BIOL 141 Lecture Notes - Lecture 4: Sliding Filament Theory, Neuromuscular Junction, Endoplasmic Reticulum
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Functions of muscles: movement, heat production, support - posture, support/protection internal organs e. Control exit/entry points into the body: body language/facial expressions, help store nutrients g. i. Respond to chemicals released from motor neurons: conductivity b. i. Ability to propagate electrical signals over membrane: contractility c. i. Ability to shorten and generate force: elasticity d. i. Ability to return to original shape after being stretched: extensibility e. i. Ability to be stretched without damaging the tissue. Attached to bone, skin, or fascia (connective tissue: cardiac. Combining nervous and muscle systems: efferent nerves communicate with periphery, somatic motor nerves communicate with muscles (voluntary, visceral motor nerves communicate with organs (involuntary) Nervous and skeletal muscle systems: nerves consist of many axons b, neurons and muscle cells communicate at the neuromuscular junction. Electrical signal from the neuron is converted into a chemical message c. iii. Muscle cell converts it back to an electrical signal c. iv. Electrical signal (muscle action potential) causes sarcomere proteins to interact c. v. contraction c. vi.
