Exam I: Chapter 19 Part I HW

Which artery curves to the left around the coronary sulcus, eventually meeting and fusing with small branches of the right coronary artery?

circumflex artery

What occurs when the left ventricle contracts? A) The distance between the base and apex decreases. B) The volume of the right ventricle is increased. C) Blood is moved very efficiently with minimal effort, but it develops relatively low pressures. D) The diameter of the ventricular chamber increases.

A) The distance between the base and apex decreases.

The middle cardiac vein: A) drains the area supplied by the posterior interventricular artery and empties into the coronary sinus. B) drains blood from the region supplied by the anterior interventricular artery. C) drains the area supplied by the circumflex artery. D) drains the anterior surface of the right ventricle and empties directly into the right atrium.

A) drains the area supplied by the posterior interventricular artery and empties into the coronary sinus.

Cardiac muscle cells are: A) mechanically, chemically, and electrically connected to one another. B) nonstriated in appearance. C) almost totally dependent on anaerobic metabolism. D) multinucleated, with a low demand for nutrients.

A) mechanically, chemically, and electrically connected to one another.

Which structure provides a rapid-conduction path that tenses the papillary muscles before the ventricular myocardium contracts, preventing "slamming" of the right AV cusps? A) moderator band B) chordae tendineae C) trabeculae carneae D) pectinate muscles

A) moderator band

Which is true regarding coronary function? A) The AV valves open before the semilunar valves close. B) The semilunar valves close before the AV valves open. C) When the ventricles are relaxed, the AV valves resist the flow of blood from the atria into the ventricles. D) When the ventricles contract, the cusps of the AV valves are open.

B) The semilunar valves close before the AV valves open.

Balloon angioplasty: A) is a procedure that must be performed on an inpatient basis. B) is most effective in treating small, soft plaques. C) has a very low success rate. D) has a high mortality rate during surgery.

B) is most effective in treating small, soft plaques.

The heart is actually (one, two, or three) pumps?

Two pumps -the right side of the heart pumps to/from the lungs (pulmonary circuit) and the left side of the heart pumps to/from the rest of the body (the systemic circuit).

Which heart chamber receives blood from the pulmonary veins?

left atrium -the left atrium receives oxygenated blood from the pulmonary veins.

Which chamber pumps oxygenated blood out the aorta to the systemic circuit?

left ventricle -the left ventricle pumps oxygenated blood out the aorta to the entire body (systemic circuit).

Which structure attaches the pulmonary trunk to the aortic arch?

ligamentum arteriosum

Which layer of the heart wall contains cardiac muscle tissue, blood vessels, and nerves?

myocardium

Which chamber receives blood from the superior and inferior vena cavae?

right atrium -the right atrium receives unoxygenated blood from the systemic circuit.

Which heart chamber pumps unoxygenated blood out the pulmonary trunk?

right ventricle -the right ventricle pumps unoxygenated blood out the pulmonary trunk to the lungs.