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Blood vessel structure and functionThe two-way exchange of substances between blood and the body occurs through what vessels?Why do the above vessels permit the diffusion of materials whereas arteries and veins do not (what is it about their structure that matches their function)?Why are valves located in veins, but not arteries?

Question

Blood vessel structure and function
The two-way exchange of substances between blood and the body occurs through what vessels?
Why do the above vessels permit the diffusion of materials whereas arteries and veins do not (what is it about their structure that matches their function)?
Why are valves located in veins, but not arteries?

check_circleAnswer
Step 1

The essential part of circulatory system that helps in transportation of blood throughout the body surface is known as blood vessel. There are three major types of blood vessels, namely the arteries, the veins, and the capillaries.

The arteries and veins have three layers. Those are as follows:

  • Inner layer (tunica intima): It is the thinnest layer among all and consists of single layer of flat simple squamous epithelium connected by polysaccharide intercellular matrix.
  • Middle layer (tunica media): It is the thickest layer in arteries as compared to veins. It consists of elastic fiber, connective tissue, and polysaccharide substances; that are circularly arranged and the second and third layer are separated by thick external elastic lamina.
  • Outer layer (tunica adventitia): It is the thickest layer in veins and entirely made of connective tissue. This layer also has the nerve cells that supply the vessel as well as nutrient capillaries in the larger blood vessels.

Capillaries consist of multiple layers of endothelium and occasional connective tissue.

Step 2

Function of blood vessels:

  • Transport of blood throughout the body.
  • Arteries help in distribution of nutrients, gases with the movement of blood under high pressure.
  • Arteries help in maintaining the arterial blood pressure.
  • Capillaries serve as exchange vessels for nutrients and waste materials.
  • Veins collect the blood for return to the heart and considered as low-pressure vessels.
Step 3

The two way exchange of substances between blood and the body occurs through capillaries. Capillaries are the unique structure that contains only the tunica inti...

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