Muscles.

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Presentation transcript:

Muscles

Function a. Muscles Contract-shorten and Relax-lengthen b. Provide mobility c. Move substances through body- heart, blood vessels & digestion

FUNCTIONS (cont.) d. Muscle tone - maintains posture & keeps organs in place e. Muscles generate heat when worked

Types of muscles 1. Skeletal - enables movement of body parts a. Voluntary b. Striated

2. Smooth - internal organs a. Involuntary b. Not striated

Ex. Peristalsis moves food through digestive system

3. Cardiac - found only in heart a. Striated b. Involuntary

d. Contracts & relaxes continuously Does not fatigue!

Movement 1. Occurs when shortened 2. Work In pairs: that flexes bone a. Flexor - muscle that flexes bone b. Extensor - muscle that extends bone

3. Tendons hold muscle to bone

Sliding Filament Theory Muscles made of 2 filaments (actin & myosin) that slide over one another when they contract.

Sliding Filament Theory Actin Myosin Relaxed Contracted

Caring for your muscles 101: 1. Stretch before & after exercise; otherwise, lactic acid will build up and cause soreness & possible injury 2. Without adequate exercise, muscles will atrophy. 3. Without proper nutrition, muscles may spasm or become strained