Muscles MUSCLES (“pick things up”)

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Presentation transcript:

Muscles MUSCLES (“pick things up”)

Generate motion Generate force Some muscle tissues generate heat

Voluntary; Response to Somatic Motor Neuron w/ACh (AP), Striated. Movement of skeleton and skin. (fastest) Involuntary*; Autonomic, Important for homeostasis, wide variety (6: H. sapiens), Act as integrating centers in response to endocrine system, Not striated. Lines GI, walls of viscera [stomach, urinary bladder & GI]. (slowest) Involuntary*, Autonomic, Shares BOTH smooth & skeletal muscle, striated, electrically linked. Under sympathetic, parasympathetic & hormonal control. Specialized muscle for the heart. (intermediate)

This sliding filament mechanism can only occur when there are sufficient calcium ions (Ca 2+ ) and sufficient ATP is also available.ATP

Slow: Aerobic for continuous movement. Less likely to fatigue. Fast: IIa: Anaerobic & aerobic. IIb: Anaerobic and fastest contraction of all muscle fibers. Highest rate of fatigue.

Check your Standards for Study Describe the four characteristics of muscle tissue. (elasticity, excitability [irritability], extensibility, flexibility) Contrast the general location, microscopic appearance, control, and functions of the three specific types of muscle tissue. (skeletal, smooth, cardiac) Contrast thick and thin myofilaments Describe the sliding-filament theory of muscle contraction Describe what occurs at the neuromuscular junction Define the terms “origin” and “insertion.” Explain the role of prime movers (agonists), antagonists, synergists, and fixators.

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