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Annelids and chordates have a closed circulatory system in which the blood pumped by the   (heart/lungs/gills) is always circulated through a closed network of blood vessels.

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Important Questions on Body Fluids and Circulation

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Biology>Human Physiology>Body Fluids and Circulation>Human Circulatory System
Which one of the following animals has two separate circulatory pathways?
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Biology>Human Physiology>Body Fluids and Circulation>Human Circulatory System
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 Physiology>Body Fluids and Circulation>Human Circulatory System
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 Physiology>Body Fluids and Circulation>Human Circulatory System
Blood pressure in the pulmonary artery is:
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Biology>Human Physiology>Body Fluids and Circulation>Human Circulatory System
How do parasympathetic neural signals affect the working of the heart?
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Biology>Human Physiology>Body Fluids and Circulation>Human Circulatory System
Correct course of blood circulation in human heart.
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Biology>Human Physiology>Body Fluids and Circulation>Human Circulatory System
Blood pressure in the mammalian aorta is maximum during
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Biology>Human Physiology>Body Fluids and Circulation>Human Circulatory System
The hepatic portal vein drains blood to the liver from
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Biology>Human Physiology>Body Fluids and Circulation>Human Circulatory System
In mammals, which blood vessel would normally carry the largest amount of urea?
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Biology>Human Physiology>Body Fluids and Circulation>Human Circulatory System
What is the nature of blood passing through the blood vessels A, B, C and D respectively?
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Biology>Human Physiology>Body Fluids and Circulation>Human Circulatory System
Choose the wrong statement regarding the circulatory system of frog.
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Biology>Human Physiology>Body Fluids and Circulation>Human Circulatory System

The pulmonary artery is connected to the aorta during fetal life by

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Biology>Human Physiology>Body Fluids and Circulation>Human Circulatory System
Which of the following sequences is truly a systemic circulation pathway?
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Biology>Human Physiology>Body Fluids and Circulation>Human Circulatory System
The figure shows a schematic plan of blood circulation in humans with labels A to D. Identify the label and give its function/s.
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Biology>Human Physiology>Body Fluids and Circulation>Human Circulatory System
The pH of blood is
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Biology>Human Physiology>Body Fluids and Circulation>Human Circulatory System
A vein possesses a large lumen because;
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Biology>Human Physiology>Body Fluids and Circulation>Human Circulatory System
Find the mismatch from the following:
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Biology>Human Physiology>Body Fluids and Circulation>Human Circulatory System
What is meant by double circulation? What is its significance? 
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Biology>Human Physiology>Body Fluids and Circulation>Human Circulatory System
Blood capillaries are made up of
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Biology>Human Physiology>Body Fluids and Circulation>Human Circulatory System
Blood leaving the left ventricle goes through which of the following valves?