Week 4: Muscle Structure and Function

Question 1

muscle producing movement

Answer 1

agonist

Question 2

muscle for ankle dorsiflexion

Answer 2

tibialis anterior

Question 3

muscle for plantarflexion

Answer 3

gastrocnemius

Question 4

muscle for knee extension

Answer 4

quadriceps

Question 5

muscle for knee flexion

Answer 5

hamstrings

Question 6

ability of the muscle to go back to its original resting length

Answer 6

elasticity

Question 7

component of the reflex arc that interprets the signals

Answer 7

CNS

Question 8

functional unit of the muscle

Answer 8

sarcomere

Question 9

which one can produce greater tension or force?

quadriceps or biceps brachii

Answer 9

quadriceps = has greater diameter

Question 10

which one can produce greater tension or force?

eccentric concentric isometric

Answer 10

eccentric

Question 11

thin filaments of the muscle are composed by:

a. actin
b. troponin
c. tropomysin
d. all of the above

Answer 11

d.

Question 12

binding of myosin heads to active sites of actin

Answer 12

cross bridge formation

Question 13

storage of calcium in the muscle

Answer 13

sarcoplasmic reticulum

Question 14

which one can produce greater tension or force?

gluteus maximus or sartorius

Answer 14

gluteus maximus

Question 15

which one can produce greater tension or force?

muscle at full elbow flexion or muscle at 90 deg of elbow flexion

Answer 15

muscle at 90 deg of elbow flexion

Question 16

which one can produce greater tension or force?

type 1 muscle fibers or type 2 muscle fibers

Answer 16

type 2 muscle fibers = responsible for movement such as quadriceps, hamstrings

Question 17

receptors in the muscle that are sensitive to stretch

Answer 17

muscle spindle

Question 18

receptors in the muscle that are sensitive to tension

Answer 18

golgi tendon organ

Question 19

muscle do not change in length

Answer 19

isometric contraction

Question 20

muscle changes in length

Answer 20

isotonic contraction

Question 21

more speed, less tension

Answer 21

concentric contraction

Question 22

more speed, more tension

Answer 22

eccentric contraction

Question 23

force output from greatest to least

Answer 23

eccentric, isometric, concentric contraction

Question 24

high resistance to fatigue

Answer 24

type 1 fibers

Question 25

used in anaerobic

Answer 25

type 2 fibers

Question 26

slow contraction time

Answer 26

type 1 fibers

Question 27

stretch reflex which activates agonist

Answer 27

reciprocal inhibition

Question 28

enough tension triggers GTOs which tell muscles to stop to relax the muscle

Answer 28

autogenic inhibition

Question 29

ability of a muscle to shorten with force

Answer 29

contractility