arteries veins and capillaries

Question 1

summaries our circulatory system

Answer 1

blood is pumped from the heart to the lungs where it collects oxygen
the blood then returns to the heart and is pumped around the whole body where it delivers the oxygen to the body cells

Question 2

what do arteries do?

Answer 2

carry very high blood pressure blood from the heart to the organs of the body

Question 3

Structure of arteries

describe a property and it’s function

Answer 3

have very thick muscular walls

this allows them to withstand the very high pressure of the blood

Question 4

how does blood travel through the arteries?

Answer 4

blood travels through the arteries in surges every time the heart beats(that surge can be felt in the wrist as your pulse)

Question 5

correctly label an artery diagram

Answer 5

• thick wall
• muscle
• elastic fibres
• capillaries

Question 6

name the function of elastic fibres.

Answer 6

they stretch when the surge of blood passes through and then recoil in between surges, which keep the blood moving

Question 7

once blood is in the organs, the blood flows through the…

Answer 7

capillaries

Question 8

what happens as blood passes through the capillaries?

Answer 8

substances such as glucose and oxygen diffuse from the blood to the cells
carbon dioxide diffuses from the cells back to the blood

Question 9

why might the diffusion path of capillaries be short

Answer 9

have very thin walls

Question 10

the diffusion path of capillaries are short.

why might this be beneficial?

Answer 10

the thin membrane allows substances to diffuse rapidly between the blood and the body cells

Question 11

once the blood has passed through it’s organs, it now makes its way back where and how.

Answer 11

back to the heart in veins

Question 12

name a problem present when the blood travels back to the heart in veins

Answer 12

the blood is now travelling slowly and at LOW PRESSURE. That means that it could stop or even go backwards.

Question 13

name a Structure of veins are

reason for this structure:

Answer 13

Valves to stop blood from flowing backwards

OR

veins have a thin wall this is because
the blood pressure is low so the wall doesn’t need to be thick

Question 14

name a Structure of veins and reason for structure

Answer 14

Valves to stop blood from flowing backwards

OR

veins have a thin wall this is because
the blood pressure is low so the wall doesn’t need to be thick

Question 15

when do valves open?

Answer 15

when the blood is flowing in the right direction then the valves open to allow the blood to flow through

Question 16

what happens to the valves when the blood flows backwards?

Answer 16

they shut