the circulation system A simple, unicellular organism (consisting of 1
cell) can rely on diffusion to move substances into
and out of the cell.
Most multicellular organisms have too small
surface area, so diffusion is too slow to provide
the necessary molecules. So, they require a system
to transport nutrients and waste products around
the organism.
CHD (Coronary Heart Disease) CVD (CardioVascular Disease)
when your heart's blood supply is blocked by a a plaque of cholesterol is built up in other vessels.
build-up of fatty substances in the coronary arteries.
CAUSES HEART ATTACK CAUSES HEART ATTACK AND ANGINA
ATHEROSCLEROSIS
Over time, the walls of your arteries can become furred up with fatty deposits (atheroma)
STEPS (for both) FACTORS (for both)
1. Fatty cholesterol plaques develop over time - smoke
2. Hard outer layer of plaque can crack - high blood pressure (hypertension)
3. Platelets form blood clots around the cracks - high cholesterol
4. Artery narrows even more - have high levels of lipoprotein
5. Blood flow blocked (oxygen doesn’t reach the - do not exercise regularly
heart muscle, so the muscle dies) - have diabetes (be obese)
cell) can rely on diffusion to move substances into
and out of the cell.
Most multicellular organisms have too small
surface area, so diffusion is too slow to provide
the necessary molecules. So, they require a system
to transport nutrients and waste products around
the organism.
CHD (Coronary Heart Disease) CVD (CardioVascular Disease)
when your heart's blood supply is blocked by a a plaque of cholesterol is built up in other vessels.
build-up of fatty substances in the coronary arteries.
CAUSES HEART ATTACK CAUSES HEART ATTACK AND ANGINA
ATHEROSCLEROSIS
Over time, the walls of your arteries can become furred up with fatty deposits (atheroma)
STEPS (for both) FACTORS (for both)
1. Fatty cholesterol plaques develop over time - smoke
2. Hard outer layer of plaque can crack - high blood pressure (hypertension)
3. Platelets form blood clots around the cracks - high cholesterol
4. Artery narrows even more - have high levels of lipoprotein
5. Blood flow blocked (oxygen doesn’t reach the - do not exercise regularly
heart muscle, so the muscle dies) - have diabetes (be obese)
