BIOL 207 Lecture Notes - Lecture 10: Smooth Muscle Tissue, Skeletal Muscle, Gap Junction
Document Summary
Smooth muscle contractions are slower than skeletal muscle. At contraction - actins and myosins can hold crossbridges for longer time longer relaxation period - takes longer for calcium to get out of cell. Neurotransmitters if stimulate bronchioles w/ norepinephrine, tubes dilate. Ach in smooth muscle causes contraction of bronchiole tubes. When release norepinephrine in blood vessels they contract. Neurotransmitters can be stimulated or inhibitory depending on receptors. 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. Most smooth muscles are unitary cells are interconnected few neurons. Some smooth muscles are multi unit small muscles stimulated by neurons in motor units. A lever is a rigid bar moving on fixed point called fulcrum. 3 classes of levers in body: - fulcrum is b/w load and force.
