Function of skeletal muscle organs

Question 1

twitch contraction

Answer 1

A quick jerk of a muscle produced as a result of a single, brief threshold stimulus (generally occurs only in experimental situations)

Question 2

Latent phase

Answer 2

nerve impulse travels to the SR to trigger release of Ca++
ATP->ACh-> impulse

Question 3

Contraction phase

Answer 3

Ca++ binds to troponin and sliding of filaments occurs

Question 3

Relaxation phase

Answer 3

sliding of filaments ceases

Question 4

Treppe: the staircase phenomenon

Answer 4

Gradual, steplike increase in the strength of contraction that is seen in a series of twitch contractions that occur 1 second apart

Question 5

If the relaxation phase disappears completely

Answer 5

a contracture occurs

Question 6

The muscle eventually responds with less-forceful contractions, and the relaxation phase

Answer 6

becomes shorter

Question 7

Multiple wave summation

Answer 7

multiple twitch waves added together to sustain muscle tension for a longer time

Question 8

Incomplete tetanus

Answer 8

very short periods of relaxation between peaks of tension

Question 9

Tetanus

Answer 9

smooth, sustained contractions(normal)

Question 10

Complete tetanus(normal)

Answer 10

twitch waves fuse into a single, sustained peak

Question 11

The availability of Ca++ determines whether a muscle will contract; if Ca++ is continuously available

Answer 11

then contraction will be sustained