BIOL 1117 Study Guide - Midterm Guide: Atp Hydrolysis, Skeletal Muscle, Myocyte
9 Jan 2019
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Stimulation of smooth muscle: can contract/relax to temperature and chemcial stimuli, mechanically sensitive (due to stretch); autorhythmic : (spontaneously depolarizes) Inputs alter cytosolic calcium levels influence contractile activity. C: may lack nerve fibers contract w/o change in membrane potential, most = innervated by autonomic nerve fibers (like cardiac, unlike skeletal, autonomic nerve fibers : trigger/modify contractions; stimulate w/ acetylcholine/norepinephrine (nt effects depend on receptor) Contraction and relaxation: myosin atpase uses energy; slower ca removal (exit cell, not sr) hard to fatigue, relaxaion: ca 2+ , myosin dephosphoryl. Iv: eg. a stretched urinary bladder can still contract. Properties of neurons: excitability : respond to stimuli; muscle neurons developed this to highest degree, conductivity : conduct electrical signals to cells quickly, secretion : neurotransmitter is secreted; cross synapse to stimulate postsyn. Cell: sensory (afferent) neurons: detect stimuli, transmit info. about stimuli to cns. Interconnect incoming sensory pathways w/ outgoing motor pathways of cns.
