B1.2 Nerves and Hormones

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Nervous system
Allows humans to react to their surroundings and coordinates behaviour
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Receptor
Detect external stimuli
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Sense organ
Where receptors are found - the eye, ear, nose, tongue, and skin
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Stimuli
Changes in the environment
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Impulse
The signal that travels along the length of a nerve fiber
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Neurons
Specially adapted cells that carry electrical signals (e.g nerve impulses)
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Central Nerve System (CNS)
Made up of the brain and spinal cord.
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Sensory neuron
Carry impulses from receptors to the CNS
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Motor neuron
Carry impulses from the CNS to effector organs
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Effector organ
Create the response. Either muscles or glands
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Reflex actions
Rapid, automatic responses to a stimulus which protect us from damage
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Synapse
A gap or junction between two neurons
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Reflex arc
The sequence from receptor to effector
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FSH
Follicle stimulating hormone -made by the pituitary gland and causes the egg to mature and oestrogen to be produced
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Pituitary gland
Gland in the brain that produces FSH and LH.
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Oestrogen
Produced by the ovaries, and stops further production of FSH. Stimulates production of LH and the womb lining to develop to receive a fertilised egg
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Ovulation
When the egg is released from the ovary
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Progesterone
Inhibits further production of FSH. Used in contraceptive pills
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Internal environment
The conditions in our body that need to be controlled: water content, ion content, temperature and blood sugar level
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Kidney
Organ which produces urine
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Urine
How we control water and ion content
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Enzyme
A biological catalyst which help the body carry out a reaction.
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Pancreas
Controls our blood sugar level
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Phototropism
The response of plant shoots growing toward light
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Gravitropism/Geotropism
The response of plant roots growing down toward gravity
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Auxin
The hormone that controls phototropism and gravitropism
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Other cards in this set

Card 2

Front

Detect external stimuli

Back

Receptor

Card 3

Front

Where receptors are found - the eye, ear, nose, tongue, and skin

Back

Preview of the back of card 3

Card 4

Front

Changes in the environment

Back

Preview of the back of card 4

Card 5

Front

The signal that travels along the length of a nerve fiber

Back

Preview of the back of card 5
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