Blood

Question 1

Blood plasma

Answer 1

-Yellow liquid

Transports dissolved substances in the blood e.g. Waste co2, products of digestion, hormones.

Question 2

Platelets

Answer 2

• Small fragments of cell with no nucleus.
• Helps form blood clots.
• Along with the fribrinogen to fibrin reaction help to seal wounds.
• All its reactions are controlled by enzymes.

Question 3

Red blood cells

Answer 3

• Biconcave discs with no nucleus, hollow to store oxygen, small to provide large surface area to volume ratio.
• Contains the protein haemoglobin.
• Haemoglobin binds with oxygen, and is carried round the body in the form of oxyhemoglobin.

Question 4

White blood cells

Answer 4

• No set shape, fewer and bigger than red blood cells.
• Has a nucleus.
• Fights pathogens, as phagocytes (engulf), and lymphocytes (antibodies trap).

Question 5

Arteries

Answer 5

• Transports blood away from the heart, as it’s under a lot of pressure.
• Aorta transports oxygenated blood to the body.
• Pulmonary artery transports deoxygenated blood to the lungs.
• Has no valves.

Question 6

Veins

Answer 6

• Transports blood around the body to the heart.
• Under less pressure than arteries.
• Has valves to keep direction of flow set.
• Vena carvae carries deoxygenated from body to heart
• Pulmonary vein carries oxygenated blood from the lungs.

Question 7

Capillaries

Answer 7

• One cell thick to allow diffusion and other movements to take place.
• Very low pressure
• Where gas exchange takes place.
• No valves

Question 8

Coronary arteries/veins

Answer 8

• The heart receives its own supply of blood from the coronary arteries.
• There are two main coronary arteries branching from the aorta.
• They supply oxygen rich blood to the heart muscle.