L. Lindahl Mahtomedi Public Schools ISD 832 2/27/2018 Cardiac Cycle L. Lindahl Mahtomedi Public Schools ISD 832

Introduction We will review the Cardiac Cycle Identify where a drop of blood flows beginning with the Vena Cava

You are a blood drop starting in the Vena Cava There are two of them: Superior and Inferior Very large and roomy blood vessel Where will you go next?

Right! The Right Atrium TOP You just entered one of the __________ chambers of the heart. You are separated from the rest of the chambers by a valve. Valves help to: prevent blood from flowing backwards!!

Next: The Right Ventricle This is the largest ventricle As you enter it you pass through the valve. This valve has If you squeeze the heart, this ventricle will feel squishier The _____________ is the muscle that runs up and down in the center of the heart. Where will you go next? tricuspid valve three flaps septum

Now, the Pulmonary Artery As you enter the P.A. you go through the valve. The pulmonary artery is filled with BLUE blood. This blood is low in oxygen and high in ___________________________. Now you will go to the all important organ: _____________. (both the left and right lung) pulmonary carbon dioxide lungs

Particles move from high to low concentration LUNGS You enter the lungs and here you get rid of your and replenished with This happens because of a process called What is diffusion??: __________________________________________ ___________________ surround the air sacs in the lungs and are very thin. They connect the arteries to the veins. carbon dioxide oxygen diffusion Particles move from high to low concentration capillaries

PULMONARY VEINS You come back to the heart through the pulmonary veins (from the left and right lung). This is high in oxygen, the only RED vein you will be in. From here you will enter the _________________________ left atrium

Left Atrium From here you go through a valve called the Then you will be pumped into the ___________ _________. mitral valve left ventricle

it has to pump blood to the whole body and that takes muscle LEFT VENTRICLE This is the smaller ventricle with the . Why so much muscle? most muscle it has to pump blood to the whole body and that takes muscle

Then you go to the so you can be pumped out to the body! See how it comes behind the heart to go downward. This is so it can bring blood to your lower body (like your pinky toe). aorta

THE WHOLE CYCLE: VENA CAVA RIGHT ATRIUM TRICUSPID VALVE RIGHT VENTRICLE PULMONARY VALVE PULMONARY ARTERY LUNGS PULMONARY VEINS LEFT ATRIUM MITRAL VALVE LEFT VENTRICLE AORTIC VALVE AORTA TO THE REST OF THE BODY!!