Top 550+ Solved Physiology MCQ Questions Answer

a. are deiodinated before joining to form T3 and T4

b. are secreted into plasma alongside T3 and T4

c. are the inactive metabolites of T3 and T4

d. are cleaved from thyroglobulin by proteases in lysosomes

e. are usually excreted in the urine

a. gastrin

b. somatostatin

c. oestrogen

d. cholecystokinin

e. glucagon

a. acetylcholine stimulates secretion

b. both G protein and direct calcium channels are involved

c. an H+ - K+ antiport transports H+ into the gastric lumen

d. parietal cells have high levels of carbonic anhydrase

e. acid secretion is maintained at constant levels by local feedback mechanisms

a. red blood cells

b. skeletal muscle

c. cardiac muscle

d. smooth muscle

e. aorta

a. it is stimulated by TSH

b. it depends on Na+ / K+ ATPase activity

c. it pumps iodide into the colloid, after entering the cell down an electrical gradient

d. it pumps iodide against an electrical gradient

e. its activity can be measured with trace doses of radioactive iodine

a. free T3 and T4 exert feedback control on anterior pituitary

b. free T3 and T4 exert feedback control on hypothalamus

c. free T3 and T4 exert feedback control on anterior pituitary and hypothalamus

d. free T3 and T4 do not affect day to day control of their secretion

e. the basal metabolic rate is the most important determinant of thyroid secretion

a. they are large lipoprotein complexes

b. they are part of the exogenous lipid transport system

c. they enter the circulation via the lymphatic ducts

d. they are cleared from the circulation by lipoprotein lipase on the surface of hepatocytes

e. chylomicron remnants are bound to LDL R and endocytosed

a. they contain triglycerides, cholesterol and phospholipids

b. they are formed in the intestinal mucosa

c. they are cleared from the circulation by lipoprotein lipase

d. they are transported to the liver by the portal circulation

e. large numbers after a meal give the plasma a milky appearance

a. liver

b. skin

c. adipose tissue

d. skeletal muscle

e. digestive system

a. chylomicron remnants

b. HDL

c. LDL

d. VLDL

e. none of the above

a. it is a fat soluble vitamin

b. its absorption is inhibited by trypsin

c. it is mainly carried in plasma by attachment to albumin

d. it undergoes enterohepatic circulation

e. none of the above are true

a. HDL transports ingested cholesterol from the intestine

b. HDL transports triglycerides from peripheral tissues

c. HDL receptors on macrophages are called scavenger receptors

d. elevated HDL levels are associated with increased risk of atherosclerosis

e. none of the above are correct

a. they account for less than 10% of total fatty acids in plasma

b. they are complexed with a protein carrier

c. they can be metabolised to CO2 and water in skeletal and cardiac muscle

d. their level in plasma decreases as plasma adrenaline increases

e. they are converted to energy by the citric acid cycle

a. an essential amino acid

b. a polypeptide that tags proteins for degradation

c. a cell membrane glycoprotein

d. a precursor or uric acid

e. none of the above

a. skeletal muscle metabolises mainly glucose

b. the brain accounts for approximately 40% of glucose utilised

c. blood glucose concentrations are higher in women than in men

d. blood glucose levels are maintained initially by hepatic glycogenolysis

e. ketones are absent from plasma