Top 550+ Solved Physiology MCQ Questions Answer

a. defines a linear relationship between wall tension and force of contraction of cardiac muscle

b. is approximated by representing wall tension as preload and force of contraction as afterload

c. predicts greater force of contraction when filling pressure is decreased (eg during shock)

d. is explained by an increased availability of intracellular Ca2+

e. describes heterometric autoregulation

a. D

b. B12

c. A

d. K

a. thiamin

b. riboflavin

c. niacin

d. folate

a. short chain fatty acids

b. calcium

c. vitamin K

d. oligosaccharides

a. the blood vessels are known to have enteric, parasympathetic and sympathetic innervation

b. the myenteric plexus lies between the longitudinal and circular muscle layers

c. parasympathetic supply is via vagal and sacral nerve

d. sympathetic supply is often inhibitory on cholinergic postganglionic fibres

a. luminal peptides

b. vagal discharge

c. luminal acid

d. phenylalanine

a. insulin secretion in response to a carbohydrate meal

b. a trophic effect on colonic mucosa

c. a trophic effect on gastric mucosa

d. pepsin secretion

a. gallbladder contraction

b. increased gastric motility and emptying

c. glucagon secretion

d. secretion of pancreatic juice

a. peripheral chemoreceptors

b. lung stretch receptors

c. basal ganglia

d. pons

e. respiratory muscles

a. left ventricular failure

b. atelectasis

c. pulmonary fibrosis

d. advancing age

e. raised pulmonary capillary wedge pressure

a. V/Q ratio is greatest at the lung apex

b. V/Q ratio is about one at level of third rib when upright

c. ventilation decreases proportionately more than perfusion from base to apex

d. V/Q ratio for whole lung at rest is about 0.8

e. exercise increases the V/Q ratio

a. apical perfusion is less than basal

b. E.coli endotoxin causes venodilatation

c. total pulmonary blood flow increases 3-6 fold during exercise

d. pulmonary vascular resistance increases at small lung volumes

e. in zone 2, pulmonary arterial pressure is greater than alveolar pressure

a. physiological dead space is normally larger than anatomical dead space

b. basal ventilation is greater than apical

c. normal tide volume is about 7ml/kg

d. airway resistance decreases at large lung volumes

e. total pulmonary ventilation can increase by up to 20 fold during exercise

a. tidal volume = 500ml

b. residual volume = 1200ml

c. expiratory reserve volume = 1000ml

d. inspiratory capacity = 3300ml

e. vital capacity = 4800ml

a. oxygen is about 20 times less soluble in blood

b. deoxygenation of blood increase its ability to carry carbon dioxide

c. arterial blood transports about 20% in dissolved form

d. venous blood has higher haematocrit than arterial blood

e. carbamino compounds are formed by reaction with both plasma proteins and Hb