2.2.3 Heart & Blood

Question 1

Heart made of?

Answer 1

Cardiac muscle:

• found only in heart
• contracts without receiving nerve impulses from brain

Question 2

What is heartbeat

Answer 2

many heart muscle Cells contract together

-typical heartbeat 70X minute

Question 3

Pulmonary artery

Answer 3

Takes deoxygenated blood to lungs

Question 4

Vena cava

Answer 4

Brings deoxygenated blood into heart

Question 5

Aorta

Answer 5

Carries oxygenated blood around body

Question 6

Pulmonary vein

Answer 6

Brings oxygenated blood from lungs

Question 7

Muscular heart wall

Answer 7

-thicker on left ad has to pump blood around body

Question 8

How much blood in body

Answer 8

5 litres

Question 9

Blood made from

Answer 9

• red blood cells
• white blood cells
• plasma
• platelets

Question 10

Red blood cells

Answer 10

Small, bioconcave disc cells, no nucleus, contain haemoglobin, carry oxygen, fit through capillary one cel at a time

Question 11

White blood cell

Answer 11

Large, have nucleus, fight disease by making antibodies or change shape to engulf microorganisms

Question 12

Plasma

Answer 12

Straw coloured liquid, blood cells float in it, over 90% water,many materials transport by dissolving in plasma, takes excess water from intestine to kidneys to be removed

Question 13

Platelets

Answer 13

Tiny structures, help blood to clot