D2) Function of the cardiovascular system

Question 1

Delivery of oxygen & nutrients

Answer 1

Supply oxygen to the tissues
Supply nutrients to the tissues- done via the bloodstream

Question 2

Removal of waste products- carbon dioxide & lactate

Answer 2

Waste products from the tissue to kidneys & liver
CO2 to the lungs

Question 3

Thermoregulation

Answer 3

Exercise- change in blood flow
CV system maintains thermal balance during exercise by distribution & redistribution of heat

Question 4

Vasodilation

Answer 4

Increases diameter of blood flow allowing more blood flow to pass through
Occurs in arterioles:
Increasing blood supply to the working muscles
Blood vessels near the surface of the skin to release heat

Question 5

Vasoconstriction

Answer 5

Decreases the diameter of blood vessels reducing blood flow to tissue
Occurs in arterioles:
Decreasing the blood supply to tissue
Of the blood vessels near the surface of the skin to retain heat

Question 6

Fight infection

Answer 6

Leucocytes
Fight infection
Part of the immune system
Destroy & engulf bacteria & viruses

Question 7

Erythrocytes

Answer 7

Red blood cells
Contain a protein- haemoglobin- carries O2 to tissue- oxyhaemoglobin

Question 8

Clotting blood- platelets

Answer 8

Parts of cells
Stop blood loss by creating- clot/plug
Becomes sticky when it comes into contact with air
Initial stages of repairing the damaged tissue
Plasma- coagulation factors- form fibrin- strengthens the platelet plug trapping RBC, WBC & plasma to repair the wound