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Veins are thin walled and have valves. J...

Veins are thin walled and have valves. Justify

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### Step-by-Step Solution: 1. **Understanding the Function of Veins**: - Veins are blood vessels that carry deoxygenated (impure) blood back to the heart. This is crucial for the circulatory system as it helps in the removal of carbon dioxide and other waste products from the body. 2. **Structure of Veins**: - Veins have thin walls compared to arteries. The reason for this is that veins operate under lower pressure. The blood in veins is not pumped directly from the heart but rather flows back due to the pressure from the surrounding muscles and the negative pressure created in the thoracic cavity during breathing. ...
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Knowledge Check

  • Refer to the given paragraph where few words/phrases have been italicised. There are three kinds of blood vessels in humans. Arteries are thick walled vessels that carry deoxygenated blood (except pulmonary artery) away from heart. Veins are thin walled, vessels that bring oxygenated blood (except pulmonary vein) back to the heart. Capillaries are thin walled vessels that are permeable to water and dissolved substances. Select the correct option regarding it.

    A
    Thick and thin should be interchanged.
    B
    Oxygenated and deoxygenated should be interchanged.
    C
    Pulmonary artery should be replaced with carotid artery whereas pulmonary vein should not be replaced as it is correctly mentioned.
    D
    Permeable should be replaced with impermeable.

  • Assertion (A) : Veins have thinner walls compared to arteries. Reason (R) : Veins carry deoxygenated blood.

    A
    Both (A) and (R) are true and (R) is correct explanation of the assertion.
    B
    Both (A) and (R) are true but (R) is not the correct explanation of the assertion.
    C
    (A) is true but (R) is false.
    D
    (A) is false bu (R) is true.

  • Which of the following statements are true about veins in human circulatory system? A. All veins carry carbon dioxide-rich blood. B. Veins have thin walls. C. Veins carry blood from different organs to heart.

    A
    A, B and C
    B
    A and B
    C
    B and C
    D
    A and C

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