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What is the role of the arterioles?

Important Questions on Life Processes

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Blood pressure in the mammalian aorta is maximum during
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Which one of the following graphs best describes the Blood Pressure (BP) change when blood moves from aorta to capillaries?

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Given below are sets of five terms each. Rewrite the terms in correct order in a logical sequence beginning with the first word that is underlined:

Artery, Capillaries, Venule, Vein, Arteriole.

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The blood vessels that carry blood away from the heart is:
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Name a vessel that starts and terminates with capillaries. (Hepatic portal artery/Hepatic portal vein)
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Each artery and vein consists of three layers: an inner lining of         (i)            endothelium, the tunica intima, a middle layer of            (ii)               and             (iii)        fibres, the tunica media and an external layer of              (iv)            tissue with            (v)         fibres, the tunica externa.
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Maximum surface area of circulating system is seen in
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In the foetus, the ductus arteriosus connects the
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pH of blood in artery and vein is
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Blood capillaries are made of

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Given below are three statements (I–III) regarding the human blood circulatory system.


(I)    In the treatment of angina pectoris, nitrous oxide and nitroglycerine are used.
(II)   Veins have thinner walls and broader lumen than arteries.
(III)  Artificial pacemakers are used in arrhythmia.

How many of the above are correct statements?

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A vein possesses a large lumen because

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As the age advances, there is a gradual thinning of hair in human males. This is mainly because of lowered.
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A vein possesses a large lumen because
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 Given below is a schematic representation of secretion of gland A and a blood capillary in its close proximity,

Question Image

 What do the arrows outside the blood capillary indicate?

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In mammals, veins differs from arteries in having
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Pulmonary artery differ from pulmonary vein in having:

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The main difference in the structure of arteries and veins is in:
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What is vasomotor tone?
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Represent the union of two sets by Venn diagram for each of the following.

X={x | x is a prime number between 80 and 100}

Y={y | y is an odd number between 90 and 100}