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The Circulatory System
Give reasons for the following:
(iv) A matured mammalian erythrocyte lacks nucleus and mitochondria.
A lack of nucleus increases the surface area volume ratio. More erythrocytes can be
accommodated in the same space. At the same time, the oxygen-carrying capacity of
erythrocytes also increases.
Lack of mitochondria ensures that all the oxygen carried by RBCs is transported and delivered to the tissues. Therefore, a mature mammalian erythrocyte lacks a nucleus and mitochondria.
Some More Questions From The Circulatory System Chapter
Differentiate between the following pairs on the basis of what is mentioned
within brackets:
ii. RBC and WBC (Shape)
within brackets:
ii. RBC and WBC (Shape)
The diagram below represents the human heart in one phase of its function.
Study the diagram carefully and answer the questions that follow:
i. Name the phase.
ii. Which part of the heart is contracting in this phase? Give a reason to support your answer.
iii. Name the parts labelled 1 to 4.
iv. What type of blood flows through ‘2’?
v State the function of the part numbered ‘5’.
vi Name the membrane that covers the heart.
Explain the following terms:
v. Pulse
Name the following :
The mineral element essential for the clotting of blood.
State the main functions of the following:
Coronary artery
Coronary artery
State the main functions of the following:
Thrombocytes
Thrombocytes
Give the exact location of the following:
Mitral valve
Mitral valve
Rewrite and complete the following sentences by inserting the correct word in the
space indicated:
(ii) The blood vessel which begins and ends in capillaries is the ............ .
space indicated:
(ii) The blood vessel which begins and ends in capillaries is the ............ .
Study the following diagram carefully and answer the questions which follow:
(i) Name the celll.
(ii) What phenomenon is occurring in A?
(iii) Mention two structural differences between 1 and 2.
(iv) Name the process occurring in B and C and state the importance of this process in
the human body.
(i) Name the celll.
(ii) What phenomenon is occurring in A?
(iii) Mention two structural differences between 1 and 2.
(iv) Name the process occurring in B and C and state the importance of this process in
the human body.
Give reasons for the following:
(iv) A matured mammalian erythrocyte lacks nucleus and mitochondria.
(iv) A matured mammalian erythrocyte lacks nucleus and mitochondria.
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Mock Test Series
Mock Test Series