The Circulatory and Respiratory Systems

Question 1

What is the function of red blood cells (erythrocytes)?

Answer 1

Carry oxygen around body

Question 2

What is haemoglobin?

Answer 2

Contains iron, binds to oxygen to give red colour

Question 3

What is the function of white blood cells (leukocytes)?

Answer 3

Defend body from disease/infection, lymphocytes produce anti-bodies and initiate immune response

Question 4

What is the function of platelets?

Answer 4

Stop bleeding by clotting the blood, help body repair

Question 5

What is plasma?

Answer 5

Liquid part of the blood for material transport

Question 6

What are the 3 main blood vessels?

Answer 6

Arteries, veins, capillaries

Question 7

What do arteries do?

Answer 7

Carry oxygenated blood AWAY from heart

Question 8

What do veins do?

Answer 8

Carry deoxygenated blood TOWARDS heart

Question 9

What is the largest artery?

Answer 9

Aorta

Question 10

What is the largest vein?

Answer 10

Vena cava

Question 11

What is the purpose of valves?

Answer 11

Open and close due to pressure changes, to stop the backflow of blood

Question 12

We have a double circulatory system. What does this mean?

Answer 12

Blood travels through 2 circuits; pulmonary and systematic

Advantages: decreased pulmonary pressure, oxygenated and deoxygenated blood kept separate, more efficient

Question 13

What are the 2 different phases of the Cardiac Cycle?

Answer 13

Systole and diastole