Homeostasis key terms

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Temporal summation
Frequent small EPSPs gradually build on each other to achieve threshold potential in second neurone
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Cell metabolism
Result of all chemical reactions taking place in the cytoplasm
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Sensory receptors
Transducers - convert energy of stimulus into electrical energy (nerve impulse)
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First messenger
Hormone that transmits a signal around the body
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Local current
Movement of ions along the neurone. Flow of ions caused by an increase in concentration at one point which causes diffusion away from the region of higher concentration
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Action potential
Depolarisation of the cell membrane so that the inside is more positive than the outside with a potential difference across the membrane of +40mV. This can be transmitted along the axon or dendron plasma membrane.
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Oxytocin
Increases uterine contractions which stretch the cervix - just before child birth.
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Cardiovascular centre
Specific region of medulla oblongata that received sensory inputs about levels of physical activity, blood CO2 concentration & blood pressure. Sends nerve impulses to SAN in heart to alter frequency of excitation waves.
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Polarisation
Potential difference across membrane - this is the resting potential.
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Physiology
Way in which living organism or bodily part functions
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Pancreatic duct
Tube that collects all secretions from exocrine cells in the pancreas & carries fluid to small intestine
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Hormonal system
Transported in the blood cells in endocrine organ release signal only recognised by specific target cells - this is a long term response
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Threshold potential
Potential difference across the membrane of about -50mV. If the depolarisation of the membrane reaches the potnetial threshold then action potential created.
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Hormones
Molecules released by endocrine glands directly into the blood. Messengers carrying signal from endocrine gland to a specific target organ or tissue.
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Communication system
Stimulus - receptor - cell signalling - effector - response
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Acetylcholinesterase
Enzyme in the synaptic cleft that breaks down acetylcholine into ethanoic acid & choline
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Target cells
Possess specific receptors on CSM - shape of receptor complementary to shape of hormone molecule
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Spatial summation
Small EPSPs resulting from many active synapses building on each other to achieve threshold potential in second neurone
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Card 2

Front

Result of all chemical reactions taking place in the cytoplasm

Back

Cell metabolism

Card 3

Front

Transducers - convert energy of stimulus into electrical energy (nerve impulse)

Back

Preview of the back of card 3

Card 4

Front

Hormone that transmits a signal around the body

Back

Preview of the back of card 4

Card 5

Front

Movement of ions along the neurone. Flow of ions caused by an increase in concentration at one point which causes diffusion away from the region of higher concentration

Back

Preview of the back of card 5
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