Chapter 19 The Cardiovascular System: The Blood. Fluids of the Body. Cells of the body are serviced by 2 fluids blood composed of plasma and a variety of cells transports nutrients and wastes interstitial fluid bathes the cells of the body
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Myocardium of left ventricle is much thicker than the right.
Which side is anterior surface?
What are the ventricles doing?
Ventricles contract, blood pumped into aorta and pulmonary trunk through SL valves
Atria contract, blood fills ventricles through A-V valves
Coordinates contraction of heart muscle.
Cells fire spontaneously, act as pacemaker and form conduction system for the heart
cluster of cells in wall of Rt. Atria
begins heart activity that spreads to both atria
excitation spreads to AV node
in atrial septum, transmits signal to bundle of His
AV bundle of His
the connection between atria and ventricles
divides into bundle branches & purkinje fibers, large diameter fibers that conduct signals quickly
Where to listen on chest wall for heart sounds.
Circle of Willis