Muscular System

All I ever do is contract!

Types of Muscle

! Skeletal

! Cardiac

! Smooth

Functions

! Movement

! Stability and posture

! Communication

! Sphincter Control

! Thermoregulation

! Cardiovascular pump

Characteristics of M.T.

! Mostly cells

! Relatively little

matrix

! Directly

vascularized

! Directly innervated

Properties of M.T.

! Excitability

(Irritability)

! Contractility

! Extensibility

! Elasticity

Properties of Skeletal Muscle

! Typically

Voluntary

! Striated

! Fiber Types

" Fast-Twitch

" Slow Twitch

Anatomy – Gross to Micro

The Big Picture

Shapes of Whole Muscle

Anatomy – Gross to Micro

! Muscle

! Fasciculi

! Muscle Fiber

! Myofibril

! Sarcomere

! Myosin and Actin

myofilaments

C.T. in Skeletal Muscle

! The 3 Mysium

brothers:

" Epimysium

" Perimysium

" Endomysium

Microscopic View

Skeletal Muscle Cell

Myofilaments