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Question
Give reason for the following:
Only the veins and not the arteries are provided with valves.
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Solution
Veins carry the blood from the body part towards the heart while the arteries carry the blood
from the heart. Veins carry the blood against the force of gravity. Therefore, only the veins
and not the arteries are provided with valves.
RELATED QUESTIONS
The blood from the heart is transported to all parts of the body by the ______.
The diagram below represents the human heart in one phase of its function. Study the diagram carefully and answer the questions that follow:
(i) Name the phase.
(ii) Which part of the heart is contracting in this phase? Give a reason to support your answer.
(iii) Name the parts labelled 1 to 4.
(iv) What type of blood flows through ‘2’?
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(vi) Name the membrane that covers the heart.
Name the following:
The blood vessels which start from capillaries and end in capillaries.
Given below is a highly schematic diagram of the human blood circulatory system.
 |
- Which part (state the number) represents the heart? Give reason in support of your answer.
- Which numbers represent the following, respectively?
Aorta Superior vena cava Hepatic portal vein Renal Vein Pulmonary artery Stomach
Fill in the blanks with suitable words given below:
The ______ artery takes the blood from the ventricles to the lungs.
True or false:
Blood group A has antigen A.
Name the main parts of the circulatory system
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.
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(iv) Name the valve found at the beginning of the part labeled 3.
Explain the main parts of the circulatory system.
______ WBCs are present per mm3 of blood.
