Physiology MCQs

Primary haemostasis is formation of a platelet plug at a site of vascular injury.

Vestibulo-ocular reflex is a reflex that stabilises gaze during head movement by producing compensatory eye movement.

Glomerular filtration rate is the volume of plasma filtered by all functioning glomeruli per unit time.

Surfactant is a phospholipid-rich substance that lowers alveolar surface tension and helps prevent collapse.

Bohr effect is reduced haemoglobin affinity for oxygen in tissues with increased carbon dioxide or acidity.

Insulin is a pancreatic beta-cell hormone that promotes glucose uptake and storage and lowers blood glucose.

Aldosterone is a mineralocorticoid that increases renal sodium reabsorption and potassium secretion.

Countercurrent multiplier is a loop-of-Henle mechanism that establishes the medullary osmotic gradient for urine concentration.

Baroreceptor reflex is a rapid autonomic response that buffers short-term changes in arterial blood pressure.

Action potential refractory period is a period that limits immediate re-excitation of an excitable membrane after depolarisation.

Parathyroid hormone is a hormone that raises plasma calcium through bone, kidney and vitamin-D related effects.

Primary haemostasis is formation of a platelet plug at a site of vascular injury.