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प्रश्न
What prevents the backflow of blood inside the heart during contraction?
विकल्प
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
Choose the correct answer:
Which of the following engulfs pathogen rapidly?
The diagram given below represents the human heart in one phase of its activity. Study the same and then answer the questions that follow:
 |
- Name the phase.
- Which part of the heart is contracting in this phase? Give a reason to support your answer.
- Name the parts numbered 1to6.
- What type of blood flows through the parts marked 'l' and '2' respectively?
- How many valves are closed in this phase?
Name the Following
Number of chambers present in the human heart.
Name the Following
Layer, which surrounds the heart.
______ is known as pacemaker of heart.
What is the importance of valves in the heart?
The back flow of blood during the pumping of blood by the heart is prevented by:
Enlist the names and locations of valves of human heart giving function of each.
What is the role of Heart valves in human heart?
The diagram below depicts the human heart in one of its phases. Answer the questions that follow:
- Which part of the heart is in the contraction phase?
- Give a suitable reason to justify your answer in (a).
- Distinguish between Systole and Diastole.
