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Chapter 9 - Muscle
MY A&P CHAPTER 9
40
Biology
Undergraduate 1
10/24/2011

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Term
Three types of muscle tissue
Definition
Skeletal, cardiac, and smooth
Term
Sarcolemma
Definition
plasma membrane of muscle cells
Term
Plasma membrane of muscle cells
Definition
Sarcolemma
Term
Muscle cell cytoplasm
Definition
sarcoplasm
Term
Obvious stripes on muscle cells
Definition
Striations
Term
Muscle tissue in the heart
Definition
Cardiac
Term
Cardiac muscle cells are Striated or Non striated?
Definition
Striated
Term
Found in the walls of hollow visceral organs
Definition
Smooth muscle tissue
Term
Smooth muscle has striations or not?
Definition
No striations
Term
Type of smooth muscle; its cells contract as a unit and rhythmically, are electrically coupled by gap junctions, and often exhibit spontaneous action potentials
Definition
Visceral muscle
Term
The ability to receive and respond to a stimulus
Definition
Excitablity
Term
the ability to shorten forcibly when adequately stimulated
Definition
Contractility
Term
Four functions of Muscles
Definition
1.Produce movement
2. Maintains posture
3. Stabilizes joints
4. Generates heat
Term
Skeletal muscle accounts for at least __% of body mass
Definition
40%
Term
Never endings contron the activity of which muscle fiber?
Definition
Skeletal
Term
An overcoat of dense irregular connective tissue that surrounds the whole muscle
Definition
Epimysuim
Term
Within each skeletal muscle, the muscle fibers are grouped into ______ that resemble bundles of sticks.
Definition
Fascicles
Term
Surronding each fascicle is a layer of fibrous connective tissue called
Definition
Perimysium
Term
A whispy sheath of connective tissue that surrounds each individual muscle fiber.
Definition
Endomysuim
Term
Endomysium conistis of fine ____ _____ _____
Definition
Areolar Connective Tissue
Term
Fibrous or membraneous sheet connecting a muscle and the part it moves
Definition
Aponeurosis
Term
A discrete bundle of muscle cells, segregated from the rest of the muscle by a connective tissue sheath.
Definition
Fassicle
Term
An elongated multinucleate cell; it has a banded (striated) appearance.
Definition
Muscle fiber
Term
Rodlike contractile elements that occupy most of the muscle cell volume. Composed of sacromeres arranged end to end, they appear banded, and hands of adjacent myofibrils are aligned.
Definition
Myofibrils
Term
The contractile unit, composed of myofilaments made up of contractile protiens.
Definition
Sarcomere
Term
Filaments contain bundled myosin molecules.
Definition
Thick Filaments
Term
Contain actin molecules (plus other protiens).
Definition
Think filaments
Term
The sliding of the tin filaments past the thick filaments produces muscle
Definition
shortening.
Term
Elastic finaments maintain the organazation of the _ band and provide for elastice recoil when muscle contraction ends.
Definition
A
Term
Sarcolemma
Definition
Plasma Membrane of the Muscle
Term
Cytoplasm of a muscle cell
Definition
Sarcoplasm
Term
A red pigment that stores oxygen
Definition
Myoglobin
Term
Each muscle fiber contains many rodlike __________ that run parallel to its length.
Definition
Myofibrils
Term
A repeating series of dark and light bands along the length of each myofbril
Definition
Striations
Term
Dark bands
Definition
A bands
Term
Light nds
Definition
I Bands
Term
H zone
Definition
Dark zone inside the A band
Term
Bisection of the H zone
Definition
M line
Term
Midle interruption of the I bands
Definition
Z disc
Term
The smallest contractile unit of a muscle fiber
Definition
Sarcomere
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