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2. Human blood vessels

Three types:

c. Arteries

d. Veins

e. Capillaries

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a. Arteries

Carry oxygenated blood away from heart Function – transport blood quickly and at high

pressure to the tissue

Structure:– Thick wall to withstand pressure

– Muscular and elastic wall to prevent bursting

– The wall consist of epithelial tissues surrounded by

connective tissue and smooth muscles Branch into smaller vessel called arterioles as they

reach the tissues Arterioles continue to branch and form capillaries.

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b. Capillaries

Thin-walled blood vessels

Respiratory gases, nutrients, waste

products, hormones are exchangebetween the blood and cells through

the thin wall of the capillaries

The wall is one-cell thick

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c. Vein

Carry deoxygenated blood from

tissues to the heart

The wall consist of epithelial tissuessurrounded by smooth muscle

(thinner than that in arteries) and

connective tissues

Have large lumen and valve that

maintain the one-way flow of blood

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Answers

1. Three types; arteries, vein and

capillary