MICROANATOMY

Detailed explanation-1: -Capillaries, the smallest and most numerous of the blood vessels, form the connection between the vessels that carry blood away from the heart (arteries) and the vessels that return blood to the heart (veins). The primary function of capillaries is the exchange of materials between the blood and tissue cells.

Detailed explanation-2: -Continuous capillaries are generally found in the nervous system, as well as in fat and muscle tissue. Within nervous tissue, the continuous endothelial cells form a blood brain barrier, limiting the movement of cells and large molecules between the blood and the interstitial fluid surrounding the brain.

Detailed explanation-3: -Venules are microscopic vessels that continue from the capillaries and merge to form veins.

Detailed explanation-4: -Capillaries are so tiny that we can only see them with a microscope-they are thinner than a hair and smaller than a dot on a piece of paper.

Detailed explanation-5: -Capillaries surround body cells and tissues to deliver and absorb oxygen, nutrients, and other substances. The capillaries also connect the branches of arteries and to the branches of veins. The walls of most blood vessels have three distinct layers: the tunica externa, the tunica media, and the tunica intima.