Cardiovascular System

HealthMrs. Wagner

Cardiovascular System

• Pathway through which blood can carry materials throughout the body (NC)

• Blood- Brings oxygen, nutrients and other necessary materials to your body cells- Carries waste products away- regulates body temperature and water balance

Heart

• Muscular organ that pumps blood throughout your body (NC)

• Size of your fist• Located near middle of chest• Each minute – pumps 5qts. of blood through

blood vessels

Structure of Heart

• Septum – thick wall that separates the left and right side (NC)

• Each side has 2 chambers1. Atrium – receives blood entering heart (NC)2. Ventricle – chamber that pumps blood from the heart to the rest of the body (NC)- blood flows from each atrium into ventricles

• Right Side Blood to lungs• Left Side Rest of body

Circulation

• Pulmonary Circulation – pathway that blood follows from the heart to the lungs (NC)

• Systemic Circulation – route that blood travels from the heart to most of the body and then back to the heart (NC)

Right Side of Heart

• Blood from most of the body flows into• Contains carbon dioxide – little oxygen• Passes from right atrium into right ventricle

pumps into lungs passes through lungs gains oxygen CO2 leaves blood passes into the air in lungs

From Lungs

• Oxygen rich blood returns to left side from lung

• Left ventricle pumps blood to the farthest points of the body

• Oxygen passes from the blood to body tissues and CO2 moves from tissues to the blood

• Oxygen poor blood then returns to the right side of the heart

Blood Vessels

• Arteries – thick walled, elastic vessels that carry blood AWAY from the heart (pulmonary circulation) (NC)

• Aorta – largest artery in the body (Systemic circulation ) (NC)* Blood leaves the left ventricle through aorta branches into many smaller arteries brain, stomach, kidney, bones, muscles, etc.

• Coronary Arteries – carry blood to the heart muscles ( NC)

• Arterioles – smaller blood vessels that form in an organ or a tissue (NC)

• Capillaries – smallest blood vessels in your body – pass through single file (NC)

• Venules – small blood vessels that join together to form veins (NC)

• Veins – large, thin walled elastic vessels that carry blood TO THE heart – valves prevent from flowing backwards (NC)

Blood Pressure• Force with which blood pushes against the walls

of the blood vessels (NC)- varies depending on activity- average – teens – 120/80

• Systolic Pressure – force caused by the surge of blood that moves as a result of the contraction of the ventricles ( first & highest number (NC)

• Diastolic Pressure – force recorded when the ventricles are relaxed (NC)

Heartbeat

• Pacemaker – group of cells that help regulate the rate at which the heart beats and contracts ( NC)

• Artificial are added