Arteries
A. have values.
B. are deep-seated under the skin.
C. have thick muscular walls.
D. carry blood to the heart.

(a). A and B are correct.
(b) B and D are correct.
(c) Only C is correct.
(d) B and C are correct.

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Solution

(d) B and C are correct.

Valves are not present in arteries. They are deep-seated under the skin. They have thick muscular walls. Arteries carry blood from the heart to other parts of the body.

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Question 21
Choose the correct statement that describes arteries.

(a) They have thick elastic walls, blood flows under high pressure; collect blood from different organs and bring it back to the heart.
(b) They have thin walls with valves inside, blood flows under low pressure and carries blood away from the heart to various organs of the body.
(c) They have thick elastic walls, blood flows under low pressure; carry blood from the heart to various organs of the body.
(d) They have thick elastic walls without valves inside, blood flows under high pressure and carries blood away from the heart to different parts of the body.

Give a reason for the following:
(a) The walls of the left ventricle are thicker than the walls of all other chambers.
(b) Blood flows away from the stomach and intestines is put into circulation via the liver and not directly.
(c) The blood groups of both the donor and recipient must be known before transfusing blood.
(d) Only the veins and not the arteries are provided with a valve.
(e) Atrial wall is less muscular than the ventricular wall.
(f) The arteries are deep-seated in the body.

Q. Select the incorrect statements.
A. Arteries have thick elastic walls and veins have valves.
B. Capillaries are the smallest blood vessels supplying the tissues.
C. AV node is known as the pace setter of the heart.
D. Arteries carry blood towards the heart and veins carry blood away from the heart to different organs.

Q. Given below are four statements (a-d) regarding human blood circulatory system.

(a) Arteries are thick-walled and have narrow lumen as compared to veins.
(b) Angina is acute chest pain when the blood circulation of the brain is reduced.
(c) Persons with blood group AB can donate blood to any person with any blood group under ABO system.
(d) Calcium ions play a very important role in blood clotting.

Which two of the above statements are correct?

Q. Saprophytes are organisms that
(A) live on other organisms.
(B) live on dead and decaying matter.
(C) are useful to us.
(D) are all harmful to us.

(a) Only A and D are correct.
(b) Only B and C are correct.
(c) Only A and C are correct.
(d) Only C and D are correct.

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Arteries A. have values. B. are deep-seated under the skin. C. have thick muscular walls. D. carry blood to the heart. (a). A and B are correct. (b) B and D are correct. (c) Only C is correct. (d) B and C are correct.

(d) B and C are correct. Valves are not present in arteries. They are deep-seated under the skin. They have thick muscular walls. Arteries carry blood from the heart to other parts of the body.

Arteries
A. have values.
B. are deep-seated under the skin.
C. have thick muscular walls.
D. carry blood to the heart.

(a). A and B are correct.
(b) B and D are correct.
(c) Only C is correct.
(d) B and C are correct.

(d) B and C are correct.

Valves are not present in arteries. They are deep-seated under the skin. They have thick muscular walls. Arteries carry blood from the heart to other parts of the body.