BIO 2870 Lecture Notes - Lecture 7: Aponeurosis, Anal Canal, Integumentary System
23 Aug 2016
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*3 types of muscle skeletal (voluntary sarcomere), cardiac, smooth. Blood is sent to lungs for oxygenation and sent through your body. Join cell membranes of adjacent cardiocytes (gap junctions, desmosomes-- structure, physically connect cardiocytes) Link heart cells mechanically, chemically, and electrically, the heart functions like a single, fused mass of cells (functional synctium) Controlled by pacemaker cells (self-sufficient to initiate action potential) *initiate and maintain cardiac function: variable contraction tension. Controlled by nervous system: extended contraction time. Ten times as long as skeletal muscle: prevention of wave summation and tetanic contractions by cell membranes. Important so that it doesn"t undergo wave summation. *muscle cells must complete twitch and recovery before the next muscle contraction can happen. *skeletal muscle note: skeletal muscle is able to respond if you give another stimulation before relaxation. (it can contract again) They have to come down all the way before responding to next stimulation.
