The Circulatory Responses to Exercise. Chapter 9 Powers & Howley 7 th Edition. The Circulatory System. Cardiopulmonary system: works to maintain oxygen and carbon dioxide homeostasis in body tissues The cardiovascular system includes the heart, vessels, and blood
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Powers & Howley
The heart is divided into four chambers (two pumps in one)
Sinoatrial (SA) Node: Pacemaker of the heart
Atrioventricular (AV) Node: Located in floor of right atrium
Bundle of HIS, Bundle Branches, Purkinje Fibers
Electrocardiogram (ECG): A recording of the electrical changes that occur in the myocardium during the cardiac cycle
Contraction of chambers represented by P-wave, QRS complex, T-wave
Cardiac Cycle - one complete sequence of contraction and relaxation of the heart
Parasympathetic Nervous System
Sympathetic Nervous System
Length x viscosity
Q, SV, HR, BP, a-VO2 diff
Arterio-venous O2 difference (a-VO2 diff)
Redistribution of Blood Flow
Long-Term, Moderate to Heavy Submaximal Aerobic Exercise (Cardiovascular Drift)
Activation of motor cortex and higher areas of brain (central command)
Regulation of local blood flow during muscle contraction & relaxation
Central command, cont.
Local regulation, cont.