blood

Question 1

What does Plasma do?

Answer 1

Carries almost everything your body needs

Red, white blood cells and platelets

digested food products (like glucose and amino acids) from the gut to all of the body cells

C02 from body cells to the lungs

Urea from the liver to the kidneys (removed in urine)

hormones, which act as chemical messengers

heat energy

Question 2

what do platelets do?

Answer 2

Question 3

what do red blood cells do?

Answer 3

Question 4

what does Phagocytes do?

Answer 4

Question 5

what do Lymphocytes do?

Answer 5

Question 6

Why are vaccines important?

Answer 6

when you are infected with a new pathogen it can take your lymphocytes a while to produce the antibodies to deal with it, in that time you can get very ill or even die

Question 7

how does vaccination work?

Answer 7

injecting a dead or inactive pathogen into the body, these carry antigens, so even though there harmless they still trigger an immune response, memory cells will be produced and remain in the blood, so if that live pathogen enters, anti bodies will kill it faster.

Question 8

where do Arteries carry blood?

Answer 8

away from the heart

Question 9

where do capillaries carry blood?

Answer 9

exchange of materials at tissuies

Question 10

where do veins carry blood?

Answer 10

towards the heart

Question 11

Describe and name the adaptations of capillaries?

Question 12

what branch into capillaries?

Answer 12

arteris

Question 13

why do capillaries carry blood really close to every cell in the body?

Answer 13

to exchange substances with them

Question 14

what is the function of Capillaries?

Answer 14

exchange substances - supply food and oxygen and take away wastes like C02

Question 15

List some adaptations of capillaries?

Answer 15

permeable walls, so substances can diffuse in and out.

walls are only one cell thick. this increases the rate of diffusion by decreasing the distance over which it happens.

Question 16

why are artery walls strong and elastic?

Answer 16

because the heart pumps blood at high pressure.

Question 17

what do the elastic fibers allow the artery to do?

Answer 17

expand

Question 18

what makes arteries strong?

Answer 18

the walls are thick compared to the size of the lumen they contain thick layers of muscle.

Question 19

capillaries eventually join up to form?

Answer 19

veins

Question 20

why doesn’t the wall of a vein need to be as thick as an artery?

Answer 20

because the blood is at lower pressure.

Question 21

what adaptation do veins have to help blood flow?

Answer 21

bigger lumen than arteries to help blood flow despite the lower pressure

Question 22

what does a valve do in a vein?

Answer 22

helps keep blood flowing in the right direction.