Control of Cardiac Function: Autoregulation and Autonomic Nervous System's Role - Prof. Co, Study notes of Biology

Download Control of Cardiac Function: Autoregulation and Autonomic Nervous System's Role - Prof. Co and more Study notes Biology in PDF only on Docsity! 3 April Control of Cardiac Function Autoregulation Length force relationship Starling’s law Regulation of Cardiac Output CO ml/min = HR beats/min x SV ml/beat Applies under rest and repose conditions Autonomic Nervous Parasympathetic branch Innervation SA node – right vagus AV node – left vagus Atria only Neurotransmitter: acetylcholine ↑ K+ permeability (SA node) ↓ membrane potential (hyperpolarized) ↓ slope of prepotential Takes longer to reach threshold: ↓HR Rest and repose: vagal tone Intrinsic rate (SA node) Rest and repose: ↑ PANS Suppresses heart rate by 20 – 30 bpm Sympathetic branch