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Biology 1A




Nervous system

You have five sense organs:

Eyes
Ears
Nose
Tongue
Skin

They all contain receptors. (Receptors a sensitive to stimulus)they change stimulus energy e.g light
energy into electrical impulses.

A stimulus can be

Light
Sound
Touch
Pressure
Pain
Chemical
Change in position
Or temperature

The central nervous…

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Biology 1A




Hormones are chemical released directly in blood by only affect particular cells called target cells.
Hormones control things in the organ and cells. Hormones travel at the speed of blood. Also has long
lasting effects.

Hormones are chemical messages which travel in blood to activate target cells

Nerves…

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Biology 1A




Advantage

99% effective at stop getting pregnant
Reduce risks of getting cancer
Disadvantage

Disadvantage

Isn't 100% effective
Has side effect
Don't protect against STI's



FSH can be taken by women who have that have Low FSH to stimulate the egg protection in the
ovaries

Advantage

Help people to…

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Biology 1A




Water is lost through sweat breathing urine. On a cold day you not exercising you don't sweat the
urine is dilute. On a hot day when you are exercising you sweat a lot so the urine will be
concentrated.

Body temperature, the brain act like a thermostat, it's…

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Biology 1A




Surveys can be done however it still depends on how you collect your data

Cholesterol and Salt

High cholesterol level increase risk problems because the blood vessels get clogged up with fatty
cholesterol deposits which cause heart problems

The liver control the amount of cholesterol and makes and…

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Biology 1A




People use drugs because of the users background or personal life which influence them choosing to
use drugs

Cannabis is a stepping stone-the effect of cannabis creates a desire to try harder drugs
Cannabis is a gateway-cannabis use brings people into contact with drug dealers
Down to genetics-certain…

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Biology 1A




But antibodies actually kill the bacteria except viruses because they are made from your own blood
cells

Bacteria can come resistant to antibiotic as the antibiotics don't manage to kill all bacteria therefore
allowing the others to evolve to become resistant this is natural selection.

Treating disease

Semmelweiss…

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