Differentiate between each of the following pairs with reference to the aspect asked within brackets:
(a) Erythrocytes and leucocyte (function)
(b) Artery and vein (direction of blood flow)
(c) Artery and vein (the type of blood primarily flowing through)
(d) Tricuspid and bicuspid valves (location).

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Solution

(a)

Erythrocytes Leucocytes

They function in the transport of oxygen throughout the body and in the removal of carbon dioxide from the body. They help in the defence of the body against disease-causing pathogens.

(b) An artery carries blood away from the heart whereas a vein brings blood towards the heart.
(c) An artery generally contains oxygenated blood whereas a vein generally carries deoxygenated blood.
(d) The tricuspid valve is located between the right atrium and right ventricle of the heart whereas a bicuspid valve is located between the left atrium and left ventricle of the heart.

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ii) Artery and vein (direction of blood flow)
iii) Right atrium and left atrium (nature of blood)

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Blood flowing in arteries is without high pressure.

(2)

Blood flowing in veins is without high pressure.

(3)

Veins have valves opening towards heart.

(4)

Arteries have valves opening towards heart.

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Q. Blood flowing through arteries and veins have the same amount of dissolved oxygen.

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Erythrocytes	Leucocytes
They function in the transport of oxygen throughout the body and in the removal of carbon dioxide from the body.	They help in the defence of the body against disease-causing pathogens.