A single type of channel will open, permitting simultaneous flow of sodium and potassium. The neuron is responsible for transferring signals to three target cells: And this results in the contraction of muscle, secretion by glands and helps neurons to transmit action potential. C) Spinal reflexes are an example of serial processing. 3.) This series of activations, by propagating the action potential along the fibre with virtually no reduction in amplitude . Outline how a signal is transmitted from a presynaptic cell to a postsynaptic cell at a chemical synapse. (In reference to the neuromuscular synapse, it is called the end-plate potential, or EPP.). A&P 1 Quiz 11 - Subjecto.com - Subjecto.com free essay samples and Chapter 11 Flashcards | Chegg.com Accessibility StatementFor more information contact us atinfo@libretexts.orgor check out our status page at https://status.libretexts.org. B) A single type of channel will open, permitting simultaneous flow of sodium and potassium. Ca2+ is known to be sequestered by certain organelles within the terminal, including the endoplasmic reticulum. 4.) True or False, A stimulus traveling toward a synapse appears to open calcium channels at the presynaptic end, which in turn promotes fusion of synaptic vesicles to the axonal membrane. B) Current is directly proportional to the voltage. the biceps muscle. As the flow of current in a wire occurs at a specific voltage only, similarly the conduction of nerve impulse occurs when a stimulus has a maximum threshold value of -55 millivolts. Vesicle membranes are then recovered from the plasma membrane through endocytosis. Because this hyperpolarization draws the membrane potential farther from the threshold, making it more difficult to generate a nerve impulse, it is called an inhibitory postsynaptic potential (IPSP). The combined effect of sodium inactivation, which blocks the influx of cations, and potassium activation, which causes the efflux of other cations, is the immediate return of the cell membrane to a polarized state, with the inside negative in relation to the outside. The term central nervous system refers to the ________. Saltatory is faster than continuous conduction and occurs in myelinated neurons. c) nerves The resting membrane potential of the nerve cell is -70 mV. b) ganglia Strong stimuli cause the amplitude of action potentials generated to increase. That part of the nervous system that is voluntary and conducts impulses from the CNS to the skeletal muscles is the ________ nervous system. This period occurs at the end of action potential and limits the speed at which nerve impulses can be generated in a nerve fibre. )Area where nerve impulse is generated.2.) membrane exhibits chemically gated ion channels. A stimulus would be you burning your finger or bumping your arm. What generally determines the effects of a neurotransmitter on a postsynaptic cell? The nerve impulse travels at a speed of 100 m/s in saltatory conduction.
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a second nerve impulse cannot be generated until