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(a) Mention any two components of blood....

(a) Mention any two components of blood.
(b) Trace the movement of oxygenated blood in the body.
(c ) Write the function of valves present in between atria and ventricles.
(d ) Write one structural difference between the composition of artery and veins.

Text Solution

Verified by Experts

(a) Plasma, red blood cells, white blood cells, platelets
(b) `"Lungs" to "Left side of the heart" to "aorta" to "body organs"`
Detailed Answer:
(a) Two components of blood are - plasma and blood corpuscles.
(b) Oxygenated blood arrives at the right hand side of the heart. It enters the heart through the pulmonary vein. Blood is pumped into the left ventricle. Blood is pumped out of the heart, along the aorta, to the rest of the body.
(c) As the heart muscle contracts and relaxes, the valves open and shut, letting blood flow into the ventricles and atria at alternate times. When the left ventricle contracts, the mitral valve closes and the aortic valve opens, so blood flows into the aorta.
(d) Artery wall is thick and valves are absent whereas vein wall is thin and value are present.
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Knowledge Check

  • Assertion (A): Valves are present in the arteries. Reason (R): Arteries carry oxygenated blood from heart to different body parts except pulmonary artery.

    A
    Both A and R are true and R is the correct explanation of A.
    B
    Both A and R are true but R is NOT the correct explanation of A.
    C
    A is true but R is false.
    D
    A is false and R is true.

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