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25 Cards in this Set
- Front
- Back
- 3rd side (hint)
contractile unit in muscular tissue is called |
myocyte
which is also called muscle fiber. |
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The cytoplasm of muscle fibers or cells is called
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sarcoplasm
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Specific nomenclature associated with muscle commonly involves the prefix
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sarco- or myo-:
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The smooth endoplasmic reticulum of fibers or cells is called
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sarcoplasmic reticulum.
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The plasmalemma of fibers or cells is called the
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sarcolemma
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***
composite tissues are 3ct = |
**Epithelial glands
Muscular Nervous tissues are |
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Classification of muscle
Morphology two types |
A. cross-striations at right angles to long axis
= striated B. no cross striations = smooth |
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Classification of muscle
Function - two types : |
A. under voluntary control = voluntary muscle
B. not under voluntary control = involuntary muscle |
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Classification of muscle
3ct |
Striated voluntary (skeletal) muscle
Smooth involuntary muscle Striated involuntary (cardiac) muscle |
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Functions of Skeletal muscle:
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maintain posture
produce motion Heat production - 85% of body heat is produced by skeletal muscle |
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skeletal muscle 3 layers
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Epimysium
Perimysium Endomysium info |
All these connective tissue coatings (endomysium, perimysium and epimysium) contain collagen fibers, elastic fibers, fibroblasts and are richly vascularized. |
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Connective tissue arrangements of skeletal muscle
dense connective tissue surrounding the entire muscle. It is continuous with the deep fascia |
Epimysium
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The connective tissue around each bundle (fasciculus) of muscle fibers is called the perimysium.
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Perimysium
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a delicate layer of connective tissue, the endomysium, composed mainly of a basal lamina and reticular fibers.
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Endomysium
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Myo fibril layout
6ct |
H-band
Z-band A-band I-band M LINE Z-Sacrcomere-Z = myofibre |
Z to Z is the basic unit is the sarcomere.
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highly characteristic transverse striations- alternating dark and light areas
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Sarcoplasm
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**During embryonic development mesodermal cells differentiate into =
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uninuclear myoblasts
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Sarcoplasm also contains the
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the myoglobin-oxygen binding PROTEIN
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STAINING myo fibers
They are best demonstrated using an |
iron-haematoxylin stain.
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is due to the thick myosin filaments and stays constant
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A band
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band is due to the thin actin filaments and varies
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I band
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THE STRUCTURE BETWEEN TWO Z-LINES IS CALLED A
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SARCOMERE
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THE FUNCTIONAL UNIT OF CONTRACTION is called =
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SARCOMERE
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Sarcomere =
(visually equation) |
½ I + A + ½ I
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It marks the gap between the actin filaments
as they lie between the myosin filaments |
H band
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