Soc 15- The Cardiovasucalar System

Question 1

What is the cardiovascular system?

Answer 1

Formed by our heart and blood vessels.
Cardio means heart. Vascular means blood vessels

Question 2

What are the three funtions of the cardiovascular system?

Answer 2

Transports oxygen, carbon dioxide and nutrients
- pumps oxygen round the body, respiration and energy
Helps clot the blood
- contains platelets which form scabs and help stop bleeding
Controls body temp.
-too hot,blood vessels close to skin get bigger (vasodilation) allow heat radiate out
- too cold, blood vessles get smaller (vasoconstriction) avoid heat lost

Question 3

What is vasodilation?

Answer 3

Veins swell up and dilate, blood vessels allow increased blood flow

Question 4

What is vasoconstriction?

Answer 4

Veins shrink down and blood vessels decrease blood flow

Question 5

What is vascular shunting?

Answer 5

Increases blood flow to active areas during exercise by diverting blood away from inactive areas this is archieved by vasodilation and vasoconstriction.

Question 6

What hormone does your body release to bring a change to your heartrate

Answer 6

Adrenaline