Campbell Biology
12th Edition
ISBN: 9780135188743
Author: Urry
Publisher: PEARSON
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Chapter 48.3, Problem 4CC
WHAT IF? → Suppose a mutation caused gated sodium Channels to remain inactivated longer after an action potential. How would this affect the frequency at which action potentials could be generated? Explain.
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In terms of Na and K ion gradient /movement - what causes the action potential (positive
charge peak) inside the cell membrane?
- What are the approximate Na and K concentration changes (mMoles) during /after the action
potential and what is the directional move of each ion in relation to the cell membrane?
- What is the duration of an action potential ? or....over what period of time does the peak rise and
fall ? - use proper units.
Please ASAP. Thank you
What is the effect of membrane potentials on the movement of ions across a cell? use the following Nernst potential values:Sodium=+67mV; Potassium=-98mV; Calcium=+129mV; and chloride=-90mV
Please ASAP. Thank you.
Cyclic nucleotide gated channels (CNG ): Is this channel voltage sensitive? How is this channel gated?
Chapter 48 Solutions
Campbell Biology
Ch. 48.1 - Prob. 1CCCh. 48.1 - Describe the basic pathway of information flow...Ch. 48.1 - WHAT IF? How might increased branching of an axon...Ch. 48.2 - Under what circumstances could ions flow through...Ch. 48.2 - WHAT IF? Suppose a cell's membrane potential...Ch. 48.2 - MAKE CONNECTiONS Review Figure 7.10, which...Ch. 48.3 - How do action potentials and graded potentials...Ch. 48.3 - In multiple sclerosis (from the Greek skleros,...Ch. 48.3 - How do both negative and positive feedback...Ch. 48.3 - WHAT IF? Suppose a mutation caused gated sodium...
Ch. 48.4 - Prob. 1CCCh. 48.4 - Some pesticides inhibit acetylcholinesterase, the...Ch. 48.4 - Prob. 3CCCh. 48 - How would severing an axon affect the flow of...Ch. 48 - Suppose you placed an isolated neuron in a...Ch. 48 - Prob. 48.3CRCh. 48 - Prob. 48.4CRCh. 48 - Level 1: Knowledge/Comprehension 1. What happens...Ch. 48 - Level 1: Knowledge/Comprehension 1. What happens...Ch. 48 - Where are neurotransmitter receptors located? (A)...Ch. 48 - Why are action potentials usually conducted in one...Ch. 48 - Which of the following is the most direct result...Ch. 48 - Suppose a particular neurotransmitter causes an...Ch. 48 - WHAT IF? Ouabain, a plant substance used in some...Ch. 48 - Prob. 8TYUCh. 48 - DRAW IT Suppose a researcher inserts a pair of...Ch. 48 - EVOLUTION CONNECTION An action potential is an...Ch. 48 - Prob. 11TYUCh. 48 - WRITE ABOUT A THEME: ORGANIZATION In a short essay...Ch. 48 - Prob. 13TYU
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, biology and related others by exploring similar questions and additional content below.Similar questions
- Short FRQ The figure below illustrates a generic model of neurotransmitter secretion and reception across a synapse. receptor axon- vesicle presynaptic neuron B synaptic space Respond in complete sentences. postsynaptic neuron A model of chemical signaling across a synapse. (b) Explain the direction of the nerve impulse. nerve impulse (a) Describe the structure of the neuron synapse using proper vocabulary. transporter -neuro transmitter -dendritearrow_forwardPlease ASAP. Thank you. How is KA channel activated? What is role of this channel in the action potential?arrow_forwardWHAT IF? Suppose a mutation caused gated sodiumchannels to remain inactivated longer after an actionpotential. How would this affect the frequency at whichaction potentials could be generated? Explain.arrow_forward
- Please ASAP. Thanku If one increases the intracellular concentration of Na+ around a neuron, what would happen to the resting membrane potential? Ion Extracellular Concentration (mM) Intracellular Concentration (mM) Na+ 440 50 K+ 20 400 Cl- 560 52 Ca++ 10 1 I am not sure No effect Becomes more positive Less positivearrow_forwardSeparately, draw a table using arrows to depict the appropriate magnitude and direction of the forces and ion fluxes at different membrane potentials for a ligand-gated channel that is equally permeable to both ion X+ and ion Y+. The equilibrium potential for ion X+ is -60 mV, and the equilibrium potential for ion Y+ is -20 mV. Which item best represents the forces and fluxes for a membrane potential of +40 mV?arrow_forwardSeparately, draw a table using arrows to depict the appropriate magnitude and direction of the forces and ion fluxes at different membrane potentials for a ligand-gated channel that is equally permeable to both ion X+ and ion Y+. The equilibrium potential for ion X+ is -60 mV, and the equilibrium potential for ion Y+ is -20 mV. Which item best represents the forces and fluxes for a membrane potential of -60 mV? Pick one of the four tables in the included image please for your answer.arrow_forward
- explain action potential. and what is a resting membrane potential?arrow_forward#Differentiate between membrane potential & action potential. In which cells action potentials generate & why this cells have to generate action potentials. Please discuss in briefly. Word limit (600-700)arrow_forwardPlease explain what the resting membrane potential is and its value. Make sure you include all structures involved in the creation and maintenance of the resting membrane potential. Explanation addressing the question above Membrane potential is the difference in electric potential between the interior and the exterior of a biological cell. With respect to the exterior of the cell, typical values of membrane potential range from -40 mV to -80 mV. The membrane potential has two basic functions as a battery and transmitting signals between different parts of a cell. In non-excitable cells, the membrane potential is held at a relatively stable value, called the resting potential. The resting membrane potential of a neuron is about -70 mV. At rest, there are relatively more sodium ions outside the neuron and more potassium ions inside that neuron. It is determined by concentration gradients of ions across the membrane and by membrane permeability to each type of ion. Structure and…arrow_forward
- Part C-Comparing and Contrasting the Two Types of Voltage-Gated lon Channels Sort the phrases into the appropriate bins depending on whether they describe similarities or differences between voltage-gated K* channels and voltage-gated Na+ channels. > View Available Hint(s) Reset Help The polarity of the substances they transport across the membrane The direction of ion movement The stimulus that triggers opening through the channel The placement of the channel protein relative to the membrane The inactivation mechanism Similarities Differencesarrow_forwardPlease ASAP. Thank you. A hypothetical neuronal cell shows the following intracellular and extracellular concentration of sodium, potassium, calcium, and chloride ions. Extracellular concentration (mM) Intracellular concentration (mM) (Ion)out/ (Ion)inside E ion at 37 oC Sodium ion 420 60 Potassium ion 25 420 Calcium ion 16 0.4 Chloride 565 45 How does increase in the extracellular potassium concentration to 250 mM affect the Nernst potential? Why?arrow_forwardvoltmeter microelectrode electrode Giant squid axon A voltmeter was used to measure the potential difference across the cell membrane of a giant squid axon. Which of the following best explains the voltmeter reading? Select one: a. The threshold potential has not been reached. b. The sodium potassium exchange pumps are working to take out the sodium ions and bring in the potassium ions. c. The potassium ions have rushed out of the axon, and the potassium channels are slow to shut down. d. The sodium ions have rushed into the axon, and the sodium channels are closing.arrow_forward
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