Cardiovascular System test

Which of the following is the outermost covering of the heart?

• visceral layer

• epicardium

• parietal layer

• fibrous pericardium

Into what vessel does the left ventricle eject blood?

• superior vena cava

• pulmonary veins

• aorta

• pulmonary trunk

Which of the following is NOT a difference between cardiac and skeletal muscle?

• The plasma membranes of cardiac muscle cells interlock, but skeletal muscle fibers are independent.

• Cardiac muscle does not use the sliding filament mechanism for contraction; skeletal muscle does.

• Cardiac muscle cells contain more mitochondria than do skeletal muscle cells.

• Cardiac muscle cells quickly die in the absence of oxygen; skeletal muscle cells are better able to adapt to oxygen deficiency.

Into which chamber do the pulmonary veins send blood?

• left atrium

• right ventricle

• right atrium

• left ventricle

Which heart chamber sends deoxygenated blood to the lungs?

• right atrium

• left ventricle

• right ventricle

• left atrium

Which of the following is NOT a vein that returns blood to the right atrium of the heart?

• coronary sinus

• inferior vena cava

• pulmonary vein

• superior vena cava

The presence of an incompetent tricuspid valve would have the direct effect of causing ______.

• reduced efficiency in the delivery of blood to the lungs

• reduced efficiency in the delivery of blood to the myocardium

• reduced efficiency in the delivery of blood from the lungs to the heart

• reduced efficiency in the delivery of blood from the head to the heart

What separates the parietal and visceral pericardium?

• myocardium

• fibrous pericardium

• epicardium

• pericardial cavity

What is the main function of heart valves?

• to separate the left and right atria

• to pump blood through the heart

• to separate the atria and ventricles

• to prevent backward flow of blood

When the atria contract, which of the following is true?

• The ventricles are in diastole

• The atria are in diastole.

• The AV valves are closed.

• The semilunar valves are open.