Physiology labs
Properties of the Isolated Mammalian If we were to compare smooth muscle with skeletal muscle we notice that they are very different from one another. Firstly, smooth muscles have a slow cycling of myosin cross bridges as compared to skeletal muscle. However, the fraction of time that the cross bridges remain attached to the actin filaments is believed to be greatly increased in smooth muscle. Secondly, Less energy is required to sustain the same tension of contraction in smooth muscle as in skeletal muscle. Thirdly, The maximum force of contraction of smooth muscle is often even greater than that of skeletal muscle. This great force of smooth muscle contraction results from the prolonged period of attachment of the myosin cross-bridges to the actin filaments. The Gastrointestinal tract has 2 major networks of nerve fibers - Myenteric plexus and the Submucous plexus. The plexuses are interconnected, and they contain motor neurons that innervate the smooth muscle. This is the enteric nervous system. The intestine also receives a dual extrinsic innervation from the autonomic nervous system, with p
The reason for this could have been that we didn't wash the intestine properly with Locke's solution to undo the effect of the earlier drug, epinephrine. They move the chyme to and fro and increase its exposure to the mucosal surface. Multi-unit smooth muscle is made up of individual units without interconnecting bridges. It strengthens the contractility of the myocardium thereby increasing the cardiac output. Segmentation contractions are ringlike contractions that appear at fairly regular intervals along the gut, then disappear and are replaced by another set of ring contractions in the segments between the previous contractions. The actions of acetylcholine on the heart mimic the effects of vagal stimulation. Method- As per the lab manual and course reader. When given in doses as small as the ones we administered in the GI motility lab, it shows very less effect. Visceral smooth muscle occurs in large bundles. It exhibits muscarinic activity and when compared with acetylcholine is far less potent.
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Vasopressin ADH,
Histamine Pilocarpine,
Calcium Calcium,
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Champe Constriction,
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Acceptance Essays
