blood

Question 1

name the protein in blood that is responsible for transporting oxygen

Answer 1

haemoglobin

Question 2

name one type of animal cell that does not have mitochondria

Answer 2

red blood cell

Question 3

what word is used to describe the shape of the two faces of these cells

Answer 3

biconcave

Question 4

what feature of red blood cells allows them to pass through the narrow capillaries

Answer 4

flexible

Question 5

human red blood cells live for about 120 days, give a reason for this

Answer 5

no nucleus

Question 6

give a location in the body where red blood cells are produced ed

Answer 6

red bone marrow

Question 7

give a location in the body where red blood cells are usually broken down

Answer 7

liver

Question 8

name the transport fluid in humans that does not contain red blood cells

Answer 8

lymph

Question 9

name two substances that are transported in the blood

Answer 9

oxygen
proteins

Question 10

give the location in the body where each of the substances (oxygen and protein) enters the blood

Answer 10

oxygen - lungs
protein - liver

Question 11

state two ways in which red blood cells differ from white blood cells

Answer 11

white blood cells contain a nucleus, red blood cells dont contain a nucleus
red blood cells are biconcave, white blood cells are not biconcave

Question 12

name a group of white blood cells,

Answer 12

monocytes

Question 13

what is the role of antibodies in the body

Answer 13

to inactivate antigens

Question 14

name any three types of T cell

Answer 14

helper, killer, suppressor

Question 15

state a role of helper

Answer 15

activate killer cell

Question 16

state a role of killer

Answer 16

attack infected cells

Question 17

state a role of suppressor

Answer 17

stop immune responses

Question 18

write a short note on the pulse

Answer 18

rate at which the heart beats

Question 19

write a short note on blood pressure

Answer 19

force exerted by the blood against the walls of the blood vessels

Question 20

comment on the effect of diet on the circulatory system

Answer 20

salt - high salt intake causes high blood pressure

Question 21

comment on the effect of exercise on the circulatory system

Answer 21

excursive enlarges and strengthens the heart

Question 22

give two ways in which red blood cell differs in structure or composition from a typical body cell

Answer 22

flexible, biconcave

Question 23

what is the role of the SA node in the heart

Answer 23

pulses and causes the atria to contract

Question 24

what is the role of the AV node in the heart

Answer 24

sends an impulse down special muscle fibres located in the septum

Question 25

give the precise location for the SA node

Answer 25

wall of right atrium

Question 26

give the precise location for the AV node

Answer 26

septum