http://www.youtube.com/watch?v=NYB-rJZQt4w&feature=fvw http://www.youtube.com/watch?v=QSLqixBjGkE&feature=related http://www.youtube.com/watch?v=-dz1BHzyabk&feature=related http://www.youtube.com/watch?v=xw8B6KPZokQ&feature=related
The Heart
What is the function of the heart? What kind of tissue is the heart made of?
Pig heart
The Heart - a muscular organ that pumps blood through the circulatory system
Your pumps 5 liters of blood every minute Your pumps 5 liters of blood every minute. How many liters of blood does it pump every day? 7,200 liters/day
Your beats 100,000 times a day. How many times does it beat in a lifetime of 75 years? 2.7 billion times
How is the heart adapted for transport?
Left Side Right Side
What is the internal structure of the heart?
4 chambers (open spaces in heart)
Atria two chambers on top Ventricles two chambers on bottom
Left Atrium Right Atrium Left Ventricle Right Ventricle
How are the atria and the ventricles different?
Left Atrium Right Atrium Left Ventricle Right Ventricle
Atria receive blood from the body and lungs Atria pump blood to ventricles Ventricles pump blood to the body and lungs
How is the left ventricle different from the right ventricle? L.V. R.V.
Why is the heart really two pumps in one?
Heart animation http://www.smm.org/heart/heart/pumping.htm http://www.innerbody.com/anim/heart.html
Superior Vena Cava InferiorVena Cava Pulmonary Veins Aorta L.A. R.A. L. V. R. V. Aorta Pulmonary Artery Septum
S. vena cava Aorta P. artery P. Vein R. Atrium L. Atrium R. Ventricle L. Ventricle Septum I. Vena Cava
Starting with the right atrium, list the numbers of the structures blood passes through until it reaches the right atrium again 3 4 2 7 8 9 6 1 (or 5)
Animation of bloodflow through the heart http://www.youtube.com/watch?v=H04d3rJCLCE&feature=related
Put numbers in the circles (1 and 9 are already done) Label A, B, C, D, E, F, G Color Oxygenated blood red and deoxygenated blood blue
Trace the path of a red blood cell from a capillary in the brain through the circulatory system and back to a capillary in the brain again. List all the structures it passes through.
Capillary in toe Artery to the leg Artery to all body tissues Left side of the heart Lungs Right side of the heart Vein from the leg Capillary in toe
What causes blushing?
A, B, C, and D represent different activities A, B, C, and D represent different activities. Which letter represents the following: eating exercising sitting in a hot moist sauna resting C A D B
14 13
What causes the sound of the heartbeat?
Stethoscope a medical instrument for listening to the sounds generated inside the body
As the valves open and close, they make a “lub-dub” sound. Heartbeat As the valves open and close, they make a “lub-dub” sound.
“lub” “dub”
Tricuspid: valve on right. Bicuspid: valve on left. Semilunar valves: move blood from ventricles to arteries. Stop blood backflow.
Control of the Heartbeat The heart has a built in ability to contract – even when outside the body. SA Node & AV Node: Groups of specialized cells that cause atria and ventricles to contract.
Pacemaker
Heart Transplant – transporting heart http://www.youtube.com/watch?v=4wu-awJxnv0&feature=related
What is blood pressure?
Ventricles contract, Atria relax Ventricles relax, Atria contract The pressure exerted by the blood against the walls of the blood vessels, especially the arteries Blood Pressure Ventricles contract, Atria relax Ventricles relax, Atria contract 120 / 80 sphygmomanometer
Taking someone’s blood pressure http://www.youtube.com/watch?v=u6saTO8_o2g
Measuring Blood Pressure Check Pulse Inflate Cuff while listening w/stethoscope till you can’t hear the pulse Inflate a bit more (unless it hurts!) Release pressure gradually with valve When you hear 2 consecutive pulses take first reading (systolic pressure) Continue releasing pressure gradually When you can’t hear the pulse anymore take the second reading (diastolic pressure)
S. Vena cava Aorta Pulm. Artery Pulm. Vein L. Atrium L. Ventricle Vena Cava R.Ventrivle R. Atrium Septum
6 3 2 5 4 H A R V E Y