Circulatory System

Question 1

Arteries Function?

Arteries Structure?

Answer 1

Function: Carry oxygenated blood away from the heart to the bodies cells.

Structure: Thick outer walls, small lumen, high pressure with the exception of the pulmonary arteries.

Question 2

Veins Function?

Veins Structure?

Answer 2

Function: Carry deoxygenated blood towards the heart from the body.

Structure: Valves to prevent back-flow, larger lumen, low pressure and thin outer walls.

Question 3

Capillaries Function?

Capillaries Structure?

Answer 3

Function: Connect arteries and veins, important in the role of exchanging materials between blood and cells, role in gas exchange of oxygen and CO2 within the lungs.

Structure: One cell thick allows for diffusion, very small lumen.

Question 4

Components of blood?

Answer 4

Erythrocytes: Carry oxygen to the bodies cells using haemoglobin (red protein). Biconcave shape with no nucleus.

Leukocytes: Aid the immune system and destroy pathogens. Spherical shape and cells have a nucleus.

Platelets: Thrombocytes, clump together to form blood clots.

Plasma: Transports nutrients to cells and carries hormones and glucose in blood.

Phagocytes: Engulf and absorb bacteria and pathogens.