BIOLOGY(LL)-W/ACCESS CODE >CUSTOM<
12th Edition
ISBN: 9781264058167
Author: Raven
Publisher: MCG CUSTOM
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Chapter 42, Problem 2DA
Summary Introduction
To determine: The overall effect when the cell body receives input from two neurons at the same time that generates two potential.
Introduction: The neurotransmitters are found in the nervous system; these are either excitatory or inhibitory in nature. Excitatory neurotransmitters act to stimulate potential by producing the EPSP (Excitatory postsynaptic potential). The inhibitory postsynaptic potential is produced by inhibitory neurotransmitters (IPSP)
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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.
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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
Differences
TUNOWIng table comparing the Na+ Channel AND the Na+K+ ATPase.
Na K+ ATPase
Voltage-Gated
Nat Channel
XION
Which ion or ions are transported?
This transporter requires ATP? (Y or N)
This protein is allosteric? (Y or N)
Active Transport or Passive Transport?
Polarizes axon or Depolarizes axon?
X
ions
·NO X
yes
Passive Xtransport active Xtransport
Polarizes axoni Depolarizes akon
X yes.
activges
(1) Ton)
(9)
From the image provided. Do you think that a membrane potential exists for this synthetic plasma membrane? If your answer is “yes,” please indicate whether it is negative or positive at the region closer to the inner leaflet of the plasma membrane. Explain your reasoning.
Chapter 42 Solutions
BIOLOGY(LL)-W/ACCESS CODE >CUSTOM<
Ch. 42.1 - Differentiate between subdivisions of the...Ch. 42.1 - Prob. 2LOCh. 42.1 - Explain the roles of the different nervous system...Ch. 42.2 - Contrast the relative concentrations of important...Ch. 42.2 - Prob. 2LOCh. 42.2 - Prob. 3LOCh. 42.3 - Prob. 1LOCh. 42.3 - Prob. 2LOCh. 42.3 - Prob. 3LOCh. 42.4 - Prob. 1LO
Ch. 42.4 - Prob. 2LOCh. 42.4 - Prob. 3LOCh. 42.5 - Describe the organization of the peripheral...Ch. 42.5 - Prob. 2LOCh. 42.5 - Prob. 3LOCh. 42.5 - Prob. 4LOCh. 42 - Data analysis Draw the resulting potentials for...Ch. 42 - Prob. 2DACh. 42 - Which of the following best describes the...Ch. 42 - The ____ cannot be controlled by conscious...Ch. 42 - Prob. 3UCh. 42 - Inhibitory neurotransmitters a. hyperpolarize...Ch. 42 - White matter is ______, and gray matter is...Ch. 42 - During an action potential a. the rising phase is...Ch. 42 - Prob. 7UCh. 42 - Imagine that you are doing an experiment on the...Ch. 42 - The Na+/K+ ATPase pump is a. not required for...Ch. 42 - Prob. 3ACh. 42 - The following is a list of the components of a...Ch. 42 - Prob. 5ACh. 42 - As you sit quietly reading this sentence, the part...Ch. 42 - G proteincoupled receptors are involved in the...Ch. 42 - Tetraethylammonium (TEA) is a drug that blocks...Ch. 42 - Describe the status of the Na+ and K+ channels at...Ch. 42 - Describe the steps required to produce an...Ch. 42 - Prob. 4S
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- Depolarisation & repolarisation in metaneuron - put the following events in order (from 1 to 4). Membrane potential crosses the threshold potential and an action potential is achieved. Depolarisation occurs when the applied current is sufficient to move membrane potential towards neutral. The neuron’s membrane potential drops below the initial resting membrane potential and temporarily becomes refractory to further action potentials. Membrane quickly repolarises by opening of K+ channels, allowing K+ions to leave the cell and charge separation to be re-established.arrow_forwardWhat is the free energy change for the transport of calcium ions (Ca++) across a membrane from a region (left) where the concentration is 50 micromolar to a region (right) where the concentration is 50 micromolar? A membrane potential of 60 mV exists across the membrane where the right side is more negative than the left side. The temperature is 25 C.arrow_forwardExplain why the inside of the membrane changes form a jet negative charge to a positive charge at the peak of the action potential and then back to a net negative charge after the action of potential.arrow_forward
- An analog of cGMP, 8-Br-cGMP, will permeate cellular membranes, is only slowly degraded by a rod cell’s PDE activity, and is as effective as cGMP in opening the gated channel in the cell’s outer segment. If you suspended rod cells in a buffer containing a relatively high [8-Br-cGMP], then illuminatedthe cells while measuring their membrane potential, what would you observe?arrow_forwardMembrane potential in cells is constantly fluctuating. These fluctuations are called graded potentials and we will learn more about them in future lectures. Look at the fluctuating graded potential in the graph as an example. If Cl- generally has a relatively low membrane permeability, how would increasing Cl- permeability affect this graph?arrow_forwardLet's say you have neurons in a petrie dish bath in a solution in which the extracellular K+ concentration is 5 mM and the intracellular concentration is 100 mM. Now you flood the dish with a solution containing K+ at 115 mM. What will be the Equilibrium Potential now for the cell (rounded up to the next integer)? O O mv O 4 mv O 70 mv O -70 mvarrow_forward
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