Biology Unit 1 Revision

This presentation includes information on: Nerves and Hormones, Neurones, Receptors and Reflex Actions, Fertility Hormones, Plant Hormones, Adaptations and Pyramids of Biomass. I hope you like the presentation and find it useful, i drew all the pictures myself ;)

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Nerves and Hormones
The nervous system consists of the brain, spinal cord, neurones and receptors.
Information passes along the neurone to the brain where it coordinates the response which is
carried out by an effector.
The effector is the muscle which responds by contracting muscles or makes glands release
Motor Neurone
Sensory Neurone
Relay Neurone
Neurones are insulated with a myelin sheath, fatty layer, which helps the impulse to pass
more effectively and quicker to the brain.
By Nathan Birtwell

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Receptors and Reflex Actions
Receptors include:
Light- receptors in the eyes
Sound-receptors in the ear
Change of position-receptors in the ears
Taste-receptors in the tongue
Smell-receptors in the nose
Pressure, Pain & Temperature- receptors in the skin
Reflex Actions:
Sometimes, a conscious action is too slow to prevent harm e.g. when touching a hot
Reflex action speeds up the response time by missing out the brain completely.…read more

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Fertility Hormones
Hormones regulate the functions of many organs and cells.
A woman naturally produces hormones that cause:
the monthly cycle of an egg from the ovaries
changes in the thickness of the lining of the womb
Natural Control of Fertility
1. Follicle Stimulating hormone (FSH) is secreted by the pituitary gland. This causes the
egg to mature and the ovaries to produce oestrogen.
2. Oestrogen causes the lining of the uterus to thicken.…read more

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Plant Hormones
Plants are sensitive to light moisture and gravity. The shoots grow towards light; the
roots grow towards moisture and the roots in the direction of gravity and the shoots
Auxins are plant hormones that control the growth of plants in the tips of the
shoots and the roots. When a shoot is exposed to light, more
auxin is produced on the side of the shoot that is in the shade.…read more

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Organisms are adapted to live in certain conditions where they normally live e.g. desert, tundra etc.…read more

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Pyramids of Biomass
The mass of living material (biomass) at each stage of a food chain is less than it was at the
previous stage. The biomass at each stage can be drawn to scale and shown as a pyramid of
-The fox only gets the last bit of energy and biomass that is left. Only a fraction of the sun's
energy is captured by the producer.
-Much of the biomass remains in the root system and is not eaten.…read more


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