BIOLOGY:CONCEPTS &...(LL) W/ACCESS +LM
4th Edition
ISBN: 9781260684506
Author: Hoefnagels
Publisher: MCG
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Chapter 26, Problem 2PIT
Summary Introduction
To add:
The term axons and myelin to the concept map.
Concept introduction:
The neuron is a basic functional unit of nervous system and is the specialized cells of nervous system that makes a complex network for the transmission of messages. It is rapid and efficient network of nervous system. A neuron involves a cell body, nerve fibers: dendrites and an axon in its structure.
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1. Explain what will happen in an axon undergoing an action potential but which is unable to utilize monosaccharides for cellular respiration.
9 Describe how the sequential opening and closing of voltage-gated sodium and potassium channels leads to depolarization and repolarization of the membrane and results in the propagation of a signal along the axon of a neuronal cell
16. The node are the area on the axon which
A. Have no myelin sheath
B. Have no cytoplasm
C. Do not allow movement of ions
D. Do not allow changes in permeability
Chapter 26 Solutions
BIOLOGY:CONCEPTS &...(LL) W/ACCESS +LM
Ch. 26.1 - Prob. 1MCCh. 26.1 - Prob. 2MCCh. 26.1 - Prob. 3MCCh. 26.2 - Prob. 1MCCh. 26.2 - Where is the myelin sheath located?Ch. 26.2 - Prob. 3MCCh. 26.2 - What are the functions of each of the three...Ch. 26.3 - Describe the forces that maintain the distribution...Ch. 26.3 - Prob. 2MCCh. 26.3 - Prob. 3MC
Ch. 26.3 - Prob. 4MCCh. 26.3 - What prevents action potentials from spreading in...Ch. 26.3 - Prob. 6MCCh. 26.3 - How do myelin and the nodes of Ranvier speed...Ch. 26.4 - Describe the structure of a synapse.Ch. 26.4 - Prob. 2MCCh. 26.4 - Prob. 3MCCh. 26.4 - Prob. 4MCCh. 26.5 - Prob. 1MCCh. 26.5 - Prob. 2MCCh. 26.5 - Prob. 3MCCh. 26.5 - Prob. 4MCCh. 26.6 - Prob. 1MCCh. 26.6 - Prob. 2MCCh. 26.6 - Prob. 3MCCh. 26.6 - List some structures that protect the central...Ch. 26.6 - Prob. 5MCCh. 26.7 - The researchers conducted a behavioral experiment...Ch. 26.7 - Prob. 2MCCh. 26 - Some cells of the central nervous system are...Ch. 26 - Prob. 2MCQCh. 26 - Prob. 3MCQCh. 26 - What event triggers an action potential? a....Ch. 26 - Prob. 5MCQCh. 26 - Prob. 6MCQCh. 26 - Prob. 7MCQCh. 26 - Prob. 8MCQCh. 26 - Damage to the surface tissue of the spinal cord...Ch. 26 - Prob. 10MCQCh. 26 - Describe some invertebrate nervous systems. Why do...Ch. 26 - Prob. 2WIOCh. 26 - Prob. 3WIOCh. 26 - Prob. 4WIOCh. 26 - What is the connection between the threshold...Ch. 26 - Write a nonbiological analogy for resting...Ch. 26 - Prob. 7WIOCh. 26 - Sketch a synapse: label the axon and synaptic...Ch. 26 - Describe the events that occur at a synapse when a...Ch. 26 - Prob. 10WIOCh. 26 - Prob. 11WIOCh. 26 - Cerebral palsy is a nervous system disorder that...Ch. 26 - Traumatic brain injury can occur when a person...Ch. 26 - Prob. 14WIOCh. 26 - Prob. 15WIOCh. 26 - Prob. 16WIOCh. 26 - Prob. 17WIOCh. 26 - Prob. 1PITCh. 26 - Prob. 2PITCh. 26 - Prob. 3PITCh. 26 - PULL IT TOGETHER 4. Acid the somatic, autonomic,...
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- The part of a neuron that contains the nucleus is the cell body dendrite axon glialarrow_forwardWhich of the following does not contribute to propagation of action potentials? a. As the area outside the membrane becomes negative, itattracts ions from adjacent regions; as the inside of the membrane becomes positive, it attracts negative ions from nearby in the cytoplasm. These events depolarize nearby regions of the axon membrane. b. The refractory period allows the impulse to travel in only one direction. c. Each segment of the axon prevents the adjacent segments from firing. d. The magnitude of the action potential stays the same as it travels down the axon. e. Up to a limit, increasing the intensity of the stimulus increases the number of action potentials.arrow_forward1. A lesion with a bright signal on a DWI means that a. astrocytes and microglia are [proliferating to repair damage b. chronic atrophy (cell loss or shrinkage) is present c. the extracellular area has ex[anded due to neuronal death d. none of these are truearrow_forward
- Which of the following could not elicit a signal transduction response? a. a protein kinase b. a virus mimicking a normal signal molecule c. a peptide hormone d. a steroid hormone e. a neurotransmitterarrow_forwardWhich of the following is probably going to propagate an action potential fastest? a thin, unmyelinated axon a thin, myelinated axon a thick, unmyelinated axon a thick, myelinated axonarrow_forwardAn example of a synapse could be the site where: a. neurotransmitters released by an axon travel across a gap and are picked up by receptors on a muscle cell. b. an electrical impulse arrives at the end of a dendrite causingions to flow onto axons of presynaptic neurons. c. postsynaptic neurons transmit a signal across a cleft to apresynaptic neuron. d. oligodendrocytes contact the dendrites of an afferent neurondirectly. e. an onoff switch stimulates an electrical impulse in apresynaptic cell to stimulate other presynaptic cells.arrow_forward
- Which term describes a bundle of axons in the peripheral nervous system? nucleus b. ganglion tract nervearrow_forward3.In one to two sentences.. describe what the difference between nuclei and ganglia isarrow_forward2. Discuss the role of ion channels in the initiation of neuronal excitability.arrow_forward
- 4. Which term describes the cell membrane potential of a neuron at rest? a. polarized b. depolarized c. hyperpolarized d. repolarized e. sympolarizedarrow_forward4. What are the problems with a repaired PNS axon? 5. Identify the kind of neuronal pool based on the information provided.a. Several presynaptic neurons synapse on the same postsynaptic neuron giving strong excitation or inhibition.b. Input neuron stimulates several pathways which stimulate the output neuron to go on firing for a longer time after input has truly stopped. c. On presynaptic neuron synapses on 2 or 3 postsynaptic neurons and these postsynaptic neurons (now presynaptic ) synapse on another 2 or 3 postsynaptic neurons.d. Neurons stimulate each other in a linear sequence but one cell restimulates the first cell (presynaptic neuron) to start the process all over again. e. This neuron pool is common in the withdrawal reflex. f. Diaphragm and rib muscles both under subconscious control, but can be consciously overridden when holding your breath.g. Pain information spreads quickly into multiple areas of CNS.h. Major type pathway in short-term memoryarrow_forward1. An action potential does occur in response to a _____ , which strong enough to depolarize the membrane to threshold.arrow_forward
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