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BIOL 1412 (89)
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BIOL1412 02 12 2014.docx

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Department
Biological Sciences
Course
BIOL 1412
Professor
Paul Messing
Semester
Winter

Description
BIOL1412 02 12 2014 Muscle Characteristics: 1) Excitable - respond to stimuli and produceAPs 2) Contractile -can shorten, thicken 3) Extensible - stretch when pulled 4) Elastic - return to original shape after contraction or extension Muscle functions: 1) Movements - walking 2) Posture, facial expression 3) Heat production ⇒ 37ᵒ 4) Protection of viscera - body wall Neuronal Junctions (Fig. 9.8) - each muscle fibre (cell) innervated by only one neuron - axon and motor neuron branches to innervate several muscle fibres (Fig. 9.13) (1 neuron ⇒ 150 fibres w/in same whole muscle) - a single motor neuron + all the muscle fibres it innervates = a motor unit Structure: ⇒ presynaptic cell (neuron) w/ACh (nt) vesicles ⇒ post-synaptic cell (muscle) membrane (sarcolemma) - specialized w/ACh ( = motor
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