Communication and Homeostasis 3.0 / 5 based on 1 rating ? BiologyCellular processes and structureA2/A-levelOCR Created by: Fiona BoothCreated on: 12-04-13 15:16 Works to counteracts change and restores original state Negative Feedback 1 of 34 Animals that use external heat to warm their body temperature Ectotherms 2 of 34 Animals that can maintain an internal body temperature by negative feedback Endotherms 3 of 34 Part of the brain that detects body temperature Hypothalamus 4 of 34 A cell that can detect the change in external or internal environments and produce an action potential Sensory Receptor 5 of 34 Transmit nerve impulses from receptor to CNS Sensory Neurone 6 of 34 Transmit nerve impulses from CNS to effector Motor Neurone 7 of 34 Short processes that transmit the impulse from neurone towards body cell Dendrites 8 of 34 Long process that transmits impulse from body cell to effector Axon 9 of 34 Cells that are found wrapped around the axon to insulate it Schwann Cells 10 of 34 Gaps between Schwann cells to which nerve impulses can 'jump' from Nodes of Ranvier 11 of 34 -70mV. The potential of the nerve cell when it is not conducting an impulse. Resting Potential 12 of 34 When Sodium ion channels open and some sodium ions diffuse in the cell Depolarisation 13 of 34 When the depolarisation is large enough to open voltage-gated channels Threshold to fire 14 of 34 Potassium ions diffuse out of the cell. Repolarisation 15 of 34 The resting potential is overshot slightly and reaches -80mv Hyperpolarisation 16 of 34 The time taken for the normal resting potential to be reached after an action potential has been fired. Refractory period 17 of 34 When action potentials jump between Schwann cells to speed up conduction Saltatory Conduction 18 of 34 A chemical that diffuses across the synaptic cleft to transmit a signal Neurotransmitter 19 of 34 A synape that uses acetylcholine as its neurotransmitter Cholinergic 20 of 34 The bulb shaped structure at the end of the presynaptic neurone Synaptic Knob 21 of 34 The enzyme found in the synaptic cleft that will hydrolyse Acetyl Choline Acetylcholinesterase 22 of 34 One product of the hydrolysis of acetyl chloine Ethanoic acid 23 of 34 The other product of the hydrolysis of acetyl choline Choline 24 of 34 The process where many low level signals are amplified at a synapse Summation 25 of 34 When the presynaptic neurone runs out of vesicles after repeated action potentials Acclimatisation 26 of 34 Signals released by the endocrine system. They can be proteins or steroids Hormones 27 of 34 Ductless glands that release hormones straight into the blood Endocrine glands 28 of 34 Glands with ducts Exocrine glands 29 of 34 The enzyme found on the inner surface of a cell membrane that is associated with the adrenaline receptor Adenyl Cyclase 30 of 34 Adenyl cyclase converts AMP into... cAMP 31 of 34 Small sections of the pancreas that have an endocrine function Islets of Langerhan 32 of 34 Cells that secrete glucagon Alpha cells 33 of 34 Cells that secrete insulin Beta cells 34 of 34
Comments
No comments have yet been made