Chpt 15 Quiz 3 AP

When taking a pulse at the wrist, which artery is being palpated?

• Radial artery

• Brachial artery

• Palmar arch

• Ulnar artery

Blood entering the right atrium comes from what structure(s)?

• Venae cavae and coronary sinus

• Pulmonary trunk

• Right ventricle

• Pulmonary veins

What causes the T wave on an ECG?

• Repolarization of ventricular myocardium

• Depolarization of atrial myocardium

• Repolarization of atrial myocardium

• Depolarization of ventricular myocardium

Why is the cardiovascular system vital to survival?

• It ensures that the lungs fully inflate.

• It delivers waste molecules to vital organs.

• It supplies oxygen and nutrients to cells.

• It delivers carbon dioxide to tissues and removes excess oxygen.

Doctors suggest that during long periods of sitting, you should flex and extend your feet at the ankles periodically and squeeze your calf muscles to assist with blood circulation. Why would non-exercise muscle contraction affect blood flow and cardiovascular health?

• Non-exercise contraction of the leg muscles squeezes leg veins, which forces deoxygenated blood back to the heart.

• Non-exercise contraction of the leg muscles stimulates baroreceptors which signal the autonomic nervous system to decrease blood pressure and heart rate.

• Non-exercise contraction of the leg muscles increases heart rate and burns calories, keeping the heart strong and assisting in maintaining healthy weight.

• Non-exercise contraction of the leg muscles stimulates the arteries to vasodilate, reducing blood pressure.

What chambers of the heart will contain oxygen-poor blood?

• Right atrium and left atrium

• Right atrium and right ventricle

• Left atrium and left ventricle

• Left atrium and right ventricle

In capillary beds, the net inward pressure at the venular ends of the capillaries is less than the net outward pressure at the arteriolar ends of the capillaries. What is the result of this difference in pressures?

• More fluid leaves the capillaries than returns.

• More fluid flows into the capillaries than moves out.

• Lymphatic vessels push fluid into the capillaries.

• Pressure in the venules increases.