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Lecture 15

BIOLOGY 2A03 Lecture 15: 15) Cardiovascular 1
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Department
Biology
Course
BIOLOGY 2A03
Professor
Graham R.Scott
Semester
Winter

Description
15) Cardiovascular 1 Friday, February 10, 2017 1:27 PM 1 Unicellular things don’t have circulatory system Some small multicellular things don’t bc diffusion is sufficient. - Needs for exchange with its environment happen with diffusion. - Diffusion is proportional to the SQUARE of the distance that something has to travel. - Fast convection for moving things around the body quicker than diffusion. 2 Invertebrates have diff circulatory system s but they're doing similar things. - Distribution- getting rid of stuff, moving things around. - Signalling(endocrinology). - Heatdissipation (thermoregulation - get rid of heat from the core of our body). Have a pump (heart) - System of tubes allowing blood to pump away from heart. Operate at higher pressure. - Capillaries. Exchange vessels -mo1ve from inside convective system to cells that need exchange. - Venous system - collecting tubes taking collective medium from capillaries to the organ (heart) so it can continue. 3 Blood, haemolymph in invertebrates - Made of plasmaand cells. - Conserved between individuals. - 55% is plasma , other half are cellular. - Interstitial fluid around cells, plasma has similar composition - ECF = interstitial + plasma Plasma has proteins, nutrients, hormones ,etc. Conserved between individuals. - - 55% is plasma , other half are cellular. - Interstitial fluid around cells, plasma has similar composition - ECF = interstitial + plasma - Plasma has proteins, nutrients, hormones ,etc. Erythrocytes- RBC-45% - Contain haemoglobin to carry oxygen AND c02 - Contain carbonic anhydrase. Haematocrit -proportion of blood composed of red blood cells 4 Out circulatory system Two main circuits 1. Pulmonary -blood from heart to lungs (gas exchange) - Picks up oxygen - Operates at low blood pressure . - From right ventricle through pulmonary arteries to capillaries, then travels back to left side of heart**** 2. Systemic- after return from heart to lungs, pumps it out to systemic tissues - Highpressure. - Left ventricle to systemic tissues, then blood goes iv ne nous circulation to the right heart so it can all continue again. Both circuits have an arterial side- take blood away from heart - higher pressure Venous - vein -take blood TO theh eart. Flow through each circuit has to be equal - 5L per minute(cardiac output). Artery away bc starts with a Veins TO the heart Deoxygenated or oxygenated depending where its coming from. 5 Blood can be directed to diff places Veins TO the heart Deoxygenated or oxygenated depending where its coming from. 5 Blood can be directed to diff places - Flowsin series from the lungs to systemic circulation. - When it leaves the left heart it flows in parallelto all capillary beds. - Leaves left heart and goes through one capillary bed in a certain tissue, then goes back to right side of heart. - Doesn’tgo through multiple tissue beds before it returns to the heart. Portal system - goes from two diff tissue types or capillary beds (ie gastro to liver) - exception. Heart has its own capillary bed. - Own circulation from the coronary artery. 6 - Maintaining blood flow to the heart Is key. - Problems cause heart attack. - Coronary artery to heart is blocked from plaque or blood clot - Isnt enough blood, tissue becomes oxygen limitted and is a major cause of heart attack. - Often, due to build up of plaque. 7 Anatomy Heart has right and left side. Right side is shown on the left to us- perspective is looking down at an individual. Two atria, two ventricles Right heart has right atria which receives blood from systemic nervous system Blood goes through atrioventricular value. Then enters right ventricle which pumps the blood into the pulmonary artery. Right hea
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