Chapter 34 Quiz 2

The (a)_______________ acts as the pacemaker of the heart. It initiates the heartbeat by generating electrical impulses. The electrical impulses pass to the (b)_______________ which relays the impulses to the ventricles along the septum.

• (a) AV node；(b) SA node

• (a) SA node；(b) AV node

During the stage of (c)_______________, the closure of (d)_______________ produce the first heart sound.

• (c) atrial systole；(d) semilunar valves

• (c) atrial systole；(d) tricuspid and bicuspid valves

• (c) ventricular systole；(d) semilunar valves

• (c) ventricular systole；(d) tricuspid and bicuspid valves

When more nerve impulses are sent through the_______________ to the SA node, the cardiac output is decreased.

• sympathetic nerve

• vagus nerve

During exercise, the adrenal glands are stimulated by the (e)_______________ to secrete (f)_______________ adrenaline into the blood.

• (e) sympathetic nerve；(f) more

• (e) sympathetic nerve；(f) less

• (e) vagus nerve；(f) more

• (e) vagus nerve；(f) less

During exercise, more nerve impulses are sent through the vagus nerve to the respiratory muscles.

• True

• False

During vigorous exercise, skeletal muscle cells carry out both aerobic respiration and anaerobic respiration.

• True

• False

After exercise, our ventilation rate returns to normal immediately.

• True

• False

After exercise, extra oxygen is needed to metabolize the lactic acids accumulated in the skeletal muscle cells.

• True

• False