The structure and function of arteries, capillaries and veins

Question 1

Describe the proceess of blood circulation

Answer 1

Arteries - Capillaries- Veins

Question 2

What happens as blood moves away from the heart

Answer 2

There is a decrease in blood pressure

Question 3

Describe the structure of The Artery

Answer 3

1. Arteries have an outer layer of connective
   tissue containing elastic fibres
2. middle layer containing smooth muscle with more
   elastic fibres.
   3.The elastic walls of the arteries
   stretch and recoil to accommodate the surge
   of blood after each contraction of the heart.

Question 4

Describe the structure of The Vein

Answer 4

1. Veins have an outer layer of connective
   tissue containing elastic fibres but a much
   thinner muscular wall than arteries.
2. They contain valves to prevent the backflow of
   blood.

Question 5

Describe the structure of The Capillary

Answer 5

Capillaries allow exchange of substances
with tissues through their thin walls.

Question 6

How does arterys control blood flow

Answer 6

the smooth muscle surrounding arteries can contract causing vasoconstriction or relax causing vasodilation.

Question 7

Describe 5 stages of Pressure Filtration

Answer 7

1. causes plasma to pass
   through capillary walls into the tissue fluid
   surrounding the cells.
2. Tissue fluid supplies cells with glucose, oxygen and other substances.
3. Carbon dioxide and other metabolic wastes diffuse out of the cells and into the tissue fluid to be excreted.
4. Much of the tissue fluid returns to the blood.
5. Lymphatic vessels absorb excess tissue fluid and return it as lymph to the circulatory
   system.

Question 8

What substance is too large to be filted through the capillary walls.

Answer 8

Plasma proteins