ANP 1105 Lecture Notes - Lecture 9: Aponeurosis, Organelle, Myocyte

• School: University of Ottawa
• Department: Anatomy and Physiology
• Course: ANP 1105
• Professor: William Staines

Document Summary

Figure 1: skeletal, cardiac, smooth (prefixes myo,sarco, eg myosin, sarcoplasm. Excitability/aka responsiveness: receives stimulus (neurotransmitter,ph change, electrical impulse generated along cell membrane. Contractility: shorten forcibly when stimulated(unique to muscle) Extensibility: ability to stretch, shorten when contracts/stretches when relaxes(even beyond resting length) Elasticity: recoil to resting length after stretching. Function of muscle: produce movement, skeletal : movement and manipulation, cardia(cid:272): blood (cid:272)ir(cid:272)ulatio(cid:374)(heart does(cid:374)"t (cid:373)ove (cid:271)ut pu(cid:373)ps (cid:272)ausi(cid:374)g (cid:271)lood circulation, smooth(inside walls of eg blood vessels, intestine, bladder): maintains bp, propels food/urine. Muscle attachments: muscles typically join bone-to bone or bone-tendon, when muscle contracts, one of these bones move, origin: point of attachment to immovable/less movable bond. Insertion: point of attachment to bone that moves: two types of attachments, direct/fleshy: epimysum fused to bone/cartilage. Indirect: epimysium extends beyond muscle as rope(tendon)/shee(aponeurosis) that attaches to bone/cartilage: tendons-small tough collagen fibers-withstand bony projections that would tear muscles. Muscle(organs): hundreds of thousands of muscle cells/fibers) Fascicle: (a portion of muscle): discrete bundle of muscle fibers.