EBK WHAT IS LIFE? A GUIDE TO BIOLOGY WI
4th Edition
ISBN: 8220106821152
Author: PHELAN
Publisher: YUZU
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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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At an electrical synapse, presynaptic and postsynaptic membranes interface through a. neurofibril nodes. b. gap junctions. c. telodendria. d. neurotransmitters.
Neurons have three main components. Describe the function of each one
a. Dendrites
b. Cell body
c. Axon
i. Myelin sheet
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 potentials
Chapter 21 Solutions
EBK WHAT IS LIFE? A GUIDE TO BIOLOGY WI
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- The 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_forwardBriefly discuss each function of the following parts of the neuron:a. Dendritesb. Cell bodyc. Axonarrow_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_forwardThe 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_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
- Briefly discuss each function of the following parts of the neuron:d. Nucleus e. Nucleus of Schwann cellf. Node of Ranvierg. Axon terminalarrow_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_forwardA synapse includes: a. a very narrow synaptic cleft b. a presynaptic neuron with neurotransmitter receptor sites on its membrane c. a postsynaptic neuron that releases the neurotransmitter d. all of the above The upper abdominopelvic regions include the: a. right and left iliac and epigastric b. right and left lumbar and umbilical c. right and left hypochondriac and epigastric d. right and left hypochondriac and umbilical A decrease in insulin production: a. usually causes type I diabetes mellitus b. will stimulate the release of growth hormone c. is usually the cause of type II diabetes mellitus d. both a and c abovearrow_forward
- 32) In order for a nerve impulse to be transmitted across a synapse, a neurotransmitter must be released froma. an axon terminal.b. a dendrite.c. a soma.d. an axon hillock. 33) What part of a neuron is responsible for receiving information?a. Axon.b. Node of Ranvier. c. Dendrite.d. Myelin sheath.arrow_forwardWhich of the following is not a special characteristic of neurons? a. they are long-lived lasting an individual’s lifespan b. they are all amitotic c. they have a high metabolic rate d. all of the above e. none of the abovearrow_forwardThe integrative functions of the nervous system are performed mainly bya. afferent neurons.b. efferent neurons.c. neuroglia.d. sensory neurons.e. interneurons.arrow_forward
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