PHYL2001 Study Guide - Final Guide: Sinus Venosus, Atrioventricular Node, Sinoatrial Node
LAB 1: PHYL2001
-Contraction of heart under control of SA node on RA
-SA node has specialised pacemaker cells, rhythmically producing electrical signal, initiating
contraction of heart
-Travel through internodal pathway in RA, throughout atrial tissue via gap junctions
-At the same time, electrical messages reaches LA via interatrial pathway
-As electrical signal reaches both atria simultaneously, the atria contract together and blood
pumped to ventricles
-RA internodal pathway also deliver signs to AV node, which slows signal and allowing time for
atria to contract and ventricles to fill with blood
-Then to V via BoH, then ventricular muscle tissue via PF = ventricular contraction and ejection
from the heart
-3 chamber heart with 2 separate atria and 1 ventricle
-Deoxygenated blood reach heart via veins, draining into sinus venosus (similar to SA node)
-Blood then passes from SV to RA, then to single V, then directed to arteries -> lungs
Document Summary
Contraction of heart under control of sa node on ra. Sa node has specialised pacemaker cells, rhythmically producing electrical signal, initiating contraction of heart. Travel through internodal pathway in ra, throughout atrial tissue via gap junctions. At the same time, electrical messages reaches la via interatrial pathway. As electrical signal reaches both atria simultaneously, the atria contract together and blood pumped to ventricles. Ra internodal pathway also deliver signs to av node, which slows signal and allowing time for atria to contract and ventricles to fill with blood. Then to v via boh, then ventricular muscle tissue via pf = ventricular contraction and ejection from the heart. 3 chamber heart with 2 separate atria and 1 ventricle. Deoxygenated blood reach heart via veins, draining into sinus venosus (similar to sa node) Blood then passes from sv to ra, then to single v, then directed to arteries -> lungs. Some blood directed to skin (amphibians can absorb oxygen on skin)
