct.
1 and 2 are correct.
2 and 4 are correct.
Which of the following is not true about the heart valves?
The mitral valve separates the left atrium from the left ventricle
The tricuspid valve divides the right atrium from the right ventricle
Aortic and pulmonary valves control the flow of blood into the heart
The pulmonary valves are supported by chordae tendineae so that the regurgitation of blood into the atria during ventricular contraction does not occur
- Thebesian valve
- Eustachian valve
- Mitral valve
- None of the above
- auricles
- ventricles
- pulmonary trunk
- both a and b
Reason: Pulmonary trunk is not guarded by any valves.
- Both the assertion and reason are true and the reason is the correct explanation for the assertion
- Both the assertion and reason are true but the reason is not the correct explanation for the assertion
- Assertion is true but the reason is false
- Both the assertion and reason are false
Through how many heart valves does blood pass as it moves from the lungs to the aorta?
The action potential always moves in one direction because of _____.
Closing of the voltage regulated gate of the Voltage gated Sodium channels
Closing of the inactivation gate of Voltage gated Sodium channels
Synaptic neurotransmitter release
Sodium potassium ATPase pump
- Tricuspid valve
- Aortic valve
- Pulmonary valve
- Mitral valve
- Tricuspid valve
- Bicuspid valve
- Mitral valve
- Semilunar valve
- inferior vena cava and right atrium
- superior vena cava and right atrium
- coronary sinus and right atrium
- pulmonary vein and left atrium
Assertion[A]: Atria and ventricles do not contract at the same time.
Reason[R]: This time delay allows proper filling of all the 4 chambers of the heart and results in an efficient pumping of blood.
A is true and R is false.
R is true and A is false.
Both A and R are true and R is correct explanation of A.
Both A and r are true but R is not correct explanation for A.
- right atrium, right ventricle
- left atrium, left ventricle
- aorta, left ventricle
- left ventricle, left atrium
what does oxygen saturation of arterial blood mean?