Blood Circulation

Question 1

What is the role of arteries in the body

Answer 1

carry oxygen-rich blood from your heart to your body

Question 2

What are arterioles?

Answer 2

Smaller than arteries and connect to the capillaries

Question 3

What do capilaries connect

Answer 3

Connect the arterioles to the veins

Question 4

What is the role of veins

Answer 4

Carry blood back into the heart

Question 5

Why is the muscle layer thicker in arteries

Answer 5

Thicker than veins so that constriction and dilation can occur to control volume of blood.

Question 6

What is the muscle layer like in veins

Answer 6

Relatively thin so it cannot control the blood flow

Question 7

What is the elastic layer like in arteries

Answer 7

Thicker than veins to help maintain blood pressure. The walls can stretch and recoil in response to the heart beat

Question 8

What is the elastic layer like in veins

Answer 8

Relatively thin as the pressure is much lower

Question 9

What is the wall thickness in arteries

Answer 9

Thicker wall than veins to help prevent the vessels bursting due to the high pressure

Question 10

What is the wall thickness like in veins

Answer 10

Thin as the pressure is much lower so there is less risk of bursting. The thinness means the vessels are easily flattened which helps the flow of blood up to the heart

Question 11

What is the pulmonary artery

Answer 11

Carrying deoxygenated blood from the heart to the lungs

Question 12

Why does the artery contain alot of elastic fibres

Answer 12

so they can stretch to accommodate the greater volume if blood without being damaged

Question 13

What does the capillary network link

Answer 13

the arterioles and the venules

Question 14

What is the positive of the capillary diameter being small

Answer 14

blood travels slowly through them giving more opportunity for diffusion to occur

Question 15

What is the muscle layer like in capilaries

Answer 15

No muscle layer

Question 16

What is the elastic layer like in capillaries

Answer 16

No elastic layer

Question 17

What is wall thickness like in capilaires

Answer 17

one cell thick consisting of only a lining layer. This provides a short diffusion distance for exchanging materials between the blood and cell

Question 18

Does capilaries have valves

Answer 18

No

Question 19

What is the muscle layer like in arterioles

Answer 19

Thicker than in arteries to help restrict blood flow into the capillaries

Question 20

What is the elastic layer like in arterioles

Answer 20

Thinner than in arteries as the pressure is lower

Question 21

What is the wall thickness like in arterioles

Answer 21

relatively thick muscular walls because blood pressure in them is high

Question 22

Does the arterioles have valves

Answer 22

No

Question 23

What is the role of veins

Answer 23

Carry blood back towards the heart

Question 24

What is the role of the inferior vena cava

Answer 24

large vein that carries the returning blood from the lower parts of the body to the hearts

Question 25

What is the role of the superior vena cava

Answer 25

large vein that carries the retutning blood form the upper part of the body to the heart

Question 26

What is the semi lunar valves

Answer 26

valves found at frequent intervals throughout the venous system to prevent the back flow of blood

Question 27

What are peripheral arteries

Answer 27

arteries further away from the heart but before the arterioles

Question 28

What do the atrioventricular valves do

Answer 28

control the flow of blood between the chambers of the heart

Question 29

What is the role of the pulmonary aterey

Answer 29

The pulmonary arteries carry blood from the right side of the heart to the lungs.

Question 30

How does fibre low blood chlosteral levels

Answer 30

Lower BMI which reduces BP
Fibre helps to lower absorption of cholesterol and increase excretion of cholesterol

Low cholesterol level reduces the chance of atherocloris