Chapter 13

Question 1

Individual muscle fibers arranged in bundles

Answer 1

Fascicles

Question 2

Attach muscle to bone

Answer 2

Tendons

Question 3

Less movable point of attachment

Answer 3

Origin

Question 4

More movable point of attachment

Answer 4

Insertion

Question 5

Does not work

Answer 5

Prime mover

Question 6

Aid Prime mover

Answer 6

Synergists

Question 7

Act in opposition to Prime mover

Answer 7

Antagonist

Question 8

Plasma membrane are called

Answer 8

Sarcolemma

Question 9

Extensions of sarcolemma that extend into cytoplasm

Answer 9

Transverse tubules

Question 10

Contractile portions of muscle fibers

Answer 10

Myofibrils

Question 11

Myofibrils made up of ____

Answer 11

Myofilaments

Question 12

Myosin

Answer 12

Thick

Question 13

Actin

Answer 13

Thin

Question 14

Regions of myofibrils that shorten during contraction

Answer 14

Sacromeres

Question 15

Carry electrical impulses from nervous system

Answer 15

Motor neurons

Question 16

Neurotransmitter that activates muscle cells

Answer 16

Acetylcholine (ach)

Question 17

Carry electrical impulses from nervous system

Answer 17

Motor neurons

Question 18

Motor neuron and all of the muscle fibers it stimulates

Answer 18

Motor unit

Question 19

All fibers within a motor unit contract or do not contract

Answer 19

All or none law

Question 20

Force generated by muscle contraction

Answer 20

Muscle tension