Loose-leaf Version for What Is Life? A Guide to Biology 4E & LaunchPad for What is Life? A Guide to Biology 4E (Twelve Month Access)
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ISBN: 9781319154639
Author: Jay Phelan
Publisher: W.H. Freeman & Co
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Chapter 21, Problem 3MC
Summary Introduction
Introduction:
Neurons are the cells of the nervous system, responsible for carrying electrical signals. They are assisted by glial cells.
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The following is incorrect about directions of impulses in the neurons
Select one:
a.
Sensory or afferent neurons: transmit impulses from sense organs to the CNS.
O.
b.
Motor or afferent neurons: carry impulses from CNS to effector organs
c Association or interneuron: lies between the sensory & motor neurons
Motor neurons are divided into upper and lower motor neurons
All are incorrect
At an electrical synapse, presynaptic and postsynaptic membranes interface through a. neurofibril nodes. b. gap junctions. c. telodendria. d. neurotransmitters.
At an electrical synapse, presynaptic and postsynapticmembranes interface througha. neurofibril nodes.b. gap junctions.c. terminal arborizations.d. neurotransmitters.
Chapter 21 Solutions
Loose-leaf Version for What Is Life? A Guide to Biology 4E & LaunchPad for What is Life? A Guide to Biology 4E (Twelve Month Access)
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- Which of the following is something that glia do NOT do? a. Synchronize activity of a group of axons b. Remove waste material c. Dilate blood vessels to increase blood flow to the most active brain areas d. Conduct action potentialsarrow_forwardNeurons have three main components. Describe the function of each one a. Dendrites b. Cell body c. Axon i. Myelin sheetarrow_forwardThe cell body of a neuron does all of the following except a. release neurotransmitter into the synaptic cleft. b. produce synaptic vesicles containing neurotransmitter that are subsequently transported to the synaptic knob. c. conduct graded potentials to the initial segment. d. receive graded potentials from dendrites.arrow_forward
- Briefly discuss each function of the following parts of the neuron:a. Dendritesb. Cell bodyc. Axonarrow_forwardCell bodies of neurons are most likely found in the: a. white matter of the brain b. white matter of the spinal cord c. subarachnoid space d. gray matter of the spinal cordarrow_forwardWhich of the following is not a structural component of a chemical synapse? A. Presynaptic Knob B. Synaptic Cleft C. Postsynaptic Membrane D. All of the above.arrow_forward
- The morphological difference between bipolar neurons and unipolar neurons is_ and that determines how they are classified. a. the type of neurotransmitter they contain b. one is a Golgi Type I and the other is a Golgi Type II c. the number of axons that they have d. the number of different types of neurotransmitters they contain e. none of the abovearrow_forward17) What part of a neuron contains the nucleus? a. Dendrite.b. Cell body (soma).c. Axon.d. Node of Ranvier. 18) Which type of glial cell is a macrophage ( phagocyte )?a. Microglia.b. AstrocYte.c. Oligodendrocyte. d. Schwann cell.arrow_forwardNeurons are highly specialized cells whose form matches their function. They are highly elongated cells that conduct [Select ] a. ["electrical", b. "chemical"] signals across large distances, and [ Select ] ["chemical", b. "electrical"] a. signals across tiny spaces between neurons called [ Select ] a. ["hillocks", b. "Summations", c. "synapses"] . Neurons use vast amounts of energy to maintain the [Select] a. ["polarization", b."resting membrane potential", c. "action potential through the actions of [ Select ] a. ["sodium-potassium pumps", b."voltage-gated sodium channels", c."voltage-gated potassium channels"] . In doing so both sodium and potassium are trafficked against their concentration gradients leading to high concentrations of sodium [Select ] a. ["inside" , b. "outside"] the cell, and high concentrations of potassium [ Select ]arrow_forward
- The function of neuroglia is to a. carry messages from the PNS to the CNS. b. support and protect neurons. c. stimulate muscle contraction. d. store memories.arrow_forwardSchwann cells are a type of glial cell found in the nervous system. In addition to the conduction of nerve impulses, the outermost layer called neurilemma aids in nerve development and regeneration. Which of the following explains why the neurons in the brain cannot repair damage like the neurons in your hands or feet can? a. Neurons in the central nervous system lack neurilemma of Schwann cells. b. Neurons in the peripheral nervous system are surrounded by grey matter. c. Axons of the peripheral nervous system lack neurilemma of Schwann cells. d. Neurons in the central nervous system are surrounded by white matter.arrow_forward1) Which of the following accurately describes the direction of an impulse moving through a neuron that carries information to the central nervous system (CNS) from the peripheral nervous system (PNS)?a. A sensory (afferent) neuron, impulse moving distally.b. A motor (efferent) neuron, impulse moving proximally.c. A motor (efferent neuron, impulse moving distally.d. A sensory (afferent) neuron, impulse moving proximally. 2) The central nervous system (CNS) is composed ofa. spinal nerves.b. sense receptors.c. the brain and spinal cord.d. nerves of the internal organs.arrow_forward
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Nervous System - Get to know our nervous system a bit closer, how does it works? | Neurology; Author: FreeMedEducation;https://www.youtube.com/watch?v=6O-0CVAgaEM;License: Standard youtube license