Circulatory system 2 Flashcards
The period of time in which the myocardium is insensitive to further stimulation is called the Select one: a. absolute refractory period. b. hyperpolarization period. c. AV period. d. SA period. e. ectopic focus.
a. absolute refractory period.
The volume of blood pumped during each cardiac cycle is the Select one: a. stroke volume. b. cardiac output. c. cardiac reserve. d. end-systolic volume. e. end-diastolic volume.
a. stroke volume
These vessels empty blood into the left atrium. Select one: a. aorta b. right atrium c. pulmonary trunk d. pulmonary arteries e. pulmonary veins
e. pulmonary veins
The valve located between the right ventricle and the pulmonary trunk is the Select one: a. aortic semilunar valve. b. pulmonary semilunar valve. c. tricuspid valve. d. mitral valve. e. bicuspid valve.
b. pulmonary semilunar valve.
Which of the following is true?
Select one:
a. Blood enters the right and left atria only during diastole.
b. Most ventricular filling occurs before the atria contract.
c. During ventricular systole, the AV valves open.
d. The semilunar valves remain closed throughout ventricular systole.
e. Most of end-diastolic volume comes from active filling.
e. Most of end-diastolic volume comes from active filling.
The P wave of an ECG indicates Select one: a. atrial depolarization. b. atrial repolarization. c. ventricular depolarization. d. ventricular repolarization. e. threshold.
a. atrial depolarization
Which of the following phrases would apply to cardiac muscle cells?
Select one:
a. are organized in parallel columns or bundles
b. contain actin but no myosin
c. develop a significant oxygen debt during systole
d. are multinucleated like skeletal muscle cells.
e. possess special cell-to-cell contacts called intercalated discs
e. possess special cell-to-cell contacts called intercalated discs
The cardioregulatory center of the brain is located in the Select one: a. hypothalamus. b. medulla oblongata. c. cerebellum. d. cerebrum. e. diencephalons.
b. medulla oblongata.
An incompetent pulmonary semilunar valve could result in less blood reaching the Select one: a. lungs. b. heart muscle. c. right ventricle. d. aorta. e. right atrium.
a. lungs.
Which of the following will depolarize immediately after the AV node depolarizes?
Select one:
a. the AV bundle
b. Purkinje fibers
c. atrial myocardium
d. bundle branches in the ventricular septum
e. the SA node
a. the AV bundle
Coronary artery disease can diminish myocardial blood flow resulting in the death of myocardial cells. This condition is known as a myocardial Select one: a. attack. b. angina. c. necrosis. d. cirrhosis. e. infarction.
e. infarction.
The AV valve that is located on the same side of the heart as the origin of the aorta is the
Select one:
a. bicuspid or mitral valve.
b. tricuspid valve.
c. aortic semilunar valve.
d. pulmonary semilunar valve.
e. coronary sinus valve.
a. bicuspid or mitral valve.
If the SA node is nonfunctional, which of the following is most likely to occur?
Select one:
a. The heart will go into asystole (stop).
b. Tachycardia will develop.
c. Another portion of the heart will become the pacemaker.
d. The heart will go into defibrillation.
e. The heart will be desensitized.
c. Another portion of the heart will become the pacemaker.
These vessels transport blood to the right and left lungs. Select one: a. aorta b. right atrium c. pulmonary trunk d. pulmonary arteries e. pulmonary veins
d. pulmonary arteries
Angina pectoris is chest pain caused by reduced Select one: a. stimulation of the myocardium. b. blood supply to cardiac muscle. c. fluid in the pericardial sac. d. contractility of the heart. e. action potentials from SA node.
b. blood supply to cardiac muscle.
This blood vessel carries blood from the left ventricle. Select one: a. aorta b. right atrium c. pulmonary trunk d. pulmonary arteries e. pulmonary veins
a. aorta