The Heart

How many times a day does your heart beat? a. over 10,000 times b. over 100,000 times c. over 1,000,000 times d. over 10,000,000 times

the name given to the heart, blood vessels and blood which transport oxygen and nutrients to all parts of the body as well as carry away waste products Circulatory System

Medieval beliefs about the circulatory system: Blood was like a tide that oozed in all directions without a particular path. The heart controlled the emotions. The heart controlled the emotions. The heart controlled the emotions. The heart controlled the emotions. The heart controlled the emotions. The heart controlled the emotions.

Components of the Circulatory System blood connective tissue made of plasma and cells heart muscular pump to move blood blood vessels veins, arteries, capillaries that deliver blood to all parts of body

Structure of the Heart

hollow, muscular organ about the size of your clenched fist pumps about 3,400 gallons/blood a day can pump up to 12 gallons per minute primary organ of circulatory system

Right Atrium Left Atrium Right Ventricle Left Ventricle 4 chambers

aorta pulmonary artery main artery of the circulatory system only artery that carries oxygen-poor (deoxygenated) blood

a valve between each ventricle of the heart and the artery connected to that ventricle, preventing blood from flowing back into the heart wall separating two ventricles preventing mixing of blood septum semilunar valves

Identify the parts of the heart. Which part sends blood to all parts of the body? Which parts are the ventricles? Which parts are the atria? What single term describes structures 2, 3, 4, and 6?

Circulation

Blood Flow through the Heart

Blood flows from two large veins into the right atrium. Step 1

The blood then flows down to the right ventricle Step 2

From the right ventricle, blood is pumped to the lungs where CO 2 is exchanged for O 2. Step 3 (CO 2 - waste product from cells)

After O 2 is added in the lungs, blood returns to the left atrium. Step 4

The blood is then sent to the left ventricle. Step 5

The left ventricle pumps blood away from the heart to the rest of the body via the aorta. Step 6 aorta - main artery of the body

lungs Blood leaves the heart, passes through arteries until it reaches capillaries located throughout the body.

lungs In the capillaries, CO 2 and waste products are exchanged for O 2 and nutrients.

lungs Blood returns to heart through the veins.

deoxygenated blood TO lungs oxygenated blood FROM lungs

Gas Exchange

tissuealveoli O2O2 O2O2 O2O2 O2O2 O2O2 O2O2 O2O2 O2O2 CO 2 capillary CO 2 O2O2 Gas exchange occurs between the thin walls of the alveoli and the thin walls of the capillaries. CO 2 O2O2 O2O2 O2O2 O2O2 O2O2 O2O2 O2O2 O2O2 O2O2 O2O2

Heart Disorders

What happened to David Letterman???

Coronary Bypass Surgery a type of open heart surgery Chest is opened. Heart is exposed but not opened. Involves two surgeons.

One surgeon works on the chest. Another surgeon takes a length of vein from inside the lower leg.

black areas - blockages damaged heart tissue due to insufficient blood supply

vein(s) sewn (grafted) on outside of heart above blockage(s) and below blockage(s)

double bypass triple bypass

commonly called CABG-- pronounced “cabbage” C - coronary A - artery B - bypass G - graft Coronary Bypass Surgery

Now, put on your scrubs and let’s do a heart transplant. Heart Transplant