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Question
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Solution
Circulatory system: It is a system of organs that takes part in the flow of materials in the body of an organism inside an extracellular fluid.
Circulatory system in humans:
(a) The right atrium receives deoxygenated blood from all the parts of the body through large veins called vena cava.
(b) When the right atrium is full of blood, it contracts and the blood is forced into right ventricle.
(c) When the right ventricle is full of blood, it contracts and the blood is pumped into the pulmonary trunk.
(d) From right ventricle, the pulmonary artery carries the blood to the lungs for oxygenation.
(e) The oxygenated blood returns to the heart via pulmonary veins that empty into the left auricle.
(f) When the left auricle contracts, the blood passes into the left ventricle by the opening of bicuspid valve.
(g) On contraction of the left ventricle, the blood is pumped into the artery called aorta.
(h) The aorta branches into vessels which transports blood to the heart and all the body parts.
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RELATED QUESTIONS
The diagram below represents the simplified pathway of the circulation of blood. Study the same and answer the questions which follow:
(i) Name the blood vessels labelled 1 and 2.
(ii) State the function of blood vessels labelled 5 and 8.
(iii) What is the importance of the blood vessel labelled 6?
(iv) Which blood vessel will contain a high amount of glucose and amino acids after a meal?
(v) Draw a diagram of the different blood cells as seen in a smear of human blood.
Name the following:
The fluid found between the membranes of the heart.
Note the relationship between the first two words and suggest a suitable word/words for the fourth place:
Coronary artery : Heart :: Hepatic artery : ______
How do you account for the following difference?
The left ventricle has thicker walls than the right ventricle.
Given diagram shows a simple diagram of the circulation of blood in a mamma showing the
main blood vessels, the heart, lungs and body tissues. The blood vessel, labelled 6, contains
deoxygenated blood and the valve leading to it has three semi-lunar pockets.
(a) Name the blood vessels and organs marked by numbers 1 to 8.
(b) What is meant by the term ‘double circulation’ of blood in mammals?
(c) what is diastole?
[There is an “error” in the diagram. According to the usual practice the pulmonary (lung)
circulation is shown upward and the systemic downward, but here it is reversed].
Find out my partner.
| Group 'A' | Group 'B' |
| 1. Heart beats | a. 350 ml |
| 2. RBC | b. 7.4 |
| 3. WBC | c. 37∘C |
| 4. Blood donation | d. 72 |
| 5. Normal body Temperature | e. 50-60 lakh/mm3 |
| 6. pH of oxygenated blood | f. 5000-6000 per mm3 |
Put a tick mark (✓) against the correct alternative in the following statement.
The only artery which carries deoxygenated blood is called,
Given below is a schematic representation of the circulatory system in man. Study the same and answer the questions that follow:
(i) Label the parts 1 to 4 indicated in the diagram.
(ii) Give one difference between parts 1 and 2 based on:
(a) their structure
(b) the nature of blood flowing through them.
(iii) What is the specific name of the type of blood circulation that takes place between the heart and the lungs?
(iv) Name the valve found at the beginning of the part labeled 3.
Explain the Term
Hepatic Portal System
In a closed circulatory system, blood is completely enclosed within:
