1. The Circulatory System
The Heart’s main structures
Atria-upper chambers of heart
Ventricles-lower chamber of heart
Septum-wall separating left and right side of heart
Aorta-the heart’s main artery
Pulmonary artery-connects heart to lungs

2. The Circulatory System
The right side of the heart pumps blood through the lungs.
The left side of the heart pumps blood through the rest of the body.
Turn to PG 77 in Book

3. The Circulatory System
Blood consists of 5 main parts
Plasma-makes up 55% of blood
Red Blood Cells-the part of blood that carries oxygen
White Blood Cells-attack invaders at site of infection, there are 5 varieties
Hemoglobin-moves oxygen about when it is needed, it is the red molecule in blood-protein in RBC
Platelets-release substances to help our blood clot

4. The Circulatory System
Blood Vessels
Arteries-carry blood from the heart to organs and cells in the body
Arterioles-small arteries
Capillaries-very small blood vessels that connect arterioles and venuls
Veins-carry blood back to the heart
Venuls-small veins

5. The Circulatory System
Coronary Arteries-provide blood and oxygen to all parts of the heart. There are two primary coronary arteries.
Cardiac Conduction System-
the electrical system that
enables the rhythmic
contractions of the heart.

6. Cardiac Conduction
Used in a graph called PQRST also known as an ECG (electrical cardiac Graph)

7. PQRST

9. The Circulatory System
Blood Pressure-surge of blood filling the vessels creates pressure against the vessel walls. It is measured by two #s
Systolic-top number which is the ventricle contraction. 120/
Diastolic-bottom number which is the ventricle relaxation. /80
Normal BP 120/80

10. The Circulatory System
Pulse is the rhythmical beating of the heart, it is the expansion and contraction of an artery as blood flows through it.
An athlete will have a slower pulse because the heart does not have to work as hard due to it being stronger than a non athlete.
Normal pulse in adults is resting

11. The Circulatory System
Arterial Bleeding-bleeding from punctured or severed artery, it is bright red and spurts according to hearts rhythm.
Venous Bleeding-bleeding from rupture of a vein, it is bluish-red and a steady flow.
Capillary Bleeding-bleeding from scratches, minor cut. Its oozes and is slow. This is what we typically see.

12. Shock Hemorrhagic Shock Respiratory Shock Neurogenic Shock
Cardiogenic Shock
Metabolic Shock
Anaphylactic Shock
Septic Shock
Psychogenic Shock