Composition Of Blood Plasma (Plasma is mostly water) Formed Elements (The cells in blood are called formed elements) Erythrocytes (RBC’s_) Leukocytes (WBC’s) Platelets

Heart Aorta Artery Arteriole Capillary Bed Venule Vein Vena Cava 200mmHg 120mmHg 50mmHg

Differences Between Arteries and Veins Veins transport blood _______ from the heart Veins are _____ pressure vessels Veins have ______ toward low valves

Normal Blood Pressure Systolic Pressure – Maximum pressure during______________ Diastolic Pressure – Minimum pressure during _____________ Textbook Values:SP 120 mmHg (Systolic) DP 80 mmHg (Diastolic) ventricular contraction ventricular relaxation

Ruptured blood vessels in the retina associated with hypertension Hypertension = _______________ High Blood Pressure

The Sinoatrial Node (S.A. Node) ___________________ Impulse causes atrial contraction Arial contraction is forces the blood from the atria to flow into the ventricles What is the function of the atrio-ventricular node? It is an electrical connection between the atria an the ventricles with a 7/100 second delay to allow the atria to empty before the ventricles begin to contract.

The Cardiac Cycle Atrial emptying Ventricular Ventricular filling emptying P-wave Q R S QRS – complex7/100 second delay does what? It lets the atria completely empty before the ventricles begin to contract P-wave QRS complex T- wave