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Muscle Tissue, Alternative of light and dark cross-bands, Myoblast
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Muscle Tissue
Properties
Extensibility
- Ability of muscle to stretch w/o being damaged
Elasticity
- Ability of muscle to return to its original length and shape after contraction and extension
Contractibility
- Ability of muscle to contract forcefully when stimulated
Electrical excitability
- Ability to respond to certain stimuli (action potential)
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- Consist of : Elongated cells call muscle fibers that can use ATP to generate force
- Arrangement: Parallel array - work together effectively
- Function: Body movements, posture maintenance, generates heat & for changes in size and shape of its internal organs
- Characterized by aggregates of specialized cells whose primary role is contraction
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- Present only in the heart
- Involuntary & striated
- Shape: branched cylinders with one central nuclei
- Attached to and communicate with each other by intercalated discs and desmosomes
- Highly specialized end-to-end junctions
- Junctional complexes at the interface between adjacent cardiac muscle cells
- Voluntary/ conscious control and striated (visible light and dark banding)
- Shape: Long cylinders with multinucleated peripheral nuclei
- Skeletal movement
- Posture and body position
- Support of soft tissue
- Guarding of entrances and exits
- Maintenance of body temperature
- Location: Walls of hollow organs(blood vessels, GI tract, bladder)
- Lack striations and involuntary (regulated by hormones, ANS &local)
- Shape: Spindle with a single central nuclei, fusiform features
- T tubules-absent
- Bundles of myofilaments crisscross obliquely through the cell