The Circulatory System

Question 0

How does blood flow to and from the heart?

Answer 0

1. ) deoxygenated blood enters the heart via the vena cava.
2. ) it then enters the right atrium
3. ) then the right ventricle
4. ) then it goes out of the heart via the pulmonary Artery (Away from the heart)
5. ) it is pumped to the lungs where gaseous exchange takes place and it is pumped back to the heart.
6. ) the now oxygenated blood enters the pulmonary veIN (INto the heart)
7. ) enters the left atrium
8. ) enters the left ventricle
9. ) and leaves the heart via the Aorta to be pumped around the body to the muscles.

10.) the cycle then repeats when the now deoxygenated blood enters the vena cava.

Question 1

What are the functions of the circulatory system?

Answer 1

• transport: carries blood, water, nutrients, oxygen and co2 and the body.
• protection: White blood cells/ antibodies that fight infection are carried in the blood. And platelets are also carried which enables blood to clot to seal wounds.
• temperature: it is regulated by the blood absorbing heat and carrying it to the skin and lungs where it is released

Question 2

What are the three blood vessels?

Answer 2

Arteries, veins and capillaries

Question 3

Describe arteries

Answer 3

• thick walls
• carries oxygenated blood away from the heart through the aorta
• high pressure
• no valves
• quite elastic walls
• pulse can be located here

Question 4

Describe veins

Answer 4

• carry deoxygenated blood back to the heart
• thin walls
• less elastic walls
• they have valves that stop the blood flowing backwards

Question 5

Describe capillaries

Answer 5

• microscopic
• link arteries to the veins
• very thin walls to allow diffusion of gas

Question 6

What is your heart rate?

Answer 6

The number of times your heart beats in one minute

Question 7

What is your pulse?

Answer 7

A recording of the rate per minute at which the heart beats