BIOM 3010 Lecture Notes - Lecture 2: Biceps, Agonist, Motor Neuron

• School: University of Guelph
• Department: Biomedical Sciences
• Course: BIOM 3010
• Professor: Matthew Vickaryous

Document Summary

Lecture 2 anatomy of the muscular system. 4 characteristics associated with muscle tissue: excitability, contractility, extensibility, elasticity. Important functions: movement, maintaining posture, supporting soft tissues within body cavities, guarding entrances and exits of the body, maintaining body temperature. Types of muscle tissue: skeletal, cardiac, smooth (visceral) Skeletal muscle tissue: associated with the skeleton, voluntary control, striated, cells are long, cylindrical & multinucleate. Involuntary controlled: striated, cells are short, branching and have a single nucleus, cells are connected to each other at intercalated discs. Smooth (visceral) muscle tissue: walls of organs and blood vessels, non-striated. Involuntary: cells are short, spindle-shaped & have a single nucleus, tissues are extremely extensible while still retaining ability to contract, found: around blood vessels, walls of digestive, respiratory etc. Skeletal muscle fibers shorten as thin filaments interact with thick filaments and sliding occurs. The trigger for contraction is calcium ions released by the sr when the muscle fiber s stimulated by its motor neuron.