Question

Describe the wall structures of arteries, veins and arteries and explain how these structures help carry out their functions

Answer 1

Answer:

Blood is pumped from the heart in the arteries. It is returned to the heart in the veins. The capillaries connect the two types of blood vessel and molecules are exchanged between the blood and the cells across their walls. Veins contain valves which prevent the backflow of blood.

Answer 2

here is your answer mate

HUMAN BLOOD FLOWS ONLY INSIDE CLOSED BLOOD VESSELS.THE LATTER ARE OF THREE TYPES----

• ARTERIES
• VEINS
• CAPILLARIES.

Explanation:

Arteries -they carry blood coming from heart to various parts of the body.they are tbus called distributing blood vessels.since the blood is thivk and elastic due to thickening of middle tunica media .lunica is media.lumen is narrow valves are absent most arteris are deep seated except a few.empty arteries dont collpase

Veins -they carry blood from various parts of body towards the heart .they are therefore callef collecting blood vessels.blood flow is slow but smooth.internal valves prevent back flow of blood.

CAPILLARIES- they are narrow blood vessels having a singke layered wall which occurs in contact with tissues inside all body organs they are for exchange of materials between blood and body cells.the reverse flow from cells also occurs.

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