Anatomy and Physiology chapter 11
During ventricular systole, blood is ejected from the ventricles through the large arteries connected to the heart. a) True b) False
a) True
Sustained elevated arterial blood pressure above 140/90 mm Hg is a condition known as ________. a) hypertension (high blood pressure) b) orthostatic hypotension c) myocardial infarction d) circulatory shock
a) hypertension (high blood pressure)
All four heart valves are briefly closed as pressure begins to rise in the ventricles, a phase known as ________. a) isovolumetric contraction b) ventricular systole c) atrial diastole d) atrial systole e) isovolumetric relaxation
a) isovolumetric contraction
The heart is situated within the medial section of the thoracic cavity known as the ________. a) mediastinum b) hilus c) diaphragm d) hiatus e) pleural cavity
a) mediastinum
The sinoatrial (SA) node is located in the ________. a) right atrium b) interventricular septum c) aorta d) left atrium e) right ventricle
a) right atrium
Stroke volume is the amount of blood pumped out by each ventricle of the heart in one minute. a) True b) False
b) False
The QRS wave on an electrocardiogram (ECG) is representative of ventricular repolarization. a) True b) False
b) False
Which of the following will promote vasodilation? a) Exercise b) Heat c) Angiotensin II d) Epinephrine
b) Heat
What is the flow of blood through a capillary bed called? a) systemic circulation b) microcirculation c) pulmonary circulation d) hepatic portal circulation
b) microcirculation
Which term means heart contraction? a) diastole b) systole c) fibrillation d) tachycardia
b) systole
Which of the following enforces a contraction rate of 75 beats per minute as the pacemaker of the intrinsic conduction system of the heart? a) Purkinje fibers b) Sinoatrial (SA) node c) Atrioventricular (AV) node d) Atrioventricular (AV) bundle (bundle of His)
b)l Sinoatrial (SA) node
The first heart sound, "lub," is caused by the closure of the ________ valves. a) pulmonary b) aortic c) semilunar d) atrioventricular (AV)
d) atrioventricular (AV)
Which type of vessel is constructed only from tunica intima? a) venules b) veins c) arteries d) capillaries e) arterioles
d) capillaries
Which of the following increases heart rate? a) cold b) low levels of calcium c) parasympathetic nervous system stimulation d) epinephrine e) vagus nerve stimulation
d) epinephrine
Cardiac output is the product of which two variables? a) diastole and systole b) contraction and relaxation c) heart rate and blood pressure d) heart rate and stroke volume e) blood pressure and peripheral resistance
d) heart rate and stroke volume
Pulmonary circulation involves blood flow to and from the heart and the ________. a) body b) digestive organs c) skin d) lungs e) brain
d) lungs
Veins ________. a) operate under high-pressure b) carry blood away from the heart c) transport oxygen-rich blood d) often have valves to prevent the backflow of blood e) branch into smaller vessels called arterioles
d) often have valves to prevent the backflow of blood
A phlebotomist places a needle into a vessel to draw blood; this vessel is characterized by thin walls, low pressure, and is a ________. a) terminal arteriole b) pulmonary artery c) systemic artery d) vein
d) vein
Which wave on the electrocardiogram (ECG) results from the firing of the sinoatrial (SA) node? a) T b) QRS c) P d) S-T
c) P
Which vessel drains capillary beds? a) Terminal arterioles b) Systemic arteries c) Postcapillary venule d) Precapillary sphincters
c) Postcapillary venule
