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Three Major Elements – Heart, Blood Vessels, & Blood
Transcript of Three Major Elements – Heart, Blood Vessels, & Blood
Cardiac muscle tissue
Highly interconnected cells
Blood Circulatory System
Superior Vena Cava
Pulmonary Semilunar Valve
Aortic Semilunar Valve
To the bodies organs & cells
Pathway of the blood
The pathway between the left and right sides of the heart.
The blood pathway between the right side of the heart, to the lungs, and back to the left side of the heart.
Functions of the Heart
Regulating blood supply
Heart separates pulmonary and systemic circulations
Heart valves ensure one-way flow
Changes in contraction rate and force match blood delivery to changing metabolic needs
Generating blood pressure
Ensuring one-way blood flow
Blood Flow Through Heart
Systemic and Pulmonary Circulation
Long refractory period prevents tetanic contractions
Absolute: Cardiac muscle cell completely insensitive to further stimulation
Relative: Cell exhibits reduced sensitivity to additional stimulation
Blood moves through circulatory system from areas of higher to lower pressure.
Heart is two pumps that work together, right and left half
Repetitive contraction (systole) and relaxation (diastole) of heart chambers
Contraction of heart produces the pressure
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