KIN 2500 Chapter : Ch 10 Muscle Tissue

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Ch. 10: Muscular Tissue
Myology: study of muscles
Classification of muscle tissue (3 kinds):
1. Skeletal-
a. Involuntary or voluntary?
voluntary
b. Striated or non-striated?
Striated
c. Where is it found?
Whole body and attached to bones and skin
2. Cardiac-
a. Involuntary or voluntary?
Involuntary
b. Striated or non-striated?
striated
c. Where is it found?
The heart
3. Smooth-
a. Involuntary or voluntary?
involuntary
b. Striated or non-striated?
Non striated
c. Where is it found?
Blood vessels, airways, most organs, and abdominal pelvic cavity
Characteristics of muscle tissue:
Elasticity
Contractility
Conductivity
Excitability
Extensibility
1. Excitability - the ability of a muscle fiber to receive and respond to a stimulus
2. Contractility - the ability of muscles to shorten (contract) in response to a stimulus
3. Extensibility - the ability of muscle tissue to stretch (without being damaged)
4. Elasticity - the ability of a muscle to return to its original shape after contraction or extension
5. Conductivity - the ability to propagate a signal through a muscle
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Structure of a muscle
1. Muscle belly - the largest or thickest part
2. Tendon - connects the body of the muscle to bone
a. Made up of parallel rows of what type of fibers?
Collagen fibers
3. Extensions of 3 connective tissue layers that surround layers of skeletal muscle
a. Epimysium
i. What does it surround?
1. Surrounding periphery of the muscle, binds all the fascicles together to
form the muscle belly
b. Perimysium
i. What does it surround?
1. Muscle fibers
c. Endomysium
i. What does it surround?
1. Surrounds each muscle fiber, connective tissue helps bind the muscle
fibers together
4. Parts of the muscle cell
a. Sacrolemma- plasma membrane of the muscle fiber
b. Sacroplasm - the cytoplasm within a muscle cell (between the myofibrils)
c. Myofilaments make up filaments which make up myofibers (largest)
d. Myofibrils:
i. Thin filaments are made up of the protein Actin
ii. Thick filaments are made up of the protein myosin (attaches to thin filament
and pulls each other)
iii. The pattern of overlap of thick and thin bands consist of zones and bands which
make up the striated appearance of muscles
e. Sarcomere
Zone of overlap
M line
H zone
A band
I band
Z disc
i. Z discs - separates one sarcomere from the next
ii. A Band - the darker, middle part of the sarcomere
iii. Zone of Overlap- the end of each A band where thick and thin filaments lay side
by side
iv. I band- the lighter area that only contains thin filaments
v. H zone - an area in each A band where there are thick filaments but no thin
filaments
vi. M line - a region in the H zone; the middle of the sarcomere
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Document Summary

10: muscular tissue: myology: study of muscles. Classification of muscle tissue (3 kinds): skeletal- Whole body and attached to bones and skin: cardiac- Blood vessels, airways, most organs, and abdominal pelvic cavity. Steps of the nmj (put these in order from 1-4: action potential is produced, termination of ach. Ach is broken down and muscle action stops: activation of ach receptors. Ach binds to ach receptors: release of acetylcholine (ach) from the synaptic vesicle, d 2. The contraction cycle: what happens to the z discs during contraction, decrease to half the resting length and draws them towards each other. Small amount of tautness or tension in the muscle to weak, involuntary contraction of its motor units. Isometric - muscle does not change in length, there is no visible movement. Isotonic - tension in the muscle remains constant while the muscle changes in length. Slow oxidative: what about a sprinter, fast glycolytic muscle.

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