Question

The thinnest blood vessels are

• A. arteries
• B. veins
• C. capillaries
• D. aorta

Answer 1

The correct option is C

capillaries

The correct option is C.

Explanation of the correct option:

Capillaries are tiny, extremely thin-walled vessels that act as a bridge between arteries (which carry blood away from the heart) and veins (which carry blood back to the heart).

Explanation of the incorrect options:

Option A:

1. Arteries are the main blood vessels that carry and transport oxygenated blood or oxygen-rich blood from the heart to other parts of the body.
2. They are the strongest blood vessels with thicker walls and are muscular in nature.
3. It consists of three distinct layers, which are rigid, thicker and highly muscular.

Option B:

1. Veins are thin, tube-like elastic blood vessels, present closer to the surface of the skin.
2. These translucent blood vessels are blue in colour and carry impure or deoxygenated blood from all parts of the body to heart.
3. These blood vessels are with low pressure and move in an upward direction, i.e. from the cells, tissues and other organs to the heart.
4. Compared to the arteries, veins are thin-walled.

Option D:

1. Aorta is the artery that supplies oxygenated blood to the rest of the body.
2. It carries oxygenated blood to the whole body.

Final answer: The thinnest blood vessels are capillaries.