In neurons, the direction of signal is always: Up axon to soma (cell body) O Down soma (cell body) to dendrites O Up soma (cell body) to dendrites O Down axon terminal to dendrites O Down axon towards axon terminal

In neurons, the direction of signal is always: Up axon to soma (cell body) O Down soma (cell body) to dendrites O Up soma (cell body) to dendrites O Down axon terminal to dendrites O Down axon towards axon terminal

Biology 2e

2nd Edition

ISBN:9781947172517

Author:Matthew Douglas, Jung Choi, Mary Ann Clark

Publisher:Matthew Douglas, Jung Choi, Mary Ann Clark

Chapter35: The Nervous System

Section: Chapter Questions

Problem 1VCQ: Figure 35.3 Which of the following statements is false? The soma is the cell body of a nerve cell....

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Communication

Communication is a method of transferring information between two persons or organisms. Communication is possible using mutually understood behaviors such as signs, symbols, or language. In the year 1980, S. F. Scudder proposed communication theory. According to his ideas, all living beings on the earth communicate, but the methods of communication differ. Communication skills are now part of soft skills.

Question

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 terminal

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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?
Figure 35.3 Which of the following statements is false? The soma is the cell body of a nerve cell. Myelin sheath provides an insulating layer to the dendrites. Axons carry the signal from the soma to the target. Dendrites carry the signal to the soma.
Watch 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?
What is the term used to describe the rounded lump located at the end of the axon? synapses receptor sites terminal button O synaptic vesicles
Graded (Local) Potentials All or none Do not reach threshold Change in RMP Size depends on size of stimulus Chemically or mechanically gated channels Decreases in intensity Found in axon Found in dendrites Involve gated channels Involve K+ diffusion Involve Na+ diffusion Self-propagating Has a threshold Action Potentials Voltage gated channels Local signaling Long distance signaling
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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.
Which of the following describes the axon hillock? Part of neuron that passes nerve impulses to another cell Part of neuron that connects the axon to the neuron cell body Part of neuron that stores neurotransmitters Endoplasmic reticulum of the neuron Part of neuron that gives rise to axon collaterals
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