Lecture 6 - Cardiovascular and Respiratory Systems

Hhmiorgbiointerac7veechocardiogram developing a heart

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Unformatted text preview: ent backflow in veins (a) Vein with one way valves (b) Vein without valves 44 Blood vessels’ anatomy •  Malfunc7on of the valves 45 Blood vessels’ anatomy •  Blockage of arteries – thrombosis •  Atherosclerosis: systemic hypertension can cause damage leading to the forma7on of plaque inside arterial walls which can block the lumen •  Coronary artery disease results from plaque forming in the coronary arteries catering to the heart muscle 46 Blood vessels’ anatomy •  Myocardial infarc7on (MI) or heart alack –  Localized regions of the heart muscle die when the blood supply is cut off –  Dead cardiac muscle does not regenerate –  Cardiac angiography can detect narrowing of coronary vessels –  Balloon angioplasty can widen the lumen of narrowed vessels –  Coronary artery bypasses take a healthy blood vessel and use it to replace a blocked coronary artery 47 Blood vessels’ anatomy •  Angioplasty 48 Pacemaker cells •  For some animals, the rate of the heart is controlled by the brain •  For humans, that’s not the case. Our heart beats without the control of the brain –  The brain can influence the heart beat 49 Pacemaker cells •  Cardiac muscle cells are in electric contact with o...
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