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A vein possesses a large lumen because

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Important Questions on Body Fluids and Circulation

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Biology>Human Anatomy and Physiology-II>Body Fluids and Circulation>Double Circulation

Correct course of blood circulation in human heart.

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Biology>Human Anatomy and Physiology-II>Body Fluids and Circulation>Double Circulation

Blood pressure in the mammalian aorta is maximum during

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Biology>Human Anatomy and Physiology-II>Body Fluids and Circulation>Double Circulation

The hepatic portal vein drains blood to the liver from

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Biology>Human Anatomy and Physiology-II>Body Fluids and Circulation>Double Circulation

Erythropoiesis starts in:

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Biology>Human Anatomy and Physiology-II>Body Fluids and Circulation>Double Circulation

Statement (S): The sinoatrial node is called 'Pace-maker'.

Reason (R): The sinoatrial node contains specialised cardiomyocytes and generates action potentials without any external stimuli.

The correct answer is

MEDIUM

Biology>Human Anatomy and Physiology-II>Body Fluids and Circulation>Double Circulation

Doctors use a stethoscope to hear the sounds produced during each cardiac cycle. The second sound is heard when:

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Biology>Human Anatomy and Physiology-II>Body Fluids and Circulation>Double Circulation

Which one of the following animals has two separate circulatory pathways?

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Biology>Human Anatomy and Physiology-II>Body Fluids and Circulation>Double Circulation

Match the different types of heart given in column A with organisms given in column B. Choose the correct combination.

Column A	Column B
P. Neurogenic heart.	i. Human
Q. Bronchial heart.	ii. King crab
R. Pulmonary heart.	iii. Shark

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Biology>Human Anatomy and Physiology-II>Body Fluids and Circulation>Double Circulation

Purkinje fibres are located in the following structure/s

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Biology>Human Anatomy and Physiology-II>Body Fluids and Circulation>Double Circulation

Match the items given in Column I with those in Column II and select the correct option given below:

	Column – I		Column – II
a.	Tricuspid valve	i.	Between left atrium and left ventricle.
b.	Bicuspid valve	ii.	Between the right ventricle and pulmonary artery.
c.	Semilunar valve	iii.	Between the right atrium and right ventricle.

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Biology>Human Anatomy and Physiology-II>Body Fluids and Circulation>Double Circulation

The pulmonary artery carries

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Biology>Human Anatomy and Physiology-II>Body Fluids and Circulation>Double Circulation

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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Biology>Human Anatomy and Physiology-II>Body Fluids and Circulation>Double Circulation

Assertion (A): Pulmonary aorta in human embryo communicates with systemic aorta by a thin vessel called ductus arteriosus.
Reason (R): In the heart of the human embryo, oxygenated and deoxygenated blood is completely separated.

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Biology>Human Anatomy and Physiology-II>Body Fluids and Circulation>Double Circulation

In mammals, which blood vessel would normally carry the largest amount of urea?

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Biology>Human Anatomy and Physiology-II>Body Fluids and Circulation>Double Circulation

Blood pressure in the pulmonary artery is:

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Biology>Human Anatomy and Physiology-II>Body Fluids and Circulation>Double Circulation

Which one of the following graphs best describes the Blood Pressure (BP) change when blood moves from aorta to capillaries?

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Biology>Human Anatomy and Physiology-II>Body Fluids and Circulation>Double Circulation

Name a vessel that starts and terminates with capillaries. (Hepatic portal artery/Hepatic portal vein)