EHS 350 Lecture Notes - Lecture 6: Skeletal Muscle, Gap Junction, Bronchiole
19 Jun 2017
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Document Summary
Smooth muscle contractions are slower than skeletal muscle longer relaxation period - takes longer for calcium to get out of cell at contraction - actins and myosins can hold crossbridges for longer time neurotransmitters. Ach in smooth muscle causes contraction of bronchiole tubes if stimulate bronchioles w/ norepinephrine, tubes dilate. When release norepinephrine in blood vessels they contract neurotransmitters can be stimulated or inhibitory depending on receptors. Chemicals that cause contraction/ relaxation hormones carbon dioxide. Smooth muscle functions smooth muscles can contact from 50% ideal length to 150% ideal length can contract at many lengths cells can contract in response to stretch adapt to stretch. Most smooth muscles are unitary cells are interconnected few neurons. Some smooth muscles are multi unit small muscles stimulated by neurons in motor units no gap junction ex. Section 10. 4- levers a lever is a rigid bar moving on fixed point called fulcrum. Nervous system control + communicating system for body.
