Principles of Biology
2nd Edition
ISBN: 9781259875120
Author: Robert Brooker, Eric P. Widmaier Dr., Linda Graham Dr. Ph.D., Peter Stiling Dr. Ph.D.
Publisher: McGraw-Hill Education
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Chapter 33.1, Problem 2TYK
Summary Introduction
Introduction: The nervous system can be defined as a highly complex portion of an animal which directs its actions and sensory messages by transmitting signals to and from diverse body parts. The basic unit of the nervous system is known as the nerve cell or neuron.
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Where in a myelinated axon are nearly all of the ion channels concentrated?
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Which of the following describes the axon hillock?
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Chapter 33 Solutions
Principles of Biology
Ch. 33.1 - Which of the following is false? The CNS of...Ch. 33.1 - Prob. 2TYKCh. 33.1 - Prob. 1CCCh. 33.2 - Prob. 1CCCh. 33.2 - Prob. 1BCCh. 33.2 - Prob. 1TYKCh. 33.2 - The resting membrane potential occurs because the...Ch. 33.3 - Are ions the only substances that can move through...Ch. 33.3 - Prob. 1CCCh. 33.3 - Prob. 2CC
Ch. 33.3 - Which is false? Graded potentials may die out or...Ch. 33.3 - Action potentials require a threshold potential...Ch. 33.4 - Prob. 1CCCh. 33.4 - Prob. 1TYKCh. 33.4 - Prob. 2TYKCh. 33.5 - Prob. 1BCCh. 33.5 - Prob. 1TYKCh. 33.5 - Prob. 2TYKCh. 33.6 - Prob. 1CCCh. 33.6 - Prob. 2CCCh. 33.6 - Prob. 3CCCh. 33.6 - Prob. 1TYKCh. 33.6 - Prob. 2TYKCh. 33.7 - Prob. 1TYKCh. 33.7 - Therapeutic drugs that reduce symptoms of...Ch. 33 - Prob. 1TYCh. 33 - Prob. 2TYCh. 33 - Prob. 3TYCh. 33 - Neurons that function mainly in connecting other...Ch. 33 - Prob. 5TYCh. 33 - Prob. 6TYCh. 33 - Prob. 7TYCh. 33 - Prob. 8TYCh. 33 - Prob. 9TYCh. 33 - Prob. 10TYCh. 33 - Describe the differences between graded and action...Ch. 33 - Prob. 2CCQCh. 33 - Prob. 3CCQCh. 33 - Prob. 1CBQCh. 33 - Prob. 2CBQ
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- With the help of figure 12.6 on page 395 and the definitions below, label the following diagram of a typical neuron. axon - the long extension of a neuron that carries nerve impulses away from myelin sheath - the fatty substance that surrounds and the body of the cell. axon terminals - the hair-like ends of node of Ranvier - one of the many gaps in the myelin the axon cell body - the cell body of the neuron; it contains the nucleus and other cell organelles dendrites - the branching structure of Schwann's cells - cells that produce myelin - they are a neuron that receives messages |(attached to the cell body) 1. protects some nerve fibers sheath – impulses jump from node to node resulting in faster transmission nucleus - the organelle in the cell body of the neuron that contains the genetic material of the cell located within the myelin sheath. ©EnchantedLearning.com Place an arrow along the diagram to indicate the direction that impulses travel long the neuron. 2.arrow_forwardPlace the following structures in the order that an electrical impulse would travel beginning with the post-synaptic membrane. Reset Dendrites Axon terminals Myelin sheath gap Neurosoma Axon hillock Internodal segment Terminal arborization 1 2 3 4 5 6 7arrow_forward1) The interior of an axon at rest is negatively charged relative to the outside is positively charged relative to the outside has the same charge as the outside has the same concentration of potassium (K+) as the outside 2) The branch-like portions of a neuron that carries information toward the cell body is the axon. dendrite. terminal button. soma.arrow_forward
- Which type of gates are located in the dendrite membrane of the post-synaptic cell? Voltage-sensitive gates. Chemically-sensitive gates. A mix of chemically-sensitive, voltage-sensitive, and mechanically-sensitive gates. Mechanically-sensitive gates Both Chemically-sensitive and voltage-sensitive gates.arrow_forwardYou 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.arrow_forwardThe neuron cell is made up of which of the following parts? Axon Dendrite Soma All of the abovearrow_forward
- Which part of the neuron provides insulation for the neurons, to prevent the loss of charged ions from the nerve cell? glial cell cell body myelin sheath dendrite axonarrow_forwardIf a graded receptor potential made the resting membrane potential of the axon more negative, you would expect: Subsequent action potentials to be reduced in their amplitude It to be easier for this axon to reach threshold voltage It to be more difficult for this axon to reach the threshold voltage Subsequent action potentials to be shorter in duration No change in the ability of this axon to reach threshold voltagearrow_forwardExcitatory neurotransmitters: rev neurons up. calm neurons down. do not undergo re-uptake. All of the abovearrow_forward
- In neurons, the direction of signal is always: Up axon to soma (cell body) Down soma (cell body) to dendrites O Up soma (cell body) to dendrites SEP O Down axon terminal to dendrites O Down axon towards axon terminalarrow_forwardNeurons always ____________________. have myelination around the axon. have multiple dendritic processes. have machinery for communication with other cells. release transmitter.arrow_forwardAn action potential is generated at the... trigger zone of the axon postsynaptic membrane cell body axon terminalarrow_forward
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