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The thick layer of the heart wall that contains contractile cardiac muscle tissue is the:
The atria of the heart are the chambers that are:
located superiorly and are the receiving chambers of the heart
Which one of the following blood vessels is NOT part of the systemic circulation:
When the ventricles contract, the bicuspid valve prevents blood from flowing from the:
left ventricle to the left atrium
Which one of the following are direct branches of the left coronary artery:
anterior interventricular and circumflex arteries
The crescent-shaped pacemaker of the heart that initiates depolarization under normal conditions is the:
Which one of the following represents the correct path for the transmission of an impulse in the intrinsic conduction system of the heart:
SA node, AV node, AV bundle, right & left bundle branches, Purkinje fibers
Which one of the following is true concerning the lub-dub sounds of the heart:
the first sound is longer and louder and is caused by closure of the AV valves; the second sound is shorter and sharper and is caused by closure of the semilunar valves
The volume of blood pumped out by each ventricle with each beat of the heart is called the:
The path of blood flow within the systemic vascular system is:
arteries, arterioles, capillary beds, venules, veins
A person with a heart rate of 75 beats per minute and a stroke volume of 60 mL per beat has a cardiac output of:
An increase in parasympathetic activity (primarily by the vagus nerves) causes:
a decrease in both heart rate and cardiac output
Which one of the following is caused by a decrease in venous return to the heart:
a decrease in stroke volume and cardiac output
Which one is the correct sequence going from the outermost to the innermost layer of a blood vessel wall:
tunica externa, tunica media, tunica intima
Which of the following blood vessels is a direct branch of the ascending aorta:
both the right and left coronary arteries
Which one of the following does NOT receive blood directly from the aortic arch:
right common carotid artery
Which of these pathways correctly traces blood as it travels from the aortic arch to the left arm:
aortic arch, left subclavian artery, left axillary artery, left brachial artery
Blood travels to the stomach by way of the branch of the celiac trunk called the:
left gastric artery
The brachial vein:
drains blood from the radial and ulnar veins, then empties that blood into the axillary vein
Which one of the following blood vessels in the fetus has the highest concentration of oxygen:
Generalized vasoconstriction occurs as a result of:
an increase in sympathetic nervous system firing
Which one of the following is the main function of renin and aldosterone:
they are produced whenever blood pressure falls and ultimately cause an increase in blood volume and blood pressure
Which one of the following are the main functions of renin and angiotensin II:
blood pressure falls-this causes vasoconstriction and an increase in blood pressure
Substances tend to leave the bloodstream at the arterial end of the capillary because:
blood pressure is higher at the arterial end of the capillary
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