Blood and the circulation

Question 1

what is plasma made up from?

Answer 1

white and red blood cells and platelets.

Question 2

What does plasma do?

Answer 2

transports various chemicals around the body.

Question 3

what chemicals does plasma transport around the body?

Answer 3

producs of digestion, hormones, antibodies, urea and carbon dioxide.

Question 4

what do red blood cells contain?

Answer 4

haemoglobin

Question 5

what is haemoglobin?

Answer 5

binds to oxygen to transport it from the lungs to the tissues and cells, which it needs for respiration.

Question 6

what do red blood cells not contain?

Answer 6

a nucleus

Question 7

what is the shape of a red blood cell?

Answer 7

biconcave disks

Question 8

what is the purpose of white blood cells?

Answer 8

help to protect the body against infection

Question 9

true of false: white blood cells can change shape.

Answer 9

True! they can change shape to squeeze out of blood vessels and into the tissues.

Question 10

what are platlets?

Answer 10

fragments of cells which collect at wounds and trigger blood clotting

Question 11

how does blood pass around the body?

Answer 11

in blood vessels

Question 12

what 3 blood vessels does the body contain?

Answer 12

arteries, veins and capillaries.

Question 13

what do the arteries do?

Answer 13

they take blood from your heart to your organs

Question 14

What are arteries made from?

Answer 14

thick walls that are made from muscle and elastic fibres.

Question 15

what do the veins do?

Answer 15

they take blood from your organs to your heart.

Question 16

what are veins made from?

Answer 16

thinner walls and valves to prevent backflow.

Question 17

what do capillaries do?

Answer 17

they allow substances needed by the cells to pass out of the blood. they also allow substances produced by the cells to pass into the blood.

Question 18

what are capillaries made from?

Answer 18

narrow thin walled blood vessels.

Question 19

what does the heart use to pump blood around the body?

Answer 19

double circulatory system

Question 20

how many times does the blood circulate through the heart?

Answer 20

twice

Question 21

what are the four chambers in the heart

Answer 21

the left and right atria, and the left and right ventricles.

Question 22

what does the left and right atria do?

Answer 22

they recieve blood from the veins

Question 23

what does the left and right ventricles do?

Answer 23

They pump blood out into arteries

Question 24

What is the use of valves?

Answer 24

They make sure the blood flows in the correct direction

Question 25

How does the heart send blood to the lungs?

Answer 25

Via the pulmonary artery

Question 26

What does bronchi form when they divide?

Answer 26

They form bronchioles

Question 27

How is the blood taken back to the heart

Answer 27

Through the pulmonary vein