The Heart and Blood Vessels (capillaries)

Question 1

What are capillaries?

Answer 1

They are tiny, much-branched vessels

Question 2

What are tiny, much-branched vessels called?

Answer 2

Capillaries

Question 3

What are the walls of capillaries made of?

Answer 3

A single layer of endothelium cells

Question 4

What do capillaries allow the exchange of between the blood and body cells?

Answer 4

Materials

Question 5

What do capillaries allow the exchange of materials between?

Answer 5

The blood and body cells

Question 6

How do capillary walls allow for the exchange of materials between the blood and body tissues?

Answer 6

Their walls are permeable

Question 7

Approximately how many capillaries does the body have?

Answer 7

Approximately 100,000 km worth of capillaries

Question 8

What are located close to every body cell?

Answer 8

Capillaries

Question 9

There is a capillary located close to every cell in the human body, how is this useful in the exchange of materials?

Answer 9

There are too few arteries and veins to be close enough to every body cell to allow for the exchange of materials whereas there will always be a capillary close to a body cell due to how numerous they are.