Lecture 18 & 19 Quiz

What are the cell-to-cell contacts of the cardiac muscle fibers called? a) Intercalated discs b) Sarcoplasmic reticulum c) T-tubules d) Z discs

a) Intercalated discs

Which carries oxygenated blood from the lungs to the heart? a) Pulmonary veins b) Inferior vena cava c) Superior vena cava d) Pulmonary trunk e) Pulmonary arteries

a) Pulmonary veins

Branches of the subclavian arteries carry blood on the way to the brain, neck and shoulder muscles, and mammary glands. a) True b) False

a) True

The term "epicardium" is another name for the ____. a) visceral layer of the serosal pericardium. b) myocardium. c) mediastinum. d) parietal layer of the serosal pericardium. e) external layer of the fibrous pericardium.

a) visceral layer of the serosal pericardium.

The internal wall surface of each ventricle displays large, smooth, irregular muscular ridges called _____. a) pectinate muscles. b) trabeculae carneae. c) conus arteriosus. d) tendinous cords. e) atrioventricular opening.

b) trabeculae carneae.

In arteries, the thickest layer of the wall is the ____. a) tunica externa. b) tunica media. c) tunica intima. d) tunica adventitia. e) None of the answers are correct because all the layers are of the same dimension.

b) tunica media.

Which can be used to characterize blood flow in the human body? a: There is a unidirectional blood flow. b: Arteries always carry oxygenated blood. c: Veins always carry deoxygenated blood. d: Arteries carry blood away from the heart. e: Veins carry blood toward the heart. a) d, e b) a, b, c, d, e c) a, d, e d) a, c, d, e e) b, c, d, e

c) a, d, e

Which action leads to the closure of the right atrioventricular valve? a) Contraction of the left atrium b) Relaxation of the right ventricle c) Contraction of the right atrium d) Contraction of the right ventricle e) Relaxation of the left atrium

d) Contraction of the right ventricle

Which of the cardiovascular system's circuits has deoxygenated blood in its arteries? a) Visceral circuit b) Coronary circuit c) Systemic circuit d) Pulmonary circuit

d) Pulmonary circuit

Gas, nutrient, and waste exchange occur between the ________ and the tissues of the body. a) capillaries and arteries b) veins c) arteries d) capillaries e) capillaries and veins

d) capillaries

The atria are separated from the ventricles externally by the ______. a) anterior interventricular sulcus. b) posterior interventricular sulcus. c) sinoventricular sulcus. d) coronary sulcus. e) None of the choices is correct.

d) coronary sulcus

The lateral border of the right ventricle of the heart is supplied by the: a) posterior interventricular artery. b) circumflex artery. c) anterior interventricular artery. d) great cardiac vein. e) right marginal artery.

e) right marginal artery.