Muscle Contraction

Question 1

Muscle contractions convert ________ energy to _______ energy

Answer 1

chemical to mechanical

Question 2

Motor unit

Answer 2

of muscle fibers innervated by 1 motor neuron

Question 3

Motor end plate

Answer 3

impulse from nerve ending to muscle fiber membrane

Question 4

Excitation-contraction coupling steps

Answer 4

1. Ca rush into presynaptic terminal
2. Vesicles release Ach
3. Ach bind NA gate
4. Na rush into sarcolemma
5. Electrical depolarization in muscle fiber

Question 5

Acetylcholinesterase

Answer 5

enzyme that breaks down acetylcholine into acetic acid + choline

Question 6

In a resting cell membrane, ____ is higher intracellular and ____ is higher extracellular

Answer 6

K = intracellular
Na = extracellular

Question 7

____________ transmit stimuli to interior of fiber

Answer 7

T-tubules

Question 8

Sliding filament theory

Answer 8

1. Cross bridge formation
2. Power stroke (ADP released)
3. Cross-bridge detachment (ATP binds)
4. Reactivation of myosin (ATP to ADP)

Question 9

Ca pump

Answer 9

a pump that uses ATP to import Ca into sarcoplasmic reticulum