The Circulation System

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Jenny Dove
Flashcards by Jenny Dove, updated more than 1 year ago
Jenny Dove
Created by Jenny Dove over 7 years ago
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THE CIRCULATION SYSTEM; * CIRCULATION SYSTEM CONSISTS OF THE BLOOD, ARTERIES , CAPILLARIES AND THE HEART.
THE BLOOD; * PEOPLE HAVE 4 - 5L OF BLOOD; * 50% BLOOD IS PLASMA; (pale liquid of 95% water // 3 TYPES) * PLASMA CONSISTS OF- glucose,amino acid,wastes,hormones and CO2.
Plasma #1 - RED BLOOD CELL; * MOST NUMEROUS = RED COLOUR * RED CHEMICIAL = HAEMOGOBLIN = O2 * DIS-SHAPED + THICK AT EDGES
Plasma #2 - WHITE BLOOD CELL; * NOT MUCH OF THESE; * NO SHAPE; * PROTECT BODY AGAINST DISEASE.
Plasma #3 - PLATELETS; * TINY FRAGMENT CELLS; * CAUSE BLOOD TO CLOT.
FUNCTIONS OF BLOOD #1 TRANSPORT; * transport substances around the body. * living cells need; food molecules, O2 , hormones.
FUNCTIONS OF BLOOD #2 DEFENCE AGAINST DISEASE; * white blood cells engulf bacteria and make antibodies to kill them.
BLOOD VESSELS; * 3 TYPES; * ARTERIES * VEINS * CAPILLARIES
ARTERIES; * Thick walls, * Narrow lumen, * No valves, * Carry blood AWAY from the heart.
VEINS; * Thin walls, * Wide lumen, valves, * Carry blood TO THE heart.
CAPILLARIES; * Link arteries to veins, * Wall is only one cell thick allows substances in & out of Blood.
THE HEART; * Made of of cardiac muscle - never tires, * 4 chambers
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