Match the columns. Column A Column B (i) Right atrium (a) Oscilloscope screen (ii) ECG (b) Amphibia (iii) Auricle (c) Vena cava (iv) Three-chambered heart (d) Fish (v) Two-chambered heart (e) Atria

(i)-(c) From the body, deoxygenated blood is released into the right atrium through superior and inferior vena cava. (ii)-(a) The graphic recording done by electrocardiograph is called an electrocardiogram (ECG). The graphic pattern reveals the condition of the heart. The pattern of electrical activity of the heart can also be seen on an oscilloscope screen. (iii)-(e) The atria are often also called auricles. The upper chambers of the heart are called auricles. Two auricles are present in the human heart, and these receive blood from various parts of the body and from the lungs. (iv)-(b) The heart with three chambers, two atria and one ventricle (sometimes incompletely divided) are called transitional heart. It is found in amphibians. (v)-(d) The heart with two chambers only, one atrium and one ventricle is called a single heart. It is found in fish. Column A Column B (i) Right atrium (c) Vena cava (ii) ECG (a) Oscilloscope screen (iii) Auricle (e) Atria (iv) Three-chambered heart (b) Amphibia (v) Two-chambered heart (d) Fish

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Initiation and stimulation of heartbeat take place by nerves.

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Important Questions on Human Circulatory System

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Mention the exact location of the following:
(v) Pulmonary semilunar valve

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Name the blood vessel which supplies blood to the liver.

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Describe double circulation in human heart.

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Look at the image of the human heart given below. Draw the same in your notebook and label the following parts.
a. Right auricle
b. Right ventricle
c. Left auricle
d. Left ventricle
e. Pulmonary artery
f. Pulmonary vein
g. Cardiac muscle

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Heartbeat depends upon

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Why is blood circulation in human heart called double circulation?

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Where does blood go from the right ventricle?

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What is meant by pulmonary and systemic circulation?

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Which one is the exact path of deoxygenated blood coming from the whole body?

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What is the function of a pacemaker?

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Science>Biology>Human Circulatory System>Human Circulatory System

Average heart beat/pulse rate in adult human being is

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Science>Biology>Human Circulatory System>Human Circulatory System

Match the columns.

Column A	Column B
(i) Right atrium	(a) Oscilloscope screen
(ii) ECG	(b) Amphibia
(iii) Auricle	(c) Vena cava
(iv) Three-chambered heart	(d) Fish
(v) Two-chambered heart	(e) Atria