Question

1. Which among the three is the thickest blood
vessel? What is its role?
2. Which is the thinnest of the three blood vessels? Mention its role.
3. Name the blood vessel that has valves inside it. Why are they present?​

Answer 1

Ans1:- The outer layer is the tunica adventitia and the thickest layer in veins.

Ans2:- Capillaries. These small blood vessels connect the arteries and the veins. Their thin walls allow oxygen, nutrients, carbon dioxide, and other waste to pass to and from cells.

Ans3:- Veins are the blood vessels that carry blood back to the heart. They may contain valves which stop blood flowing away from the heart. So, the correct option is 'Veins'.

$<marquee behaviour-move><font color="blue black"><h1>#PHENOMENOL</ ht></marquee>$

Answer 2

Answer:

The innermost layer is called the tunica intima. The muscular middle layer is called the tunica media, and the outermost layer is called the tunica adventitia.

1. The middle layer tunica media is the thickest layer in arteries. It consists of circularly arranged elastic fiber, connective tissue, polysaccharide substances

2. Capillaries - Enable the actual exchange of water and chemicals between the blood and the tissues. They are the smallest and thinnest of the blood vessels in the body and also the most common. Capillaries connect to arterioles on one end and venules on the other.

3.Veins are the blood vessels that carry blood back to the heart. They may contain valves which stop blood flowing away from the heart. So, the correct option is 'Veins'.

(hope it will help you and sorry if it is wrong)