Physiology Of Heart And Circulation

Front 1

Which of the following statements is false

a)most of the total blood volume is contained in veins b)capillaries have a gtr total surface area than any other type of vessel c)exchanges btw blood and tissue fluid occur across the walls of venules d)small arteries and artioles present great resistance to blood flow

Back 1

c) exchanges btw blood and tissue fluid occur across the walls of venules

Front 2

All Arteries in the body contain O2 rich blood except

a)the aorta b)the pulmonary artery c)the renal artery d)the coronary artery

Back 2

b) pulmonary artery

Front 3

the "lub"or first sound is produced by closing of the

a)aortic semilunar valve b)pulmonary semilunar valve c)tricuspid valve d)bicuspid valve e)both AV valves

Back 3

e) both AV valves

Front 4

The first heart sound is produced at the

a)beginning of systole b)end of systole c)begining of diastole d)end of diastole

Back 4

a) beginning of systole

Front 5

Changes in the cardic rate primarily reflect change in the duration of

a)systole b)diastole

Back 5

b) diastole

Front 6

The QRS wave of an ECG is produced by

a)deploarization of the atria b)repolarization of the atria c)depolarization of the ventricles
d)repolariztion of the ventricles

Back 6

c) depolarization of the ventricles

Front 7

The second heart sound directly follows the occurence of the

a)P wave b)QRS wave c)T wave

Back 7

c) T wave

Front 8

The cells that normally have the fastest rate of spontaneous diastolic depolarization are located in the

a)SA node b)AV node c)bundle of His d)Purkinje fibers

Back 8

a) SA node

Front 9

Whic of these statements is true

a)The heart can produce a graded contraction b)The Heart can produce a sustained contraction c)The action potentials produced at each cardiac cycle normally travel in circus rhythms d)All of the myocardial cells in th eventricles are normally in a refractory period at the same time

Back 9

d)All of the myocardial cells in the ventricles are normally in a refractory period at the same time

Front 10

An ischemic injury to the heart that destroys myocardial cells is

a)angina pectoris b) a myocardial infarction c)fibrillation d)heart block

Back 10

b) a myocardial infarction

Front 11

The activation of factor X occurs in the

a)intrinsic pathway b)extrinsic pathway c)both A&B d)neither A&B

Back 11

c)both intrinsic and extrinsic pathways

Front 12

Platelets

a)form a plug by sticking to each other b)release chemicals that stim vasoconstriction c)provide phospholipids needed for the intrinsic pathway d)a.o.t.a

Back 12

d) all

Front 13

Antibodies against both type A and type B antigens are found in the plasma of a person who is

a)Type A b)TypeB c) Type AB d)Type O e) a.o.t.a

Back 13

d) type O

Front 14

Production of which of the following blood cells is stimulated by a hormone secreted by the kidneys

a)lymphocytes b)monocytes c)erythrocytes d)neutrophils e)thrombocytes

Back 14

c) erythrocytes

Front 15

Which of the following about plasmin is true

a)it's involved in the intrinsic clotting system b)it's involved in the extrinsic clotting system c)it functions in fibrinolysis d)it promotes formation of emboli

Back 15

c) functions in fibrinolysis

Front 16

During the phase of isovolumetric relaxation, the pressure in th eventricles is

a)rising b)falling c)first rising then falling d)constant

Back 16

b) falling

Front 17

Peristaltic waves of contraction move fluid within which of thesse vessels

a)arteries b)veins c)capillaries d)lymph vessels e)all

Back 17

d) all

Front 18

Excessive diarrhea may cause

a)respiratory acidosis b)respiratory alkalosis c)metabolic acidosis d)metabolic alkalosis

Back 18

c) metabolic acidosis