Top 80+ Solved General Physiology MCQ Questions Answer

a. it is only found in nervous tissue

b. Na+/K+ pump does not contribute to the membrane potential

c. its magnitude does not change from tissue to tissue

d. the membrane potential is negative inside in relation to the outside

e. it is mainly caused by leaking Na+/K+ channels

a. is an excitatory mediator in the brain

b. it is formed by decarboxylation of glutamates

c. there are three different classes of GABA receptors

d. it is mostly excreted unchanged in the urine

e. is the main mediator in glutamate metabolism

a. is a carbohydrate

b. is a polypeptide found in intestine and nervous tissue

c. is a beta II amino acid residue mainly found in the liver

d. it is not involved in the neuroendocrine system

e. it is a lipid

a. are not formed from precursors

b. morphine is an example of opioid peptides

c. they form the opioid receptors in the brain

d. are mainly found in the brain and gastrointestinal

e. they are excreted unchanged almost always

a. does not have a reflex arc like somatic nervous system

b. dopamine is the main transmitter

c. cholinergic division of the autonomic nervous system increases activity of the intestinal musculature and increases gastric secretion

d. norepinepherine is metabolised by pseudocholinesterase

e. it is not involved with visceral sensation

a. the greater proportion is present in the arterial system

b. the pulmonary vessels contain 50%

c. the systemic capillaries and arterioles contain 7%

d. the heart contains 20%

e. the aorta contains 20%

a. fluctuates in the aorta between 180 and 20mmHg

b. is approaching 0mmHg at the right atrium

c. is half in the pulmonary arteries of that in the aorta

d. is greater in large veins than the vena cava

e. drops significantly at capillary level

a. during laminar flow, blood moves at greater velocity adjacent to the vessel wall

b. turbulent flow can occur in long straight vessels

c. during turbulent flow, there is less resistance to flow

d. the tendency for turbulent flow increases inversely with the velocity of blood flow

e. turbulent flow does not normally occur in the aorta

a. 40% is in the pulmonary circulation

b. 13% is in the systemic arteries

c. 20% is in the systemic arterioles and capillaries

d. 30% is in the veins

e. none of the above are correct

a. the baroreceptors in the carotid bodies are stimulated when blood pressure increases

b. the Bainbridge reflex causes increase in heart rate

c. the Cushing reflex is a special central nervous system ischaemic response resulting from increased intracranial pressure

d. the maximum firing per change in pressure of the carotid baroreceptors occurs at a mean arterial pressure of 90mmHg

e. the glossopharyngeal nerve is involved in baroreceptor reflex system

a. the membrane becomes hyper-polarised

b. the slope of the pre-potential is decreased

c. acetylcholine decreases conductance to Ca++ via muscarinic receptors

d. acetylcholine increases the permeability of nodal tissues to K+ via muscarinic receptors

e. all of the above are true

a. decreased activity of baroreceptors in the left ventricle

b. increased activity of baroreceptors in the pulmonary circulation

c. increased intracranial pressure

d. expiration

e. increased activity of baroreceptors in the arteries

a. arterioles have a strong muscular wall but can close completely

b. the arterial system contains the greatest volume of blood at any given time

c. the aorta has a greater total cross sectional area than the venae cavae

d. velocity is directly proportional to the cross sectional area of the blood vessel

e. Reynold’s number represents a measure of laminar blood flow

a. systolic blood flow in subendocardial arteries is greater than in the epicardial

b. less than 50% of oxygen is removed during passage when in the resting state

c. the coronary circulation is well supplied by parasympathetic vasodilatory fibres

d. sympathetic vasoconstrictory fibres predominate in epicardial vessels

e. none of the above

a. 20% cells, 50% neurons

b. 24% cells, 50% neurons

c. 24% cells, 70% neurons

d. 30% cells, 70% neurons

e. 30% cells, 90% neurons