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

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

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

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

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.

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

PQRST

http://www.youtube.com/watch?v=v3b-YhZmQu8

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

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 60-80 resting

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.

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