Which of the following sentences is NOT correct? A. Axon can branch B. Afferent neurons are generally bipolar neurons C. Most neurotransmitters are synthesized in the cytosol of a neuron D. GABA is the most common inhibitory neurotransmitter in the central nervous system E. Ligaments connect muscles to bone

Which of the following sentences is NOT correct? A. Axon can branch B. Afferent neurons are generally bipolar neurons C. Most neurotransmitters are synthesized in the cytosol of a neuron D. GABA is the most common inhibitory neurotransmitter in the central nervous system E. Ligaments connect muscles to bone

Biology: The Dynamic Science (MindTap Course List)

4th Edition

ISBN:9781305389892

Author:Peter J. Russell, Paul E. Hertz, Beverly McMillan

Publisher:Peter J. Russell, Paul E. Hertz, Beverly McMillan

Chapter39: Information Flow And The Neuron

Section: Chapter Questions

Problem 8TYK: Which of the following statements best describes saltatory conduction? a. It inhibits direct...

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An 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.
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?
Match the terms with their descriptions. ____ thalamus a. coordinates motor activity ____ dopamine b. connects the hemispheres ____ limbic system c. protects brain and spinal cord from some toxins ____ corpus callosum d. one type of neurotransmitter ____ cerebral cortex e. support team for neurons ____ cerebellum f. wrap brain and spinal cord ____ neuroglia g. roles in emotion and memory ____ ganglion h. most complex integration ____ blood-brain barrier i. cluster of neuron cell bodies ____ meninges j. regulates sleep-wake cycle
Figure 35.26 Which of the following statements is false? The parasympathetic pathway is responsible for relaxing the body, while the sympathetic pathway is responsible for preparing for an emergency. Most preganglionic neurons in the sympathetic pathway originate in the spinal cord. Slowing of the heartbeat is a parasympathetic response. Parasympathetic neurons are responsible for releasing norepinephrine on the target organ, while sympathetic neurons are responsible for releasing acetylcholine.
Action potentials occur when ______. a. potassium gates close b. a stimulus pushes membrane potential to threshold c. sodium-potassium pumps become active d. neurotransmitter is reabsorbed
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?
Which of the following statements best describes saltatory conduction? a. It inhibits direct neurotransmitter release. b. It transmits the action potential at the nodes of Ranvier andthus speeds up impulses on myelinated axons. c. It increases neurotransmitter release at the presynapticmembrane. d. It decreases neurotransmitter uptake at chemically gatedpostsynaptic channels. e. It removes neurotransmitters from the synaptic cleft.
The peripheral nervous system that transfers signal to the brain is the:a. sympathetic nervous system b. parasympathetic nervous system c. sensory nervous systemd. central nervous system