Cardiovascular and Respiratory Systems

What is the thickest layer of the heart wall?

• Myocardium
• Epicardium
• Endocardium
• Pericardium

Which of the following is NOT a chamber of the heart?

• Superior ventricle
• Right atrium
• Left atrium
• Right ventricle

Deoxygenated blood from the body enters what chamber of the heart?

• Right atrium
• Left atrium
• Left ventricle
• Right ventricle

What vessels send oxygenated blood from the lungs back to the heart?

• Pulmonary veins
• Pulmonary arteries
• Aorta
• Superior vena cava

What muscle makes up the atrial walls of the heart?

• Pectinate muscle
• Trabeculae carneae muscle
• Skeletal muscle
• Smooth muscle

Internally, the left and right ventricles of the heart are divided by the __________

• Interventricular septum
• Atrioventricular sulcus
• Anterior interventricular sulcus
• Atrioventricular septum

What is the flap-like structure covering the external surface of the right and left atriums of the heart?

• Auricle
• Sulcus
• Septum
• Endocardium

The tricuspid valve of the heart is also known as the ___________

• Right atrioventricular valve
• Left atrioventricular valve
• Aortic valve
• Pulmonary valve

The apex of the heart is superior to the base

• False
• True

Compared to veins, arteries...

• Have a thick tunica media
• Have a large lumen
• Have less collagen and elastic fibres
• Are more numerous