WHAT IS LIFE? A GUIDE TO BIO 3E+LAUNCHPA
3rd Edition
ISBN: 9781319103316
Author: PHELAN
Publisher: Macmillan Higher Education
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Chapter 20, Problem 5MC
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.
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
Briefly discuss each function of the following parts of the neuron:a. Dendritesb. Cell bodyc. Axon
Chapter 20 Solutions
WHAT IS LIFE? A GUIDE TO BIO 3E+LAUNCHPA
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- Which 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_forwardA collection of neuron cell bodies located outside the CNS is called a. a tract. b. a nerve. c. a nucleus. d. a ganglion.arrow_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_forward
- Neurons 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_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_forward32) 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_forward
- The integrative functions of the nervous system are performed mainly bya. afferent neurons.b. efferent neurons.c. neuroglia.d. sensory neurons.e. interneurons.arrow_forwardA synapse consists of: a. a synaptic knob b. neuron cell body c. plasma membrane of post synaptic neuron d. a synaptic knob, synaptic cleft, and plasma membrane of post synaptic neuronarrow_forwardMatch the types of neuroglia to their functions. (1) ependymal cells (2) oligodendrocytes (3) astrocytes (4) Schwann cells (5) microglial cells A. form a myelin sheath around peripheral nerves B. phagocytize cellular debris and bacteria C. line inner parts of ventricles and spinal cord D. form scar tissue and regulate ion and nutrient concentrations in the CNS E. form a myelin sheath around neurons in the CNSarrow_forward
- Neurons contain ________, which can receive signals from other neurons. a. axons b. mitochondria c. dendrites d. Golgibodiesarrow_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. After examining the image below, can you explain why brain cells have a. Neurons in the central nervous system lack neurilemma of Schwann cells. b. Neurons in the central nervous system are surrounded by white matter. c. Axons of the peripheral nervous system lack neurilemma of Schwann cells. d. Neurons in the peripheral nervous system are surrounded by grey matter.arrow_forwardNeurotransmitters must pass from an axon terminal to the next dendrite by crossing a fluid-filled space called the a. synapse. c. neuron. b. reuptake inhibitor. d. glial cell.arrow_forward
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