Circulatory System

Question 1

Blood Vessels

Answer 1

Veins - bring blood to heart
Arteries- bring blood away from heart
Capillaries - let gases pass through them

Question 2

Blood

Answer 2

4 components 
Plasma
Red blood cells
White blood cells
Platelets

Question 3

Plasma

Answer 3

Liquid part of blood
Pale yellow
Mostly water
Transports materials and heat around the body

Question 4

Red blood cells

Answer 4

Made in bone marrow (centre of bones) 
Contains haemoglobin- red coloured pigment 
Need iron to make haemoglobin
Carries oxygen 
45% of blood composition 
No nucleus 
Small and rubbery.

Question 5

White blood cells

Answer 5

Made in bone marrow
Fights infection
Surrounds microorganisms and destroys them
Forms proteins called antibodies to destroy microorganisms
7% of blood composition
Has nucleus
Are large

Question 6

Platelets

Answer 6

Formed in bone marrow when large cells break down to smaller irregular fragments of cells
Help form blood clots
Prevent blood loss 
Prevent microorganisms entering body
Less than 1% of blood composition

Question 7

Arteries

Answer 7

Carry blood away from heart
Strong blood flow-high pressure
Thick walls

Question 8

Veins

Answer 8

Carry blood to heart
Blood floe -low pressure
Thinner walls
Valve - to prevent back flow

Question 9

Capillaries

Answer 9

Tiny blood vessels
Found between arteries and veins
Huge no in body
Gases exchanged

Question 10

Heart

Answer 10

Size of clenched fist
Between middle and left side of chest
Cardiac muscle-strong, doesn’t tire easily
Contracts to pump blood around body via blood vessels
Force of blood causes pulse.