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Keeping Healthy Metabolic Rate
is the rate at
In order to have Cholesterol is which chemical
a healthy diet made in the reactions
you need to eat If you eat too liver and found happen in your
the right much or too in the blood. body.
balance of little of these Your cells need
foods: you can cholesterol, but Metabolic rate
·Carbohydrates become not too much as is dependent
malnourished that can lead to on:
·Fats heart disease. Amount of
·Protein exercise taken.
Proportion of fat
to muscle.
·Vitamins. Inherited
factors.…read more

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·Are even tinier
Diseases than bacteria.
You can
inside living immunity by:
Microorganisms White Blood
cells, damaging ·Being injected
that cause cells help to
them. with small
infectious defend
·Produce toxins amounts of
diseases are against
·Cause; colds, inactive or dead
called pathogens
flu, measles pathogens.
pathogens. by:
and polio ·Your white
Split into · Ingesting
Viruses & pathogens blood cells will
bacteria · Producing Semmelweiss then produce
antitoxins. was a doctor antibodies.
· Producing who recognised ·You have
antibodies. that to prevent acquired
·Are tiny
the spread of immunity
disease doctors because the
should wash white blood
·Produce toxins
there hands. cells remember
·Cause TB,
tetanus &
cholera…read more

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Treating Disease Antibiotic
resistant strains
An epidemic is Some strains of can mutate
Medicines are when;
symptom a local outbreak bacterial
of a disease. A infections can ·Overuse of
relievers not antibiotics
pathogen pandemic is a become
global outbreak resistant due to ·Prescribing
killers. inappropriate
of a disease. natural
selection. antibiotics.
Antibodies kill When this When a
bacterial Antibiotic- happens bacterial
pathogens, but resistant strains antibiotics no infection is
NOT viral occur when longer work. treated; the
pathogens. pathogens
drugs kill
producing a
pathogens but
new strain on
which the
antibiotics have
survive and
no effect
reproduce.…read more

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The Nervous System
The Central Information Receptors
nervous system from receptors detect stimuli
consists of the in your sense such as:
brain and organs pass Light
Spinal Chord. along neurons Sound
to you CNS, Smell
these respond Taste
Effectors are by sending Touch
either muscles information to
of glands: your effectors.
Glands release
Nervous system
Sensory Relay Brain & or Motor
Receptor Neurone Spinal Effectors
Neurone Neurone
Chord…read more

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A synapse works:
Neurones 1. An electrical
impulse travels
Neurones are and reaches the
specially Sensory synapse.
adapted cells Neurones ­ 2. It is converted
that carry Carry impulses into chemicals
electrical from receptor to which diffuse
signals. CNS across.
3. Receptors at the
Motor Relay other side detect
Neurones ­ Neurones ­ the chemicals
Carry signals Carry impulses 4. An electrical
from the CNS from one part of impulse is
to effectors the CNS to generated at
another. neurone B.
Neurons don't
actually touch
each other
there is a tiny
gap between
them called a
synapse.…read more

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Anisa -Team GR

Very useful!

amazing for last min revision! 


This really helped as I am struggling with biology,

Thank you!!

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