The Circulatory System The Heart

Vocabulary Woo-Hoo! Myocardium Atrium Ventricle Valve Aorta Artery Capillary Vein

What Factors Affect Heart Rate? Make a list of things that might affect how fast your heart beats… Can we test any of them right now? Mini-Lab Write the Question:_________________________________________ Write a Hypothesis: _________________________________________ Experiment! Record Data Results-Make a graph Conclusion-what happened? Were you right?

The Circulatory System The human circulatory system consists of the heart, blood vessels, and blood.

The Heart Your heart is about the size of your fist and is slightly to the left of your sternum. It is made of mostly muscle The heart is enclosed in a sac of tissue called the pericardium The myocardium is a thick layer of muscle that causes the heart to pump. The heart pumps on average 72 times per minute During one year the average person pumps enough blood to fill an Olympic size swimming pool!

Right Atrium—receives deoxygenated blood from the body Valves—like gateways from one chamber to another or the ventricles to the arteries, the valves keep blood from going backwards. Valves keep blood flowing in the right direction. Left Atrium—the upper chamber, receives blood from the lungs and pumps it into the lower chamber. Right Atrium—receives deoxygenated blood from the body Left Ventricle—receives blood from atrium above it, pumps oxygen rich blood into the Aorta and out to the body. Right Ventricle– receives blood from atrium above and pumps blood to the lungs through the pulmonary artery

Color and Label the Heart Diagram Pulmonary Veins Left Atrium Left Ventricle Aortic Valve Mitral Valve Aorta Right Atrium Right Ventricle Pulmonary Artery Superior Vena Cava Inferior Vena Cava

How the Heart Works Animation Video 5 facts!!

Your Heartbeat When the muscle fibers in your atria and ventricles are stimulated (by the Sinoatrial node), the atrial muscles contract followed by the ventricle muscles (the 2 step pattern = lub dub rhythm) Your heart will beat faster or slower depending on your body’s need for exercise (more oxygen=faster and more beats per min)

Blood Vessels Arteries Capillaries Veins As blood flows through the circulatory system it moves through three types of blood vessels—arteries, capillaries, and veins Arteries Large vessels that carry blood from the heart to tissues of the body supplying oxygen Arteries have thick walls to withstand the pressure Capillaries Smallest of the blood vessels Narrow walls, delivers the oxygen and nutrients to the tissues Veins Once the blood has passed through the capillary and no longer has oxygen it goes back to the heart in the vein Once in the heart it can be pumped to the lungs for more oxygen Veins have valves to keep the blood moving to the heart

Circulation Coloring page from the body book

Your heart produces pressure Blood Pressure Your heart produces pressure The force of the blood on the walls of the arteries is known as BLOOD PRESSURE Without pressure, blood would stop flowing

Diseases of the Circulatory System High Blood Pressure Aka Hypertension Heart works harder Can cause heart attack or stroke Atherosclerosis Fatty deposits called plaque build up on the inner walls of the arteries If the artery is blocked, oxygen cannot make its way to the body or the heart=heart attack Valve Problems Can be damaged due to disease or birth defects Causes blood to flow backwards or inefficiently Lack of oxygen to the body

Do you have a Heart Murmur? What is it?

What is a Heart Attack??

Case Study—A look at Long QT Answer the following during the first video Clip- What is the electrical activity of the heart responsible for? Briefly describe what happened to Kevin Oill. How does a defibrillator work? What evidence did the medical team use to diagnose Kevin's Long QT Syndrome? Answer the following during the second video Clip- How was Kevin's disorder treated with technology? What did Dr. Zipes mean by the phrase "umbilical cord attached to medical therapy?" What are pacemakers? How have they evolved? What are the pros and cons of living with a pacemaker?