A&P II - Chapter 18 - The Heart

What is the function of the coronary circulation?

• Provide a blood supply to the lungs

• Provide a blood supply to the heart

• Provide a blood supply to the pericardium

• Provide a blood supply to the aortic arch

What is the ligamentum arteriosum?

• A ligament attaching the aorta to the superior vena cava

• A ligament securing the aorta

• A remnant of the foramen ovale

• A remnant of the ductus arteriosus

Answer explanation

The ligamentum arteriosum is a remnant of the ductus arteriosus. The ductus arteriosus is a fetal shunt that connects the pulmonary trunk to the aorta.

Which chamber of the heart exits into the pulmonary trunk?

• Right Atrium

• Right Ventricle

• Left Atrium

• Left Ventricle

Identify the ear like flaps that are attached to the top chambers of the heart.

• Atrium

• Coronary Sinus

• Pectinate Muscles

• Auricle

The first branch off the arch of the aorta is the brachiocephalic

artery in both the sheep and the human.

• True

• False

The base of the heart is located at the bottom of the heart.

• True

• False

Answer explanation

The base is located at the top of the heart. It is unusual to see the largest portion of an organ at the top. Typically, the base is at the bottom of an organ, as in the lungs.

The most muscular chamber of the heart is the right ventricle.

• True

• False

Answer explanation

The left ventricle is responsible for pumping blood out to the body. This requires a lot of force. The left ventricle is the most muscular in order to pump the blood with adequate force.

Choose which of the following correctly orders the lining of the heart

in order from innermost to outermost.

• Endocardium, Myocardium, Epicardium

• Pericardium, Endocardium, Epicardium

• Endocardium, Epicardium, Myocardium

Identify the valve found between the left atrium and left ventricle.

• Tricuspid valve

• Pulmonary valve

• Bicuspid (mitral) valve

• Aortic valve

What heart chamber pushes blood through the aortic semilunar valve?

• Right atrium

• Left atrium

• Right ventricle

• Left ventricle