Which of the following accurately describes neurons? (Select all that apply.) All neurons have four functional zones. Multipolar neurons can have many dendrites and many axons. Some neurons lack a nucleus. Unipolar neurons are especially common in the visual cortex. 0000
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- What function do unipolar neurons provide and where is their cell body found? They are motor neurons with their cell body in the central nervous system They are sensory neurons with their cell body located in the central nervous system They are motor neurons with their cell body located outside of the central nervous system They are sensory neurons with their cell body located outside of the central nervous systemWith the help of figure 12.6 on page 395 and the definitions below, label the following diagram of a typical neuron. axon - the long extension of a neuron that carries nerve impulses away from myelin sheath - the fatty substance that surrounds and the body of the cell. axon terminals - the hair-like ends of node of Ranvier - one of the many gaps in the myelin the axon cell body - the cell body of the neuron; it contains the nucleus and other cell organelles dendrites - the branching structure of Schwann's cells - cells that produce myelin - they are a neuron that receives messages |(attached to the cell body) 1. protects some nerve fibers sheath – impulses jump from node to node resulting in faster transmission nucleus - the organelle in the cell body of the neuron that contains the genetic material of the cell located within the myelin sheath. ©EnchantedLearning.com Place an arrow along the diagram to indicate the direction that impulses travel long the neuron. 2.Which of the following is not true of glial cells? They are more numerous than neurons. They transmit information. They have diverse functions in support of neurons. They can be a cause of brain tumors.
- These neurons belongs to the CNS: (More than one possible choice) A neuron in the brain A neuron carrying a signal into a skeletal muscle A neuron carrying a signal into cardiac muscle A neuron carrying signals form receptors in the skin A neuron carrying signals from the stomach a neuron in the spinal cord grey matterStellate cells and pyramidal cells are examples of different types of: sensory neurons. motor neurons. interneurons. principal neurons.Identify and label the following structures on the neuron model figure below: cell body, dendrites, neuron nucleus, neurolemma, axon hillock, nucleus of Schwann cell, Nissl bodies, myelin sheath, axon, node of Ranvier, axon terminals (of neurons synapsing with model neuron), endoneurium (refer to Figure 10.6). 3) 11
- Multiple sclerosis is a demyelinating disease affecting the central nervous system. What type of cell would be the most likely target of this disease? Why? Which type of neuron, based on its shape, is best suited for relaying information directly from one neuron to another? Explain why. Sensory fibers, or pathways, are referred to as “afferent.” Motor fibers, or pathways, are referred to as “efferent.” What can you infer about the meaning of these two terms (afferent and efferent) in a structural or anatomical context?Demyelination is the loss of myelin from neurones that are normally myelinated. Multiple sclerosis is a disease in which demyelination occurs in neurones involved in coordinating muscle movement. Using your knowledge of nerve impulse generation and propagation, explain how nerve impulse generation and propagation would be affected in people who have multiple sclerosis. The explanation needs to be in the form of a step by step sequence of annotated drawings. This could be in the form of an annotated cartoon/picture strip. Compare this to nerve impulse generation and propagation in an individual who does not have multiple sclerosis.The following table summarizes the characteristics of four different neurons. Based on these characteristics, which of these neurons would most likely have the slowest conduction velocity? Neuron #3 #4 O #1 O #2 #3 O #4 Diameter (μM) P Myelination no
- Which of these alternatives shows the correct order for a neuron that is leaving the spine? Think of the neuron starting at the spinal cord and an exiting the spine, going to your chest. What would be the path? It would travel out of the spine into the spinal nerve, past the dorsal branch and into the rootlet of the chest. into a spinal nerve, then into a ventral root and then into an anterior branch past a rootlet, into a ventral branch, past a dorsal root, and then to the chest past a rootlet, into a ventral root, into a spinal nerve and then into an anterior branchWhich of the following cells helps control the concentration of ions in the chemical environment surrounding the neurons? satellite cells astrocytes Schwann cells oligodendrocytes two of the aboveA voltmeter is used to measure the potential difference across a neuron’s membrane. A change in potential difference will occur when an action potential is generated. A neurologist uses a giant squid neuron to study the propagation of an action potential. She places two voltmeters on the axon membrane to measure the potential difference: one near the dendrite and the other at the axon terminal. A stimulus is then applied. Often, the stimulus is applied at one end of the neuron. In this experiment, the scientist decides to stimulate the middle of the neuron. Which statement describes what the scientist would observe at the voltmeters? Select one: a. Both voltmeters will indicate changes to the potential difference. b. No changes to the potential differences will be registered at the voltmeters. c. The voltmeter at the dendrite will indicate a change to the potential difference. d. The voltmeter at the axon terminal will indicate a change to the potential difference.
