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1

what is the function of a muscle

generate force, allows for movement

2

what is the function of a motor neuron

signal muscle to contract allows for voluntary control

3

why are muscles and motor neurons important for exercise

exercise requires coordinated movements involving multiple muscle groups and varied amounts of force

4

what are the parts of a muscle

muscle- fasicle- fiber- myofibril- sarcomere- thick/thin

5

what are the structures in a muscle fiber

sarcolemma transverse tubules sarcoplasmic reticulum mitochondria nucleus

6

what is a muscle fiber that is enclosed by a plasma membrane called

sarcolemma

7

what in the muscle stores calcium

sarcoplasma reticulum

8

what is the purpose of calcium in the muscle

moves troponin off, allowing tropomyosin to dissociate and expose the actin for binding

9

what is a thin filament

actin

10

what is a thick filament

myosin

11

facts of sarcomere

smallest functional unit of a muscle composed of thick and thin filament

12

2/3 of all muscle protein is made of

myosin

13

what are thin filament proteins

actin troponin tropomyosin

14

what are the thick filament proteins

myosin

15

what is the function of an alpha motorneuron

conduct impulse signals from CNS to muscle and initiate a contraction

16

where are motorneurons grouped together

spinal cord

17

motor neurons innervates what fibers

alpha motorneurons

18

what composes a motor unit

neuron and muscle it innervates

19

smaller motor unit size is used for

dexterity

20

larger motor unit size is used for

force

21

what is the neuromuscular junction

area where nerve "connects" to muscle fiber

22

what signals are used in the neuromuscular junction

acetylcholine

23

what maximizes contact for ACh release and capture in neuromuscular junction

shape and structure

24

what are the four muscle fiber types

Type 1 : slow twitch Type 2a Type 2b Type 2x

25

what happens for muscles with increased length

increased contraction velocity

26

what happens for muscles with increased CSA

increased force

27

if you increase CSA you increase what

force

28

what proteins are in abundance in strong and big muscles

contractile

29

what is muscle architecture

arrangement of muscle fibers relative to the axis of force generation

30

what is an agonist

prime movers, responsible for the movement