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.
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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Other cards in this set
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
Card 4
Front
Hormone that transmits a signal around the body
Back
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
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