Chpt 15 Quiz 2 AP

Valves help to ensure one-way blood flow in the__________.

• heart and veins
• arteries and veins 

• capillaries

• heart and veins

What blood vessels hold the greatest volume of blood?

• Arteries

• Arterioles

• Capillaries

• Veins

A patient is brought to the emergency room with a severe anxiety attack. The doctor administers a dose of potassium to control their elevated heart rate. Why would potassium be a potential treatment for the cardiovascular effects of an anxiety attack?

• Elevated potassium ion concentration reduces parasympathetic nervous system ouput which, in turn, decreases heart rate.

• Elevated potassium ion concentration reduces sympathetic nervous system ouput which, in turn, increases heart rate.

• Elevated potassium ion concentration causes decreased heart rate and increased force of contraction.

• Elevated potassium ion concentration causes decreased heart rate and decreased force of contraction.

Blood vessels called__________ carry blood toward the heart, and__________ carry blood away from the heart.

• veins; arteries
• arteries; veins 

• capillaries; arteries 

• veins; capillaries

Anastomoses between smaller arteries are found in the coronary circulation.

• True
• False

What is the correct sequence of components of the cardiac conduction system?

• SA node → AV node → AV bundle → Purkinje fibers

• SA node → Purkinje fibers → AV node → AV bundle

• AV node → SA node → Purkinje fibers→ AV bundle

• AV node → AV bundle → Purkinje fibers → SA node

Which valve is located between the left atrium and left ventricle?

• Mitral valve

• Pulmonary valve

• Aortic valve

• Tricuspid valve

The single layer of epithelial cells that form the capillary walls minimizes the barrier for exchange of substances between blood and tissue fluids.

• True
• False

Why do many patients with kidney disease also have hypertension?

• Cells of diseased kidneys directly signal the brain stem to increase blood pressure.

• Diseased kidneys excrete more sodium and water than is needed.

• Changes in blood flow in kidneys leads to release of renin.

• Altered kidney function results in secretion of atrial natriuretic peptide by the heart.

What is the function of the papillary muscles of the heart?

• To assist in the ejection of blood

• To help conduct cardiac impulses throughout the ventricular myocardium

• To hold the semilunar valves closed during ventricular diastole

• To prevent atrioventricular valves from prolapsing