1. 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
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2. Skeletal Muscle Tissue
Figure 4.14a
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3. Skeletal Muscle

4. Skeletal Muscle

5. Smooth muscle 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

6. Smooth Muscle Tissue Figure 4.14c
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7. Smooth muscle

8. Smooth Muscle

9. Smooth Muscle

10. Cardiac Muscle Tissue Figure 4.14b
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11. Cardiac muscle LOCATIONS: walls of heart (myocardium)
APPERANCE: striated with branched cells, single nuclei, and intercalated discs
FUNCTIONS: involuntary beating of heart
Nucleus
Cardiac muscle cells
Intercalated discs are made of gap junctions AND desmosomes (like rivets)
Intercalated discs
Striations
Cardiac muscle

12. Cardiac muscle, longitudinal section

13. Cardiac Muscle
Intercalated discs

14. Neuromuscular junction
Motor neuron
Neuromuscular junction
axon

15. NOTE: Each muscle fiber is innervated by only ONE neuron
Neuromuscular junction
NOTE: Each muscle fiber is innervated by only ONE neuron

16. V. Muscle Tissue
Smooth
Skeletal
Cardiac
Neuromuscular junction

17. Neuromusclular Junction