This preview shows page 1. Sign up to view the full content.
Unformatted text preview: The Muscular System Three types of muscle • Skeletal muscle attaches to and moves bone – is striated – is voluntary • Smooth muscle located in the walls of internal structures – nonstriated – Involuntary • Cardiac muscle Functions of Muscle Tissue • Motion • Movement of substances within the body • Stabilizing body position and regulating organ volume – maintaining posture – maintaining food storage in stomach • Heat production – muscle contraction generates 85% of the body’s heat Characteristics of Muscle Tissue • Excitability receive and respond to stimuli • Contractility ability to shorten and thicken • Extensibility ability to stretch • Elasticity ability to return to its original shape after contraction or extension General Anatomy of Skeletal Muscle • origin stationary end of muscle attachement • insertion mobile end of attachment • belly thicker middle region Structure of Skeletal Muscle Connective tissue components • fascia sheets or bands of fibrous c.t. around organs, muscle and beneath the skin – superficial fascia (subcutaneous layer) composed of areolar c.t. and adiose tissue and is located under the skin – deep fascia composed of dense, irregular c.t. that holds muscles together and from which the various subdivisions of muscle c.t. are derived In hand and eye there are fewer than 100 fibers per motor unit; in lower leg there are 1000 fibers per motor unit Production of ATP in Muscle Fibers • Muscles have three ways to produce ATP – from creatine phosphateunique to muscle tissue – anaerobic cellular respiration using glycogen – aerobic cellular respiration us...
View Full Document
- Spring '06