Copyright © 2005 Pearson Education, Inc., publishing as Benjamin Cummings

Muscle Tissues

Muscle tissues• Skeletal (striated) muscle

• Used to move skeleton• Cardiac muscle

• Intercalated discs• Smooth muscle

• Found in hollow organs and blood vessel walls

Copyright © 2005 Pearson Education, Inc., publishing as Benjamin Cummings

Skeletal Muscle Tissue

Figure 4.14a

Skeletal Muscle

Skeletal Muscle

Smoothmuscle

cell

Nucleus

Smooth muscle

APPERANCE: not striated, single nuclei

LOCATIONS: Encircles blood vessels; found in walls of hollow organs (digestive tract, etc)

FUNCTIONS: Involuntary movement of food, and secretions; control of vessel diameter

Copyright © 2005 Pearson Education, Inc., publishing as Benjamin Cummings

Smooth Muscle Tissue

Figure 4.14c

Smooth muscle

Smooth Muscle

Smooth Muscle

Copyright © 2005 Pearson Education, Inc., publishing as Benjamin Cummings

Cardiac Muscle Tissue

Figure 4.14b

NucleusCardiacmuscle

cellsIntercalated

discs

Striations

Cardiac muscle

APPERANCE: striated with branched cells, single nuclei, and intercalated discs

LOCATIONS: walls of heart (myocardium) FUNCTIONS: involuntary beating of heart

Cardiac muscle, longitudinal section

Cardiac MuscleCardiac Muscle

Cardiac Muscle

Intercalated discs

Neuromuscular junctionNeuromuscular junction

axon

Neuromuscular junction

Motor neuron

NOTE: Each muscle fiber is innervated by only ONE neuron

Neuromuscular junctionNeuromuscular junction

Skeletal

Cardiac

Smooth

V. Muscle TissueV. Muscle Tissue

Neuromuscular junction