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human skeletal Muscles
skeletal muscles
32
Nursing
Undergraduate 1
06/18/2014

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Term
Skeletal tissue
Definition

Is voulntary, straited,many nucleses, parralell arragment

connective tissue

skeletal tissue

blood vessels

Nerves

Term
Functions of skeletal muscles
Definition

movment

body posture

support soft tissue

aids digestive and urinary system

body temp

nuttrient storage

Term
How is skeletal tissue attached to bones and diffirent points of attachemnt
Definition

Attached by connective tissue (tendons and aponerius)

origin is the point of attachment (little movment)

Inseration is the attachment at oppsit end (most movment)

Term
Agonists
Definition
Primer movers
Term
Antagonist
Definition
act oppiset of agonist
Term
Fixators
Definition
Help other muscels move more effeciently
Term
Synergiest
Definition
Act with other muscels to complete a task
Term
Nomencalture of skeletal muscle Shape
Definition

Tringle-deltoid

Rectangle-quadretus 

Dimoind-Rohmboid

Round-teres

Term
Nomencalture of skeletal muscle Size
Definition

Maximus-largest

Minimus-smallest

Longus-long

brevis-Short

Term
Nomencalture of skeletal muscle Location
Definition

Pectoralis-chest

Gulteus-butt

Term
Nomencalture of skeletal muscle Heads
Definition

Bicep-2

Tricep-3

Quadrocep-4

Term
Flexor
Definition
Reduces the angel between two bones
Term
Extensor
Definition
Increases the angel between two bones
Term
Abductor
Definition
Moves body part away from the midline
Term
adductor
Definition
Brings body aprt closer to midline
Term
Levator
Definition
Rasies body part
Term
Depressor
Definition
Lowers body part
Term
Supinator
Definition
Rotates body part to face fowards or up (twist palm of hand)
Term
Pronator
Definition
Moves body part to face down/backwards (palm of hand)
Term
Invertor
Definition
Turns body part inwards
Term
How are skeletal muscels attached to bone all three parts
Definition

Each muscel fiber is sournouded by Connective tissue (CT) called endomysium this is how blood and nerve fibers reach muscels by the Endomysium 

The muscle fibers are then grouped into fassicales these fasicales have a seeth made of perimysium 

 

 The muscle itself is covered by a connective tissue layer called the epimysium. The fascia, a layer of fibrous tissue that separates muscles from each other (deep fascia) and from the skin (superficial fascia).

 

Collagen fibers of the epimysium continue as a strong, fibrous tendon that attaches the muscle to a bone. The epimysium merges with the periosteum of the bone.

Term
Orginization of skeletal Muscles
Definition

Skeletal muscle is made out of fassicales seperated by perimusyum and surrounded by epimysum 

fasicle is made out of musccel fibers, sepereted by

endomysium sorounded by perimysum

Muscle fibers are the smallest functionl unit composed of myrofibrles surrounded by endomysium and contains axons and nurons 

Term
Endomyisum
Definition
Layer of areolar connective tissue that covers each and every muscle fiber alos has cappliaries and nerves
Term
Muscle fibers
Definition
Also known as the muscle cell special "cells" that allow for conraction and thus momvment
Term
Myofibrils
Definition
Small filliments located in the cytoplasm of straited muscle. these filliments contain protiens wih give them the muscle its shape
Term
Myosatilite cells
Definition
Stem cells that are a major player in muscel repair an grwoth think LIFTING
Term
Tell me about Thin Filiment
Definition
Main compent is actin actin forms twisting chains  Other two protiens are tryopmisin and troponin The molucules of tyropomyosin covers the myosin binding site during relaxation
Term
Tell me about thick filliment
Definition
Thick filliment formed from a protein called myosin Very elasticibility and contractibility shape is similer to twisted hockey sticks or cross bridges due to the myosin head and tail
Term
How dose Muscle contraction occur
Definition
The Brain sends a single to the Nuromuscular junction wich causes a influx of calium ions into the sarcoplasm the calium binds to Troponin C of the thin filiment causing a change that moves trypomyosin awawy from the head binding sites of the actin this allows the myosin head to ind to the thin filiment towards the sacromere ATP then binds to the myosin head causing it to uncouple from actin allowing prosses to start again
Term
Muscles at rest
Definition
At rest the muscle produces more ATP then needed wich is tunred into creatine wich then creates Creatine phosphate
Term
Muscels at work
Definition
Muscels use glucose by two pathways Ananbolic or Aerobic Each molucle produces 2 ATP and 2 pyruvate molocules if no o2 is present the pyruvate will change to lactic acid wich will lead to fatigue this is common in long strenous activity Aerobic resperation will break Pyruvate to befrom the nesscary actions 95% of the ATP needed daily is from aerobic
Term
how many total skeletal muscles
Definition
400 40-50% of the bodys weight
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