Carries blood throughout the body Includes: Heart Blood Veins Capillaries Arteries

Is an organ A Pump 4 chambers Made of mostly cardiac muscle ~ the size of your fist almost in the center of your chest.

Heart Chambers Right Atrium Left Atrium Right Ventricle Left Ventricle The Atriums are the upper chambers… They send blood to the ventricles The Ventricles (work horse) are the lower chambers Send blood out of the heart

Oxygen-poor blood from the body comes into the right atrium Passes through the tricuspid valve to the right ventricle Passes to the pulmonary arteries and onto the lungs. What do you think the valves are for?

Oxygen-rich blood comes in from the lungs to the left atrium Passes to the left ventricle through the bicuspid valve Passes out to the body through the aorta.

Arteries  Arterioles  capillaries  venules  veins

 A for Away  Arteries take blood away from the heart.  Thick elastic walls lined with smooth muscles.  Heartbeat pumps blood at a high pressure › Called Blood Pressure › Stretch to withstand this pressure  Called pulse

Ventricles and Arteries: Pumping Blood from your Heart The Heart pumps blood through Arteries to the Lungs to collect Oxygen. Left VentricleRight Ventricle Artery Blood leaves the Heart through two ARTERIES. The Heart pumps blood through Arteries to supply Oxygen to the Body.

 Exchange site between body and blood.  Ex. nutrients, O 2, CO 2, and waste  Very thin=cells travel through in single file.

 Return blood to the heart.  Need valves to keep blood flowing in one direction.

Atriums and Veins: How Blood gets into your Heart Blood enters the Heart through two VEINS. Right Atrium Left Atrium The Body sends blood with no Oxygen in it through veins to the Heart. Veins The Lungs send blood with Oxygen in it through veins to the Heart.

 Pulmonary Circulation › Circulation between heart and lungs  Systemic Circulation › Circulation between heart and body

 Atherosclerosis › When cholesterol builds up in blood vessels  High Blood Pressure (hypertension) › Abnormally high blood pressure  Stroke › When a blood vessel in the brain becomes clogged or ruptures  Heart Attack › When heart muscles cells die  Heart Failure › When heart cannot pump enough blood to the body

Structure of Your Heart: Summary Right Atrium Left Atrium Right Ventricle Left Ventricle From Lungs To Lungs From Body To Body Blood from Veins into Heart Blood to Arteries out of Heart TricuspidBicuspid

Heart Structure 1.Aorta 2.Superior Vena Cava 3.Pulmonary Artery 4.Pulmonary Vein 5.Right Atrium 6.Tricuspid 7.Right Ventricle 8.Inferior Vena Cava 9.Pulmonary Artery 10.Pulmonary Vein 11.Left Atrium 12.Bicuspid 13.Aortic Semilunar Valve 14.Left Ventricle 15.Descending Aorta ******Parts to ADD 16. Septum 17. Pulmonary Semilunar valve 18. Myocardium