B4

Question 1

What does the human circulatory system do?

Answer 1

Transport substances to and from the body cells

Question 2

What makes up the human circulatory system?

Answer 2

Blood,blood vessels and the heart

Question 3

What does plasma do?

Answer 3

Transport proteins and other chemicals around the body

Question 4

What is suspended in plasma?

Answer 4

Blood cells

Question 5

What do red blood cells contain that binds oxygen to transport it from the lungs to the tissues?

Answer 5

Haemoglobin

Question 6

What do white blood cells do?

Answer 6

Protect the body against infection

Question 7

What are platelets?

Answer 7

Cell fragments that start the clotting process at wound sites

Question 8

What does plasma carry?

Answer 8

Red blood cells
White blood cells
Platelets

Question 9

How does blood flow around the body?

Answer 9

Through blood vessels

Question 10

What are the 3 main types of blood vessel?

Answer 10

Arteries
Veins
Capillaries

Question 11

Where do substances diffuse in and out of the blood in?

Answer 11

Capillaries

Question 12

What do valves prevent and ensure?

Answer 12

They prevent back flow ensuring that blood flows in the right direction

Question 13

What are the 2 parts of a double circulatory system?

Answer 13

1 part carry’s blood from your heart to your lungs and back again
The other part carry’s blood from your heart to all other organs of your body and back again

Question 14

Do arteries carry blood to or from the heart?

Answer 14

Away from the heart

Question 15

Do veins carry blood to or from the heart?

Answer 15

To the heart

Question 16

How many chambers does the heart have?

Answer 16

4

Question 17

What is the heart?

Answer 17

An organ that pumps blood around the body

Question 18

What do the valves in the heart do?

Answer 18

Keep blood flowing in the right direction

Question 19

What can stents be used for?

Answer 19

Keep narrowed or blocked arteries open

Question 20

What do statins do?

Answer 20

Reduce cholesterol levels in the blood, reducing the risk of coronary heart disease

Question 21

What is the function of the ventricle in the heart?

Answer 21

To pump blood out of the heart

Question 22

What can replace damaged heart valves?

Answer 22

Biological or mechanical valves

Question 23

What is the resting heart rate controlled by?

Answer 23

A pacemaker

Question 24

Where is the pacemaker for the heart found?

Answer 24

The right atrium

Question 25

What seperates the lungs and the abdomen?

Answer 25

The diaphragm

Question 26

What do the alveoli provide?

Answer 26

A large surface area and a rich supply of blood capillaries

Question 27

What does alveoli allow to happen more efficiently?

Answer 27

Gases can diffuse into and out of the blood

Question 28

What are plant tissues?

Answer 28

Collections of cells specialised to carry out specific functions

Question 29

What do epidermal tissues do?

Answer 29

Cover the surfaces and protect them

Question 30

What does palisade mesophyll tissue do?

Answer 30

Contains lots of chloroplast which carry out photosynthesis

Question 31

What does spongy mesophyll do?

Answer 31

Has big air spaces and a large surface area to make diffusion of gases easier

Question 32

What does xylem do?

Answer 32

Carry water and dissolved mineral ions from the roots up to the leaves

Question 33

What does the phloem do?

Answer 33

Carry dissolved food from the leaves around the plant

Question 34

What does phloem transport?

Answer 34

The sugars made by photosynthesis

Question 35

What is translocation?

Answer 35

The movement of dissolved sugars from the leaves to the rest of the plant

Question 36

What is transpiration?

Answer 36

The loss of water vapour from the surface of plant leaves

Question 37

What affects the rate of transpiration?

Answer 37

Anything that effects the rate of evaporation

Question 38

Why does evaporation affect transpiration?

Answer 38

Because when water is evaporated of the surface of leaves transpiration occurs to refill that water on the surface

Question 39

What do the stomata and guard cells control?

Answer 39

Gas exchange and water loss

Question 40

What factors increase the rate of transpiration?

Answer 40

Temperature, humidity, air flow and light intensity

Question 41

When is transpiration faster?

Answer 41

In hot, dry, windy or bright conditions