Term
To which of the following structures do the cross-bridges attach during muscle action?
A. Actin
B. Myosin
C. M-bridge
D. sarcolemma |
|
Definition
|
|
Term
Which of the following substances regulates muscle actions?
A. Potassium
B. Calcium
C. Troponin
D. Tropomyosin |
|
Definition
|
|
Term
Which of the following substances acts at the neuromuscular junction to excite the muscle fibers of a motor unit?
A. Acetylcholine
B. ATP
C. Ceatine Phosphate
D. Serotonin |
|
Definition
|
|
Term
Which of the following muscle fiber types is the MOST beneficial for a marathon runner?
A. Type I
B. Type IIa
C. Type IIx
D. Type IIc |
|
Definition
|
|
Term
When throwing a baseball, an athletes arm is rapidly stretched just prior to throwing the ball. Which of the following structures detects and responds to that stretch by reflexively increasing muscle activity?
A. Golgi Tendon Organ
B. Muscle Spindle
C. Extrafusal Muscle
D. Pacinian Copuscle |
|
Definition
|
|
Term
From which of the following is the heart's electrical impulse normally initiated?
A. AV Node
B. SA Node
C. The Brain
D. The Sympathetic Nervous System |
|
Definition
|
|
Term
Which of the following occurs during the QRS complex of a typical ECG?
I. Depolarization of the Atrium
II. Repolarization of the Atrium
III. Repolarization of the Ventricle
IV. Depolarization of the Ventricle
A. I and III Only
B. II and IV Only
C. I, II, III Only
D. II, III, IV Only |
|
Definition
|
|
