04.13 - Auto-depolarisation: Pace Maker Cells ( SA node )...

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The Somatic Motor System Muscles: Skeletal Smooth (enteric-vascular) Cardiac and their innervation
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Troponin Calcium Myosin head Tropomyosin ATP
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Motor Unit 1 Motor Unit 2 Temporal Summation Tetanus “Twitch”
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Transverse Tubule Sarcoplasmic Reticulum Di - hydropyidine Receptor ( DHPR ) Ryanodine Receptor ( voltage - gated ) ( mechanically - gated )
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Cardiac Striated Smooth Cardiac multi - nuclear ( syncitium ) mono - cellular mono - cellular Sarcoplasmic Reticulum ER Organised sarcomeres Unorganised sarcomeres Semi - Organised sarcomeres Sarcoplasmic Reticulum each fbre enervated generally enervated locally enervated ( nicotinic ) ( muscarinic ) ( adrenergic ) isolated gap junctions gap junctions motor neuron stimulus autonomic stimulus auto - depolarisation autonomic stimulus
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Top of heart contracts Frst then the bottom
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Striated muscles Cardiac muscles
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Unformatted text preview: Auto-depolarisation: Pace Maker Cells ( SA node ) No true resting potential Spontaneous action potentials Striated Smooth Cardiac motor neuron stimulus autonomic stimulus auto-depolarisation autonomic stimulus ACh --> nicotinic receptors ACh --> muscarinic receptors ACh --> muscarinic receptors NE --> adrenergic receptors gNa & gK gCa gK gNa & gCa gK gNa & gCa Striated Smooth Cardiac motor neuron stimulus autonomic stimulus auto-depolarisation autonomic stimulus ACh --> nicotinic receptors ACh --> muscarinic receptors ACh --> muscarinic receptors NE --> adrenergic receptors gNa & gK gCa gK gNa & gCa gK gNa & gCa Para-Sympathetic Sympathetic Autonomic Nervous System ACh NE...
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04.13 - Auto-depolarisation: Pace Maker Cells ( SA node )...

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