Human Physiology Test Your Knowledge Chapter 13

which of these statements is false?
A. Most of the total blood volume is contained in veins
B. Capillaries have a greater total surface area than any other type of vessel
C. Exchanges between blood and tissue fluid occur across the walls of venues
D. Small arteries and arterioles present great resistance to blood flow

C

All arteries in the body contain oxygen-rich blood with the exception of
A. The aorta
B. The pulmonary artery
C. The renal artery
D. The coronary artery

B

The "lub", or first heart sound, is produced by closing of
A. The aortic semilunar valve
B. The pulmonary semilunar valve
C. The tricuspid valve
D. The bicuspid valve
E. Both AV valves

E

The first sound is produced at
A. The beginning of systole
B. The end of systole
C. The beginning of diastole
D. The end of diastole

A

Changes in the cardiac rate primarily reflect changes in the duration of
A. Systole
B. Diastole

B

The QRS wave of an ECG is produced by
A. Depolarization of the atria
B. Repolarization of the atria
C. Depolarization of the ventricles
D. Repolarization of the ventricles

C

The second heart sound immediately follows the occurrence of
A. The P wave
B. The QRS wave
C. The T wave
D. None of these

C

The cells that normally have the fastest rate of spontaneous diastolic depolarization are located in
A. The SA node
B. the AV node
C. The bundle of HIS
D. The Purkinje fibers

A

Which 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 around the heart in circus rhythms
D. All of the myocardial cells in the ventricles are normally in a refractory period at the same time

D

An ischemic injury to the heart that destroys myocardial cells is
A. Angina pectoris
B. A myocardial infarction
C. Fibrillation
D. Heart block

B

The activation of factor X occurs in
A. The intrinsic pathway only
B. The extrinsic pathway only
C. Both the intrinsic and extrinsic pathways
D. Neither the intrinsic nor extrinsic pathway

C

Platelets
A. form a plug by sticking to each other
B. Release chemicals that stimulate vasoconstriction
C. Provide phospholipid needed for the intrinsic pathway
D. Serve all of these functions

D

Antibodies against both type A and type B antigens are found in the plasma of a person who is
A. Type A
B. Type B
C. Type AB
D. Type O
E. Any of these types

D

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

C

Which of these statements about plasmin is true?
A. It is involved in the intrinsic clotting system
B. It is involved in the extrinsic clotting system
C. It functions in fibrinolysis
D. It promotes the formation emboli

C

During the phase of isovolumetric relaxation of the ventricles, the pressure in the ventricles is
A. Rising
B. Falling
C. First rising, then falling
D. Constant

B

Peristaltic waves of contraction move fluid within which of these vessels?
A. Arteries
B. Veins
C. Capillaries
D. Lymphatic Vessels
E. All of these

D