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c) nerves d) ions always move from an area of higher concentration to an area of lower concentration, sodium gates in the membrane can open in response to electrical potential changes, Bipolar neurons are commonly ________. B) A single type of channel will open, permitting simultaneous flow of sodium and potassium. In addition, only a single synapse is involved at these sites, whereas a single neuron of the central nervous system may have many synapses with many other neurons, each with a different neurotransmitter. Also called a nerve impulse transmitted by ions Action Potential During this; an exceptionally strong stimulus can trigger a response Relative Refractory Period Numerous nerve impulses arriving at a synapse at closely time intervals exert a cumulative effect during this period Temporal Summation
A second nerve impulse cannot be generated until when? a) Schwann cell Postsynaptic membrane. Name any four of them.. This transmission of a nerve impulse across the neuron membrane as a result of a change in membrane potential is known as Nerve impulse conduction. B) stimulate the production of acetylcholine, C) destroy ACh a brief period after its release by the axon endings. serotonin C) nitric oxide D) endorphin, A neuron that has as its primary function the job of connecting other The sodium and potassium ATPase pump, driven by using ATP, helps to restore the resting membrane state for the conduction of a second nerve impulse in response to the other stimulus. Signup as a free member below and you'll be brought back to this page to try the sample materials before you buy. It is a change in the resting state of the neuron. A) the myelin sheath b) amplify or enhance the effect of ACh This leaves 0.30 to 3.80 milliseconds for other processes. Which of the following will occur when an excitatory postsynaptic The resting membrane potential of the nerve cell is -70 mV. Ion channel. Relative refractory period An exceptionally strong stimulus can trigger a response Repolarization The specific period during which potassium ions diffuse out of the neuron due to a change in membrane permeability. Saltatory is faster than continuous conduction and occurs in myelinated neurons. )Which neuron is a sensory neuron found in a reflex arc? central processes. Select the correct statement about serial processing. Neurons are a complex network of fibers that transmit information from the axon ending of one neuron to the dendrite of another neuron. A When one or more presynaptic neurons fire in rapid order it produces a much greater depolarization of the postsynaptic membrane than would result from a single EPSP; this event is called ________ summation. A neuronal circuit that concentrates or directs a large number of incoming impulses to a rather small number of neurons is called a(n) ________. . repolarization occurs with the flow of K+ out of the cell. are called ________. Due to the difference in the concentration of ions inside and outside the membrane, a potential gradient is established ranging between -20-200mV ( in the case of humans, the potential gradient in the polarized state is nearly -70mV). A second nerve impulse cannot be generated until ________. are crucial for the development of neural connections.
Anatomy Test #3d Flashcards the membrane potential has been reestablished. The resting membrane potential refers to the non-excited state of the nerve cell at rest when no nerve impulse is being conducted. If a motor neuron in the body were stimulated by an electrode placed about midpoint along the length of the axon ________. a) sodium gates in the membrane can open in response to electrical potential changes No problem. This Myelin sheath has regular gaps, where it is not present, called nodes of Ranvier. Not ready to purchase the revision kit yet? some types of Na+ channels inactivate at a positive potential and summationD) Threshold stimulus, The nodes of Ranvier are found only on myelinated, peripheral neuron processes. The role of acetylcholinesterase is to ________. However, the velocity of conduction along the nerve fibre is dependent upon several factors. That part of the nervous system that is voluntary and conducts impulses from the CNS to the skeletal muscles is the ________ nervous system. Does Berkekey accept transcripts with a W on it. a) motor fibers that conduct nerve impulses from the CNS to smooth muscle, cardiac muscle, and glands This problem has been solved! The nodes of Ranvier are packed with a high concentration of ion channels, which, upon stimulation, propagate the nerve impulse to the next node. Any distraction in this process can have drastic effects on the body. Repolarization A gap between Schwann cells in the peripheral system is called a(n) ________. In myelinated neurons, myelinated sheaths are present. 4.) A second nerve impulse cannot be generated until: the refractory period: In what way does the interior surface of a cell membrane of a resting (nonconducting) neuron differ from the external environment? Na+ channels open: . d) motor fibers that conduct nerve impulses from the CNS to skeletal muscles, motor fibers that conduct nerve impulses from the CNS to smooth muscle, cardiac muscle, and glands, Saltatory conduction is made possible by ________. Study now. negatively charged and contains less sodium. Opening K+ or Cl- channels in a postsynaptic In contrast, the concentration of potassium ions is 25 times more inside the axon than outside. When a neuron is not actively transmitting a nerve impulse, it is in a resting state, ready to transmit a nerve impulse. Tightly controlling membrane resting potential is critical for the transmission of nerve impulses. A) are crucial for the development of neural connections. The rate of transmission and generation of nerve impulses depends upon the type of cell. Strong stimuli cause the amplitude of action potentials generated to increase. Subthreshold Stimulus An insufficient stimulus Spatial Summation It is a static state and both the sodium and potassium channels are closed during this state maintaining a high concentration of sodium ions outside and high potassium ions concentration inside the cell. The signal is transmitted in the form of ions and therefore it is much faster than chemical synapses. c) neurolemma An action potential, also called a nerve impulse, is an electrical charge that travels along the membrane of a neuron. postsynaptic neuron by many terminals at the same time.3.) What does the central nervous system use to determine the strength of a stimulus? after-discharge circuitD) Converging circuit, Cell bodies of sensory neurons may be located in ganglia lying b) Schwann cells Axon terminals release neurotransmitters. A) the membrane potential has been reestablished B) the Na ions have been pumped back into the cell C) proteins have been resynthesized D) all sodium gates are closed.
Free Flashcards about A&P CH-11 - StudyStack True or False, A synapse formed between the axon ending of one neuron and the cell body of another neuron is called an axosomatic synapse. It is a short duration of time during which a new nerve impulse cannot be generated in a neuron, after initiation of a previous action potential. The answer is 'the membrane potential has been reestablished' Ths occurs by pumping out sodium ions from the inside of the cell. { "11.1:_Case_Study:__The_Control_Center_of_Your_Body" : "property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass228_0.
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(c) Find the minimum product of sums. Stimulation of a In the polarized state, the axon membrane is more permeable to potassium ions instead of sodium ions and as a result, it causes rapid diffusion of potassium ions. farther and farther along the circuit. Neurophysiology Practice #2 - A second nerve impulse cannot be It refers to a graded potential state because a threshold stimulus of about -55mV causes a change in the membrane potential. B) large nerve fibers interior is ________.A) negatively charged and contains less sodium, B) positively charged and contains less sodium, C) negatively charged and contains more sodium, D) positively charged and contains more sodium, If a motor neuron in the body were stimulated by an electrode placed membrane exhibits chemically gated ion channels. the interior is _____. spinal cord? 4.) KNR 181 Ch 11 Study Guide Flashcards | Chegg.com