Chapter 1 Study Questions

Question 0

Which of the following substances regulates muscle actions?

Answer 0

Calcium

Question 1

To which of the following structures do the cross bridges attach during muscle action?

Answer 1

Actin

Question 2

Which of the following substances acts at the neuromuscular junction to excite the muscle fibers of a motor unit?

Answer 2

Acetylcholine

Question 3

Which of the following muscle fiber types is the MOST beneficial for a marathon runner?

Answer 3

Type 1

Question 4

When throwing a baseball, an athlete’s arm is rapidly stretched just prior to throwing the ball. Which of the following structures detects and responds to that stretch by reflectively increasing muscle activity?

Answer 4

Muscle spindle

Question 5

From which of the following is the heart’s electrical impulse normally initiated?

Answer 5

SA node

Question 6

Which of the following occurs during the QRS complex of a typical ECG?

Answer 6

Repolarization of the atrium

Depolarization of the ventricle