4 functions of muscular system

31 terms by erickgreen35 

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movement

muscles contract, cause movement at joints

posture

hold you upright

joint stability

hold bones/joints inplace and allows movement

heat production

muscles contract and cause blood to flow to the area heat

4 functions of muscular system

movement,posture, joint stability and heat production

4 characteristics as they relate to function

excitability,extensibility,contractility and elasticity

excitability

muscle ability to react to stimuli

extensibility

muscle ability to lengthen/or be stretched

contracility

muscle ability to shorten/contract

elasticity

muscles ability to recoil/return to original length

parts of skeletal muscle

epimysium,perimysium,endomysium,tendon and aponeurosis

epimysium

connective tissue sheath that surrounds the entire muscle

perimysium

connective tissue sheath that surrounds a bundle of muscle fibers

endomsium

connective tissue sheath that surrounds the individual muscle fibers

tendon

cord like bunch of dense fibrous connective tissue that connects muscle to bone {avascular}

aponeurosis

a broad flat sheet like connective tissue that connects muscle to bone or another muscle

skeletal muscle fiber

sarcolemma,sarcoplasm and sarcoplasmic reticulum

sarcolemma

cell membrane

sarcoplasm

cytoplasm fluid inside of cell

sarcoplasmic reticulum

stores calcium

ratchet theory

is the sliding filament theory {how a muscle contracts}

1

nerve impulse is sent

2

calcium ions are dumped and flood sarcomere

3

active sites of actin are exposed

4

actin grabs ahold of myosin and forms a cross bridge

5

bend and pull untill they "break off"

6

grab another active site of actin

7

process continues as long as calcium ions are present

ligament

similar to tendon,avascular, dense fibrous connective tissue connects bone to bone

origin

end of a muscle that is attached to a relatively immoveable part

insertion

end of a muscle that is attached to a relatively moveable part

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