Class notes

Chapter 10

Muscular
Tissue



Lecture slides prepared by Curtis DeFriez, Weber State University
Copyright © John Wiley and Sons, Inc. All rights reserved.

,Overview of Muscular Tissue
 Types of Muscular Tissue
 Skeletal
 Cardiac
 Smooth
 Skeletal Muscle Tissue
 So named because most skeletal muscles move bones
 Skeletal muscle tissue is striated:
 Alternating light and dark bands (striations) as seen when examined
with a microscope
 Skeletal muscle tissue works mainly in a voluntary manner
 Its activity can be consciously controlled
 Most skeletal muscles also are controlled subconsciously to
some extent
 Ex: the diaphragm alternately contracts and relaxes without
conscious control


Copyright 2009, John Wiley &
Sons, Inc.

,Overview of Muscular Tissue
 Cardiac Muscle Tissue
 Found only in the walls of the heart
 Striated like skeletal muscle
 Action is involuntary
 Contraction and relaxation of the heart is not consciously controlled
 Contraction of the heart is autorhythmic and initiated by a node of
tissue called the “pacemaker”
 Smooth Muscle Tissue
 Located in the walls of hollow internal structures
 Blood vessels, airways, and many organs
 Lacks the striations of skeletal and cardiac muscle tissue
 Usually involuntary



Copyright 2009, John Wiley &
Sons, Inc.

, Overview of Muscular Tissue
 Functions of Muscular Tissue
 Producing Body Movements
 Walking and running
 Stabilizing Body Positions
 Posture
 Moving Substances Within the Body
 Heart muscle pumping blood
 Moving substances in the digestive tract
 Generating heat
 Contracting muscle produces heat
 Shivering increases heat production



Copyright 2009, John Wiley &
Sons, Inc.