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प्रश्न
Explain the following:
Why is the closed circulatory system more efficient than the open system?
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उत्तर
The closed circulatory system is more efficient than the open system because in closed system the blood flows inside arteries or veins all the time which stops the mixing of blood with other bodily fluids and helps the transport of the blood around the body.
संबंधित प्रश्न
Why is blood needed by all the parts of a body?
fill in the blanks with suitable functions: Eustachian Tube and ______
The diagram given below represents the human heart in one phase of its functions. Study the diagram carefully and 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 labelled 1 to 4.
- What type of blood flows through 2?
- State the function of the part numbered ‘5’.
- Name the membrane that covers the heart.
Angina pectoris is due to
Name the following:
The fluid found between the membranes of the heart.
Match the items given in Column A with the most appropriate ones in Column B and REWRITE the correct matching pairs :
Column A Column B
(i) Cranial nerves Testosterone
(ii) Leydig cells Natural reflex
(iii) Acetylcholine 12 pairs
(iv) Spinal nerves Prolactin
(v) Sneezing Neurotransmitter
- 18 pairs
- 31 pairs
- Conditioned reflex
Name the three kinds of blood vessels found in human beings. With the help of suitable diagrams, differentiate between them.
Veins have valves at intervals in their inner lining whereas the arteries do not have valves. Explain.
Name the Following
The blood plasma from which fibrinogen has been removed.
Use your brain power!
How is the air that we inhale purified in our body?
