Biology Revision Notes

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Biology End of Year Revision

Quick Recap on Graphs: * Always remember to include units * Put the dependent (thing you measure) along the y-axis. (One going up) * Put the independent (thing you change) on the x-axis (along the bottom) * Don’t join the dots up, draw a line of best fit. * Circle anomaly result.

Healthy Diet
For a healthy diet, you need energy. So you need:
CARBOHYDRATES, to release energy.
FATS, to keep warm and release energy
PROTEIN, for growth cell repair and cell replacement.
FIBRE, to keep everything moving smoothly through your digestive system.
VITAMINS and MINERALS in small amounts, to keep your skin, bones blood and everything healthy.

You need energy to fuel the chemical reactions in the body that keep you alive. These reactions are called your METABOLISM. And the speed at which they occur is called your METABOLIC RATE.

Different people have different resting metabolic rates. Eg, muscle need more energy than fatty tissue so people with a higher proportion of muscle to fat will have a HIGHER metabolic rate.

Physically bigger people also will have a higher metabolic rate because their bodies need more energy.
Men tend to have a higher metabolic rate than women-because they’re bigger and have a larger proportion of muscle. Regular exercise can boost your metabolic rate because it builds muscle.

People whose diet is badly unbalanced are said to be MALONOURISHED. This can be too FAT or too THIN. Eating too much can lead to obesity: * Excess carbs or fat in the diet can lead to being overweight. * Obesity is being over 20%of your maximum recommended body mass. * Usual cause is bad diet, over-eating and lack of excersise. * Health problems can arrive such as ARTHIRITUS,TYPE 2 DIABETES,HIGH BLOOD PRESSURE and HEART DISEASE.

Inherited factors- your health can depend on inherited factors too. Some people may inherit factors that effect their metabolic rate e.g. Causing underactive

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