Top 550+ Solved Physiology MCQ Questions Answer

a. ventricular contractility

b. arterial pressure

c. end diastolic volume of ventricle

d. blood viscosity

e. right ventricle compared to left

a. kinetic energy = M.V2(mass x velocity2)2

b. hydrostatic (gravitational) pressure = potential energy

c. the pressure in a foot vein may be 150 cm??? greater than at aortic root (in upright posture)

d. the same pressure differential applies in arterial system, (in upright posture)

e. the greatest pressure drop occurs in the capillaries

a. 3% in LV and aorta

b. 15% in arterial system

c. 7% in capillaries

d. 50% in venous system (systemic)

e. 40% in pulmonary circulation

a. lateral (static) pressure is reduced but prolonged by elastic arteries

b. static pressure increases with gravitation (hydrostatic) pressure increases

c. static pressure does not include kinetic energy

d. greater resistance to flow through a segment of circulation leads to greater loss of energy through that segment

e. kinetic energy becomes more significant in a narrowed segment and converts back to potential energy when the tube widens

a. flow is proportional to pressure gradient

b. flow is inversely proportional to resistance

c. Poiseville’s Law relates flow to pressure gradient and factors that influence resistance

d. Poiseville’ Law demonstrates that resistance to flow is largely determined by viscosity and length of tube and radius x 4

e. if radius of a vessel is halved, the flow may be reduced to 1/16th of previous flow

a. increased heart rate

b. increased blood volume

c. pressure rises in increased cardiac output until the amount entering the arterial system equals the amount leaving

d. increased total peripheral resistance

e. increased end systolic volume

a. M.A.P. = pulse pressure / 2 + diastolic pressure

b. elastance increases progressively with age

c. increase in arterial blood pressure causes a subsequent increase in stroke volume

d. increased sympathetic stimulation may sometimes lead to decreased cardiac output

e. pulse pressure increases with age because of decreased arterial elastance

a. at increased heart rates, diastole is shortened more than systole

b. the pericardial sac normally contains about 50ml of fluid

c. during the cardiac cycle, left ventricular ejection begins before right ventricular ejection

d. during expiration, the aortic valve closes before the pulmonary valve

e. the end—diastolic ventricular volume is about 170ml

a. velocity is greatest closest to blood vessel walls

b. turbulence is almost always present at a Reynold’s number greater than 2,000

c. probability of turbulence in a vessel is directly related to twice the radius

d. flow in vessels is directly related to the fourth power of the ?????

e. turbulence is related to increasing radius

a. increased total blood volume

b. increased venous tone

c. increased pumping action of skeletal muscle

d. increased negative intrathoracic pressure

e. increased intrapericardial pressure

a. aortic stenosis

b. anaemia

c. mitral insufficiency

d. tricuspid stenosis

e. normal flow in children

a. right atrial systole begins after left atrial systole

b. the pulmonary closes after the aortic in inspiration

c. right ventricular ejection starts after left ventricular ejection

d. right ventricular systole starts after left ventricular systole

e. right and left atrial systole are synchronous

a. is an example of hetermeric regulation

b. is an example of homomeric regulation

c. is explained by troponin / tropomyosin overlap

d. relates stroke volume to cardiac output

e. bears little relation to in vivo regulation of the heart

a. A

b. B

c. O

d. AB

e. ABO

a. increases calcium inflow to the SA node

b. decreases calcium inflow to the AV node

c. increases potassium outflow in the SA node

d. increases potassium outflow in the AV node

e. decreases potassium outflow in the SA node