Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN: 9780134580999
Author: Elaine N. Marieb, Katja N. Hoehn
Publisher: PEARSON
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Introduction
the length constant (λ) is a mathematical constant used to quantify the distance that a graded electric potential will travel along a neurite via passive electrical conduction
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- Nervous Tissue electrical and chemical disequilibrium across cell membranes equilibrium potential calculating the equilibrium potential using the Nernst Equation The parameters of the Goldman Equation the reason for a -70mV resting'potential in most excitable cells gated channels particulars Defining depolarization, repolarization and hyperpolarization defining the role for the common ions, (K+, Na+ )special ions Cl, Ca+ have Define Current and ohm's law l=V/R Defining graded potentials and particulars about graded potentials such as subthreshold GP o suprathreshold GP temporal summation spatial summation e1 of 2 418 words English (United States) O Focus B I @ #3 24 & * 3 4 7 8arrow_forwardIf the resistance of the neuronal membrane goes from 250 Mᘯ to 500 Mᘯ, which of the following is most likely to occur? Current will doble Current will quadruple Current will decrease by half Current will increase by 1/4tharrow_forwardName the 7 structures of the conductive zone. What is their role?arrow_forward
- Fill in the diagram, your illustration should demonstrate for each phase of the AP: 1. The relative concentration of K and Na 2. The relative voltage across the membrane 3. Any movement across the membrane of K and NA 4. The three kinds of channels in the membrane, and their state (open or closed) 5. Finally, indicate on the graph of the AP which phases correspond to hyper- polarization and which phases correspond to de- polarization Outside Outside Inside Inside Outside Inside Outside 1 Outside Inside Insidearrow_forwardWhat is the term used to describe the state of an axon in the later phase of an action potential during which an increase in current is required to produce another action potential? partially inhibited refractory relatively refractory disequilibriated refractory relatively disinhibited refractoryarrow_forwardDefine depolarization, repolarization, and hyperpolarization in terms of how it affects the membrane potential of an excitable cell.arrow_forward
- Which type and speed of slow axonal transport moves distinct polypeptides to the neuronal periphery? SCa 0.1 to 1mm/day SCa 1 to 3mm/day SCb 1 to 3mm/day SCc 0.1 to 100mm/dayarrow_forwardAn action potential travels down a neuron: O From dendrite to axon terminals Moves even faster because of the Nodes of Ranvier Involve Sodium Potassium Pumps All of the abovearrow_forwardDuring depolarization, the membrane potential: doesn't change becomes more negative. becomes less negative.arrow_forward
- How does Ohm’s law explain the passive moment of current down an axon?arrow_forwardDescribe what would happen to the action potential if we blocked the Calcium channels in caridac myocytes, and the effect it would have on the heart.arrow_forwardWhat becomes active during a sag in neuron which is an indication of hyperpolarisation activated cation current?arrow_forward
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