A&P INTEG APPRCH LL
4th Edition
ISBN: 9781266242748
Author: McKinley
Publisher: MCG
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Chapter 12, Problem 10DYKB
Summary Introduction
Introduction:
Neurons are associated with the transmission of nerve impulses between the brain and the receptors and effectors. Each neuron (or nerve cell) possesses an axon, along with a cell body, and dendrites. Certain neurons also possess an additional lipid layer called the myelin sheath.
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Students have asked these similar questions
If a post synaptic neuron is stimulated to threshold by spatial summation this implies that
the post synaptic cell has a lower than normal threshold
the postsynaptic cell has many synapses with many presynaptic neurons
the post synaptic cell is getting stimulated many times during a short period of time by a single
presynaptic neuron
the post synaptic cell is slow to repolarize
You have bunch of neurons in alive in a dish. You are recording from the axon hillock of one neuron while you stimulate an action potential in another neuron that synapses on the neuron you are recording from. One action potential from your presynaptic neuron causes +5 mV depolarization in the postsynaptic neuron’s axon hillock. Threshold for this neuron requires +10 mV. How can you most assuredly achieve threshold for this post-synaptic neuron?
Group of answer choices
Firing the presynaptic neuron multiple times in close succession
Firing the presynaptic neuron plus another random presynaptic neuron that you find in the dish
You can’t a +5mV EPSP will never be able to reach a 10mV threshold
Firing the presynaptic neuron multiple times but keep the firing events spaced out really far in time.
A myelinated axon conducts nerve impulses at a speed of 40 m/s. If the myelination made the speed of action potential increase by a factor of 50 and time constant is 1ms, what is the space constant
for the unmyelinated axon?
Aunmyelinated
X mm
Chapter 12 Solutions
A&P INTEG APPRCH LL
Ch. 12.1 - Prob. 1WDYLCh. 12.1 - Prob. 2WDYLCh. 12.1 - Prob. 3WDYLCh. 12.2 - Prob. 4WDYLCh. 12.2 - Prob. 5WDYLCh. 12.2 - Prob. 6WDYLCh. 12.2 - Prob. 7WDYLCh. 12.2 - Prob. 8WDYLCh. 12.3 - Prob. 9WDYLCh. 12.4 - If a person has a brain tumor, is it more likely...
Ch. 12.4 - Prob. 11WDYLCh. 12.4 - Prob. 12WDYLCh. 12.4 - Prob. 13WDYLCh. 12.5 - Prob. 14WDYLCh. 12.5 - Prob. 15WDYLCh. 12.6 - Prob. 16WDYLCh. 12.6 - Prob. 17WDYLCh. 12.7 - Prob. 18WDYLCh. 12.7 - Prob. 19WDYLCh. 12.7 - Prob. 20WDYLCh. 12.8 - How are EPSP and IPSP graded potentials...Ch. 12.8 - Prob. 22WDYLCh. 12.8 - How does depolarization and repolarization occur...Ch. 12.8 - Prob. 24WDYLCh. 12.8 - Prob. 25WDYLCh. 12.9 - Prob. 26WDYLCh. 12.9 - Prob. 27WDYLCh. 12.9 - Prob. 28WDYLCh. 12.10 - Prob. 29WDYLCh. 12.10 - Prob. 30WDYLCh. 12.10 - Prob. 31WDYLCh. 12.11 - Prob. 32WDYLCh. 12.11 - Prob. 33WDYLCh. 12 - Prob. 1DYKBCh. 12 - Prob. 2DYKBCh. 12 - Prob. 3DYKBCh. 12 - Prob. 4DYKBCh. 12 - Prob. 5DYKBCh. 12 - Prob. 6DYKBCh. 12 - _____ 7. An action potential is generated when...Ch. 12 - Prob. 8DYKBCh. 12 - Prob. 9DYKBCh. 12 - Prob. 10DYKBCh. 12 - What are the four structural types of neurons? How...Ch. 12 - Prob. 12DYKBCh. 12 - How does myelination differ between the CNS and...Ch. 12 - Describe the procedure by which a PNS axon may...Ch. 12 - Prob. 15DYKBCh. 12 - Prob. 16DYKBCh. 12 - Explain summation of EPSPs and IPSPs and the...Ch. 12 - Graph and explain the events associated with an...Ch. 12 - Prob. 19DYKBCh. 12 - Prob. 20DYKBCh. 12 - Prob. 1CALCh. 12 - Prob. 2CALCh. 12 - Prob. 3CALCh. 12 - Prob. 4CALCh. 12 - Sarah wants to call her new friend Julie and needs...Ch. 12 - Over a period of 6 to 9 months, Marianne began to...Ch. 12 - Prob. 2CSLCh. 12 - Prob. 3CSL
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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
- View the University of Michigan Webscope (http://openstaxcollege.org/l/nervefiber) to see an electron micrograph of a cross-section of a myelinated nerve fiber. The axon contains microtubules and neurofilaments, bounded by a plasma membrane known as the axolemma. Outside the plasma membrane of the axon is the myelin sheath, which is composed of the tightly wrapped plasma membrane of a Schwann cell. What aspects of the cells in this image react with the stain that makes them the deep, dark, black color, such as the multiple layers that are the myelin sheath?arrow_forwardA(n)______neuron has one axon and one____ dendrite extending directly from the cell body. unipolar bipolar multipolar pseudounipolararrow_forwardA neuron responds to adequate stimulation with _______, a type of self-propagating signal.arrow_forward
- Stellate cells initially process sensory input to the cortex, whereas pyramidal cells send fibers from the cortex to terminate on efferent motor neurons. (True or false)arrow_forwardWatch this video (http://openstaxcollege.org/l/neurotrans) to learn about the release of a neurotransmitter. The action potential reaches the end of the axon, called the axon terminal, and a chemical signal is released to tell the target cell to do something, either initiate a new action potential, or to suppress that activity. In a very short space, the electrical signal of the action potential is changed into the chemical signal of a neurotransmitter, and then back to electrical changes in the target cell membrane. What is the importance of voltage-gated calcium channels in the release of neurotransmitters?arrow_forwardIn the propagation of a nerve impulse: a. the refractory period begins as the K+ channel opens, allowing K+ ions to flow outward along their concentrationgradient. b. Na+ ions flow out of the axon with their concentration gradient. c. positive charges lower the membrane potential to its lowestaction potential. d. gated K+ channels open at the same time as the activationgate of Na+ channels closes. e. the depolarizing stimulus lowers the membrane potential toopen the Na+ gates.arrow_forward
- Choose all that apply [Na*] + [K'] | + + + + This diagram is a drawing of normal conditions that occur in a neuron's axon (not all details are included). This stage that a living neuron would be in, would show that no positive ions are inside the cell current is traveling down the axon the cell will be at rest once the Na ions enter the cell the cell is at rest Na ions are predominantly outside the celarrow_forwardWhich of the following statements best describes the properties of a myelinated axons? The axon has an even distribution of ion channels but it is covered by layers of myelin apart from short sections termed the nodes of Ranvier where there is no myelin. The action potential is able to jump from node to node because the myelin sheath increases the length constant. There are very few ion channels underneath the myelin. The density of Na+ channels at the nodes of Ranvier is very high but there are no K+ channels in myelinated axons. The myelin sheath increases the rate of action potential conduction because the action potential underneath the myelin sheath travels faster than an action potential in an unmyelinated axon.arrow_forwardWhat stage of the action potential is illustrated by the set up shown? interstitial fuid axon cytoplasm interstitial fiuid Resting potential Hyperpolarization O Depolarization Repolarization K'charnelarrow_forward
- If a neuron is stimulated simultaneously by 2 stimuli at its dendrites (one generates a very large hyperpolarizing potential and the other generates a very small depolarizing potential). What would happen to this neuron? Group of answer choices The summation of these two graded potentials will generate an action potential and this action potential will travel down the axon. Summation of these two graded potentials will cause the membrane potential at the axon hillock to be more negative. These graded potentials will bring the resting membrane potential to 0 mV. These graded potentials with opposite polarity would therefore generate two action potentials and they will travel along this neuron in opposite direction.arrow_forwardOrder the following in the correct sequence that results in generation of action potential local potential is generated at axon hillock action potential may or may not result in subsequent post synaptic neuron depending on type of neurotransmitter and receptors etc. stimulus is picked up by dendrites If the potential reaches a threshold, action potential spreads throughout the axon signal then reaches synaptic knob, which releases neurotrasmitters A Moving to another question will save this response. « < Question 51 17 étv 80 DII DD F2 F3 F4 F5 F9 F10 23 24 2 3 4 5 6 7 8. 10 R T Y S. D J K C V * COarrow_forwardAn EPSP facilitates depolarization of the postsynaptic membrane by O increasing the permeability of the membrane to K+. O stimulating the Na+-K+ pump. O allowing Cl- to enter the cell. O increasing the permeability of the membrane to Na+. O insulating the hillock region of the axon.arrow_forward
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