Why do we need elasticity? – to compensate for high pressure (when ventricle contract- blood rush out and create a high pressure) What is the function of artery? –blood away fro heart when heart contract. what happen to the blood when heart contract? – rush out the artery. What (environment) does it create? – high pressure so why do we need elastic wall?
Arteriosclerosis can affect ANY artery in the body (ex. Artery to heart, brain, arm, leg…)
Blood circulation to heart cells to deliver oxygen to these heart muscle cells.
Platelet (what happen during injury…) Completely BLOCK the blood flow to the heart muscle cells If no oxygen to these cells, the cells will be damaged or die. 2 ways blood flow is blocked – blood clot, build up of plaque
Cardiac arrest= heart stops beating when blood stops flowing blood to brain or vital organs. Heart attack – stopped blood flow to HEART A heart attack is when blood flow to the heart is blocked, and sudden cardiac arrest is when the heart malfunctions and suddenly stops beating unexpectedly. A heart attack is a “circulation” problem and sudden cardiac arrest is an “electrical” problem.
Hardening of artery and increased blood pressure causes heart to pump harder thickening the wall of ventricles (more muscle cells) less flexible (pic; muscular ppl move less flexible) & more FORCE when heart is pumping increase more pressure.
Bypass surgery; taking healthy blood vessel from another part of body -> use it to take blood around the narrow/clotted part of artery *BYPASS
To prop the blood vessel open
Abnormal heart rhythm Problem with electrical activity can lead to cardiac arrest
Cardiogram of Normal vs. abnormal heart sounds -could due to defect in any one of the 4 valves
Ms. He's Circulatory Disease
Cardiovascular Diseases• Atherosclerosis leading to: – Coronary Artery Disease – Heart attack – Stroke – Hypertension• Arrhythmias• Heart Murmurs
Introduction to Atherosclerosishttp://www.youtube.com/watch?v=M0NF2ODfd9Ehttp://www.youtube.com/watch?v=1TAFuOGXem8&feature=fvwrel
Atherosclerosis• Thickening of artery wall due to buildup of plaque in the wall• Plaque is mainly made up of fat, cholesterol, blood clotting materials What is the function of Artery?
Formation of Plaque• At the site of tear in artery wall
Atherosclerosis: Hardening of Artery• Plaque limits the elasticity of the artery wall Why is it important for artery to have elastic wall? What happens when artery loss its elasticity?• Narrow artery• Higher the arterial pressure -> causes hypertension
Arteriosclerosis-Related Diseases• Coronary Artery Disease Affected artery that supply blood to heart• Heart Attack• Stroke Affecrtery that supply blood to brain
Coronary Artery• Artery around the heart• Coronary arteries transport blood from heart TO heart muscle cells Why is it important to circulate blood to heart cells through coronary artery?
Atherosclerosis: Heart Attack • Rupture of plaque result in blood clot Which blood cell is responsible for blood clot? Blood Clot • Heart attack is the result of blockedBuildup of Plaque blood flow in coronary artery • Lack of oxygen flow to heart muscle cells What will happen to the heart muscle cells?
Heart Attack What type blood is transported through coronary artery? • Death of cardiac muscle cells due to lack of oxygen • Heart may stop pumping
Stroke• “Brain attack”• Lack of oxygen flow to brain• Blocked or bursted arteries that transport blood to brain
Types of Atherosclerosis Affected Artery Blood flowCoronary Artery Disease Coronary Artery ReducedHeart Attack Coronary Artery BlockedStroke Artery that transfer blood Blocked to brain
Hypertension • Prolonged high blood pressure • Often due to narrowing of arteries from plaque buildup • Heart is constantly pumping harder • Overuse leads to thickening of heart muscles making them less flexible and more inefficient at pumping