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प्रश्न
What prevents the backflow of blood inside the heart during contraction?
पर्याय
Thick muscular walls of ventricles
Valves
Thin walls of atria
All of the above
उत्तर
Valves
During contraction, valves prevent the back-flow of blood inside the heart.
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संबंधित प्रश्न
The human body has an organ A which acts as a double pump. The oxygenated blood coming from the lungs through blood vessel B enters the upper left chamber C of the double pump. When chamber C contracts, then blood goes into the lower left chamber D. The contraction of chamber D forces the blood to go into a blood vessel E which supplies oxygenated blood to all the organs of the body (except the lungs). The deoxygenated blood coming out of the body organs is taken by a blood vessel F to the right upper chamber G of the pumping organ. Contraction of chamber G forces the deoxygenated blood into the right lower chamber H. And finally, the contraction of chamber H sends the deoxygenated blood into the lungs through blood vessel I.
- What is organ A?
- Name the blood vessel (i) B (ii) E (iii) F, and (iv) I.
- What are chambers (i) C, and (ii) D?
- What are chambers (i) G and (ii) H?
Fill in the blank with suitable word given below:
The oxygen-rich blood from the lungs comes into the __________ of the heart.
Describe the function of Heart.
Why is the SA node called the pacemaker of the heart?
____________ guards the left atrioventricular aperture in human heart.
______ externally separates ventricles from each other.
Assertion: Human heart does not allow the mixing of oxygen to reach blood with carbon dioxide to reach the blood.
Reason: Human heart has different chambers.
The heartbeat about ______ in a minute.
In human foetus, the heart begins to beat at developmental age of
What is the role of Paplillary muscles?
