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Chapter 10: Muscle Anatomy and Physiology
N/A
11
Anatomy
Undergraduate 3
04/13/2014

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Term
Skeletal Muscle Functions
Definition

1. Produce skeletal movement

2. Maintain posture and body position

3. Support soft tissues

4. Guard entrances and exits

5. Maintain body temperature

6. Store nutrient reserves

Term
Epimysium
Definition
A dense layer of collagen fibers that surrounds the entire muscle
Term

Perimysium

 

Definition

Divides the skeletal muscle into a series of compartments, each containing a bundle of muscle fibers called a fascicle.

 

Contains collagen and elastin, blood vessels and nerves 

Term
Endomysium
Definition

Surrounds the individual skeletal muscle fibers. Loosely interconnects adjacent muscle fibers. 

 

Elastic layer; contains capillary networks and myosatellite(stem) cells and nerve fibers. 

Term
Myoblasts
Definition
Groups of embryonic cells
Term
Sarcolemma
Definition
Plasma membrane of a muscle fiber, surrounds the sarcoplasma
Term
Transverse tubules(T tubules)
Definition

Narrow tubes that are continuous with the sarcolemma and extend deep into the sarcoplasm.

 

They are filled with extracellular fluidand form passageways through the muscle fiber. Electrical impulses carried by the sarcolemma travel along the T tubules to the cell interior.

Term
Action potential
Definition
An electrical impulse that triggers muscle fiber contraction.
Term

Myofibrils

 

Definition

Cylindrical structuresthat actively shorten and are responsible for skeletal muscle fiber contraction

 

1-2 micrometer diameter

Term
Myofilaments: Thick and Thin
Definition

Thin: Composed primarily of actin 

Thick: Composed primarily of myosin

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