Q78 / 200 · MHT CET - Medical 2026 (21 April Shift 2) · Biology

Given below are two statements, one is labelled as Assertion (A) and other one labelled as Reason (R).
Assertion (A): Capillaries are thin walled having a single cuboidal epithelium.
Reason (R): Blood flows through the capillaries under high pressure.
In light of the above statements, choose the correct answer from the options given below.

  • 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.
  • Correct answer
    D
    (A) is false but (R) is true.

Solution

Assertion (A) is false because capillaries are extremely thin-walled blood vessels composed of a single layer of simple squamous epithelium, known as the endothelium, resting on a basement membrane. They do not possess a cuboidal epithelium. Reason (R) is considered true because in specialized capillary beds, such as the glomerular capillaries in the kidneys, blood flows under relatively high hydrostatic pressure. This high pressure is essential for driving the process of ultrafiltration to form the primary urine. Since the assertion is undeniably incorrect, the only matching option is that (A) is false but (R) is true.

Answer: (A) is false but (R) is true.

Hence, the correct answer is option: 'D'.

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