KAAP220 Lecture Notes - Lecture 30: Oligodendrocyte, Myosin Head, Axon Hillock
19 Apr 2016
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Internal soft tissues: guard entrance/exit, heat production, by-product of muscle contraction, temp of homeostasis. Properties or functional characteristics (muscle tissue) (why is muscle different than connective tissue?) Irritability or excitability: responds to stimulus b. Initiate contraction: contractility, produce tension between its ends, **most distinguishing characteristic, cause movement, allows outside force to stretch muscle, extensibility, elasticity, ability to return to normal length after being stretched. Myofibrils- located in fiber"s sarcoplasm: long and narrow, = muscle cell cytoplasm, plasma membrane of muscle fiber. Endomysium: thin layer of ct, surrounds each muscle fiber, anchored to sarcolemma. Epimysium: groups of fascicles bundled together, surrounds whole muscle. Belly: part which contains the fibers and fascicles. Muscle tissue attachments: tendon- ct structure narrow and cord-like, aponeurosis- ct broad and flat. **muscle fibers do not run entire length of muscle. Microscopic composition of muscle: actin, myosin, myoglobin. Glycogen (polysaccharide) stored energy for muscle.
