Biology
5th Edition
ISBN: 9781260487947
Author: BROOKER
Publisher: MCG
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Chapter 50.2, Problem 1CS
Summary Introduction
To determine: Whether dopamine is considered as a neurotransmitter or hormone.
Introduction: Neurotransmitters are endogenous chemicals which are used for the transmission of a signal across a synapse. However, the chemical messengers, which are directly secreted into the bloodstream, are called hormones.
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Inhibitory post synaptic membrane potential - Data
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Nr of GABA
inside
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Voltage (mV)
outside
receptors
140
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00
140
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- 34.428
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Questions
11. What is an IPSP?
12. GABA receptors on the postsynaptic neuron function as ion channels for which
ion?
13. Based on the data collected, when is it more possible for an action potential to
occur? When the intracellular Cl- concentration in the postsynaptic neuron increases
or when the number of GABA receptors on the postsynaptic membrane increases?
14. Explain
Given the steps shown below, which of the following is the correct sequence for transmission at a
chemical synapse?
1. neurotransmitter binds with receptor
2. sodium ions rush into neuron's cytoplasm
3. action potential depolarizes the presynaptic membrane
4. ion channel opens to allow particular ion to enter cell
5. synaptic vesicles release neurotransmitter into the synaptic cleft
O 1, 2, 3, 4, 5
O 5, 1, 2, 4, 3
O 2, 3, 5, 4, 1
O4, 3, 1, 2, 5
O 3, 2, 5, 1, 4
Subject: Neurophysiology
The neuron for this experiment is in a bath with [K+] = 2 mM and [Na+] = 150 mM.
Calculate the Nernst Equilibrium potential for each ion.
What is your estimate for the gNa and for gK? If you are more comfortable, use PNa and PK. Remember, these values should be between 0 and 1.
What is the resting membrane potential for this cell?
Draw an action potential for this neuron in this solution. Keep in mind that this neuron is in unusual solutions. Label each axis and indicate inward and outward currents. Be absolutely certain to label the peak voltage and threshold for the AP!
Chapter 50 Solutions
Biology
Ch. 50.2 - Prob. 1CSCh. 50.3 - Prob. 1CSCh. 50.3 - Prob. 1EQCh. 50.3 - Prob. 2EQCh. 50.3 - Prob. 3EQCh. 50.4 - Prob. 1CCCh. 50.4 - Prob. 1CSCh. 50.4 - Prob. 2CCCh. 50.5 - Prob. 1CCCh. 50.5 - Prob. 2CC
Ch. 50 - Which is the defining feature of hormones? a. They...Ch. 50 - Steroid hormones are synthesized from ______blank...Ch. 50 - Prob. 3TYCh. 50 - Prob. 4TYCh. 50 - Prob. 5TYCh. 50 - Prob. 6TYCh. 50 - Which of the following pairs of hormones are...Ch. 50 - In invertebrates, molting of larvae is stimulated...Ch. 50 - Which of the following is true of the adrenal...Ch. 50 - Prob. 10TYCh. 50 - Prob. 1CQCh. 50 - Distinguish between type 1 and type 2 diabetes...Ch. 50 - Core Concept: Systems Organ systems often exert...Ch. 50 - Discuss the roles of hormones in growth and...Ch. 50 - Prob. 2COQ
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- Remaining Time: 1 hour, 16 minutes, 05 seconds. Qu B BIUS Paragraph V Arial P 田 心田 V 10pt X2 X2 # A = K7 ヒン V V V A V V T +] ABC V r T " Π 99 Ω € + QUESTION 27 What is the correct time-span for each stage in the "information processing model"? For each of the stages (sensory, short-term, and long- term), choose letter A, B, or C. Sensory Long-term memory Short-term (or working) memory A. Days to Years B. 1-2 seconds C. 30 seconds to several minutes QUESTION 28 Which one below does not describe the meaning of "episodic memory? This refers to remembering events and experiences at specific times and places. This refers to remembering the sequence of events and when things happened.arrow_forwardWhat is the mechanism by which voltage-gated channels open in response to voltage changes? Choose the best answer: (a) Voltage changes cause release of ligand (b) Voltage changes shift the receptor from the inactivated to active state (c) Charged residues in the channel lead to a conformation change (d) Voltage changes lead to increased force from ions attempting to pass through (e) Voltage changes increase ion channel expression I wish to select answer (c), but I am not sure it is the best answer compared with (b) and (d). Thus I wish to seek your expertise advice.arrow_forwardNeed help Explain neurons as a specialized form of cell signalling that acts long-distance, rapidly, and on defined target cells. How do neurons use existing Na/K gradients? Why do our brains consume massive amounts of energy (glucose)? Be able to explain the role of gated channels in neuron action potential signalling.arrow_forward
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