GCSE BIOLOGY B4

Question 1

Components of blood

Answer 1

Based on a liquid called plasma, carries red and white blood cells, and platelets.
Avg person has 5l of blood in them.

Question 2

Red blood cells

Answer 2

5mil in each cubic mm of blood. Pick up oxygen from the air in your lungs and carry it to the cells where its needed
Are biconcave discs
Packed with a red pigment called haemoglobin
Have no nucleus

Question 3

White blood cells

Answer 3

Bigger than red blood cells, but fewer of them, have a nucleus
Form part of the bodies defence system against harmful organisms

Question 4

Platelets

Answer 4

Are small fragments of cells, have no nucleus, important to help the blood clot at the site of a wound

Question 5

Blood vessels

Answer 5

Arteries, veins and capillaries

Question 6

Arteries

Answer 6

Carry blood away from your heart to the organs of your body. High oxygenated blood

Question 7

Veins

Answer 7

Carry blood away from the organs to the heart, low oxygenated blood

Question 8

Cappillaries

Answer 8

Form a huge network of tiny vessels linking arteries and veins

Question 9

Double circulation

Answer 9

a circulatory system in which the blood makes two distinct circuits — compare pulmonary circulation, systemic circulation.

Question 10

Heart

Answer 10

look at diagram in photos

Question 11

Leaky valves

Answer 11

Heart valves withstand a lot of pressure and over time they become stiff and dont open fully, making the heart less efficient

Question 12

Artificial pacemakers

Answer 12

Replaces the original pacemaker if its not going at 70bpm, or when its damaged

Question 13

Artificial heart

Answer 13

Replaces the heart with heart is damaged, controlled with air pressure