Chapter 9: Twitches and Contractions

Question 1

Twitch

Answer 1

the smallest contraction that can be measured in a labratory

Question 2

What are the three phases of the twitch?

Answer 2

Lag/latent
Contraction
Relazation

Question 3

What are the two types of muscle contractions?

Answer 3

isometric

isotonic

Question 4

isometric contraction

Answer 4

no change in length but tension increases

Question 5

isotonic

Answer 5

muscle length changes as well as tension

Question 6

concentric isotonic movement

Answer 6

overcomes oposing resistance and muscle shortens

Question 7

treppe

Answer 7

a graded response where each contraction builds on the last (to a point) because more Ca+ remains in the sarcoplasm

Question 8

eccentric isotonic movement

Answer 8

tension remains but muscle lengthens

Question 9

wave summation

Answer 9

muscle tension increases as contraction frequencies increase

Question 10

incomplete tetanus

Answer 10

muscle fibers partially relax between contractions

Question 11

complete tetanus

Answer 11

no relaxation between contractions (cramping)

Question 12

multiple motor-unit recruitment

Answer 12

The idea that the more muscle fibers are needed for stronger movements.

Question 13

size principle

Question 14

muscle tone

Question 15

creatine kinase

Answer 15

the enzyme that transfers a phosphate to ADP to create ATP if it drops in the contracting muscle fiber.

Question 16

anaerobic respiration

Answer 16

requires the breakdown of glucose to produce ATP for muscle contraction.