Muscles - PowerPoint PPT Presentation

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Title:

Muscles

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Title: No Slide Title Author: cfisd Last modified by: KISD Created Date: 2/21/2002 3:34:35 PM Document presentation format: On-screen Show Company – PowerPoint PPT presentation

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Tags: muscle | muscles | spasm

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Title: Muscles


1
Muscles
2
Function a. Muscles contract or
shorten b. Provide motility c. Move
substances through body- heart, blood
vessels digestion
3
FUNCTIONS d. Muscle tone - maintains posture
keeps organs in place e. Muscles generate
heat when worked
4
Types of muscles
1. Skeletal - Attached to bone a.
Voluntary b. Striated c. Multinuclei d.
Bundled cells e. Movement of body parts
5
2. Smooth - internal organs
a. Involuntary b. Not striated c. Only 1 nucleus
per cell d. Regulates other systems
6
Ex. Peristalsis moves food through digestive
system
7
3. Cardiac - found only in heart
a. Striated b. Involuntary c. Can contract
without nervous stimluation
8
d. Contracts relaxes continuously
Does not fatigue!
9
Movement
1. Occurs when shortened 2. Work In pairs
a. Flexor - muscle that flexes bone
b. Extensor - muscle that
extends bone
10
3. Tendons hold muscle to bone
11
Sliding Filament Theory
Muscles made of 2 filaments (actin myosin)
that slide over one another when they contract.
12
Sliding Filament Theory
Myosin
Actin
Relaxed
Contracted
13
Caring for your muscles
1. Stretch before after exercise lactic acid
can build up and cause soreness possible
injury 2. Without adequate exercise, muscles
will atrophy.
14
Caring for your muscles
3. Without proper nutrition, muscles may spasm
or become strained
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