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Skeletal systems
Organ systems are make of organs. Organs are make out of tissue. Tissue are made out of same type of
cells
The skeletal system of plants and animals are organs system ( bone are living organs).
Some bone (e.
g., skull) are for
protection
Some bones (e.g. The stem holds the plant up
backbone are for straight. Some stems have
support spines or thick covering for
protection
Some bones allow
movement at
joints
The roots anchor the plant…read more

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Movement
Muscles cannot push, they can only pull. So, they are found in antagonistic pairs.
One muscle in the pair can contract (get shorter and fatter) to pull the bone in one direction
and the other muscle in the pair can relax the bone the other way.…read more

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Animal sensitivity
Many animals have obvious sense organs. When light strikes the retina at the back of your
eye, electric impulses are sent to he brain to allow you to see. When sound waves reach
the cochlea in the ear, impulses are sent to the brain to allow you to hear.
Your nervous system allows you to respond to the stimuli that your sense organs detect.
Sometimes the response is a hormone being released into your blood. Responses to
stimuli hep organisms to survive.
Electrical impulses are sent from sense organs along neurons to your brain. Your brain
then sends impulses to other parts of your body to make you react…read more

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Plant sensitivity
Plants, like animals, can detect and respond to environmental factors, such as light and temperature. For
instance, plants always grow towards the light to help them get enough light for photosynthesis.
Chloroplasts detect light.
nucleus
Chloroplasts are green Vacuole contains cell sap and
discs that contain acts as a store of nutrients for the
chlorophyll. They make food plant cell, as will as helping to
for the plant using support it
photosynthesis
Cell surface membrane Cytoplasm
Cell wall…read more

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Internal factors
As well as detecting changes around them, animals and plants also detect changes occurring inside
them. White blood cells are found in your blood, and some detect microbes that enter your body. They
then help to destroy tem, often by creating antibodies. An immunisation causes white blood cells to create
antibodies against a particular disease so that you don't get it.
White blood cells are part of your body's natural defences, which include ciliated epithelial cells in the
trachea, tears in your eyes and acid in your stomach.
The white blood cell detects the microbe and starts to make antibodies.
The antibodies are made specially to fit onto the outside of the microbe. Each type of microbe has a
different surface and so needs a different type of antibody…read more

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