3. Which stimulus pattern can evoke tetanus?
A. (A) pair of action potentials
B. (B) single action potential
C. (C) series of action potentials at high frequency
D. (D) series of action potentials at low frequency
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2. Which is correct about the innervation number?
A. (A) the number of muscle fibers innervated by multiple motor neurons
B. (B) the number of muscle fibers innervated by one motor neuron
C. (C) the innervation number is constant among different muscle types
D. (D) all of above
1. Which is correct about motor unit properties mediated by physical activity?
A. (A) strength training increases contraction speed and force
B. (B) strength training decreases contraction speed and force
C. (C) endurance training increases motor unit fatigability
D. (D) endurance training decreases contraction speed and force
3. Which is correct about the cross bridge cycle?
A. (A) no energy consumption in the cycle
B. (B) ADP binding is essential for release of calcium ions
C. (C) ATP binding is essential for actin detachment
D. (D) calcium ions bind to thick filament
2. Which ion is released from the sarcoplasmic reticulum during muscle contraction?
A. (A) sodium ion
B. (B) potassium ion
C. (C) calcium ion
D. (D) chloride ion
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