Cardiovascular System

A person with blood type B has anti-A agglutinins in their plasma, so he/she cannot receive cells with the A antigen on the RBC. Hence the blood types in choices A, C and D are not suitable.

Sinusoids have the largest gaps (intercellular clefts) between cells.

The “system” is supplied with blood from the aorta. Choice A refers to the pulmonary circulation, B to the coronary circulation and C to the flow of blood through the heart.

A megakaryocyte is the cell that produces the membrane-covered cell fragments known as platelets. It is not a macrophage. A dendrocyte is also known as a Langerhans cell or a granstein cell.

(1/5)⁴ = (0.2)⁴ = 0.0016. Narrowing of arteries has dire consequences for blood flow.

Sinusoids are one type of capillary. Anastomoses are a network of capillaries.

BP promotes the outflow of liquid and solutes from the arterial end, while the blood’s osmotic pressure promotes the inflow of water. That is, these two influences are opposing. Hence 28–20 = 8 mmHg.

The heart (myocardium) is supplied by the coronary circulation.

Diuretics promote the production of urine – which is filtered from blood. Hence blood volume decreases as more urine is produced.