A new drug is developed that prevents the demyelination occurring in the progress of multiple sclerosis. The drug protects the cells responsible for the synthesis and maintenance of myelin in the central nervous system. These cells are most likely which of the following? (A) Astrocyte (B) Ependymal cell (C) Microglial cell Oligodendrocyte (E) Schwann cell

A new drug is developed that prevents the demyelination occurring in the progress of multiple sclerosis. The drug protects the cells responsible for the synthesis and maintenance of myelin in the central nervous system. These cells are most likely which of the following? (A) Astrocyte (B) Ependymal cell (C) Microglial cell Oligodendrocyte (E) Schwann cell

Human Anatomy & Physiology (11th Edition)

11th Edition

ISBN:9780134580999

Author:Elaine N. Marieb, Katja N. Hoehn

Publisher:Elaine N. Marieb, Katja N. Hoehn

Chapter1: The Human Body: An Orientation

Section: Chapter Questions

Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...

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1- Match these terms with the correct statement or definition fa Myelinated Sodium Unmyelinated Node of Ranvier Potassium proteins Saltatory conduction Action potential Summation Threshold Leak channels A) Bare area of a myelinated axon B) Can propagate without changing its magnitude C) Type of axon that lacks myelin sheath D) The concentration of this ion and negatively charged proteins is much greater inside the cell than outside E) The concentration of this ion is much greater outside the cell than inside F) Action potentials are conducted from one node of Ranvier to another G) An action potential occurs when a graded potential reaches this level H) Type of axon that is surrounded by extensions from oligodendrocytes or Schwann cells that wrap repeatedly around a segment of the axon I) Large, negatively charged, do not cross the plasma membrane J) Occurs when the effects of one graded potential are added onto the effects produced by another graded potential K) These channels are…
Neural pathway transmit impulses which terminate at what? a) motor cortex, b) somatosensory cortex, c) mechanoreceptors, d) thalamus, e) brainstem, f) skeletal muscle, g) cerebellum?
The process of myelination results in an increase in white matter. Myelination happens for all brain regions. Because of increases in myelination A) At the same time; neural signals can travel through the brain faster B) At different times; neural signals can travel through the brain faster C) At different times; neurogenesis is improved D) At the same time; neurogenesis is improved
The following image depicts the ____, which is responsible for _____. A) spinal nerves, spinal reflexes B) spinal cord, peripheral nervous system communication C) dorsal roots, sensory input D) ventral roots, motor commands to skeletal muscle
Left Right 21. Which of the following types of neurons are indicated by asterisks in the photograph of a cross section of the spinal cord? A) Postganglionic parasympathetic B) Postganglionic sympathetic C) Preganglionic parasympathetic D) Preganglionic sympathetic
3) which of the following is not a part of the peripheral nervous system, exclusively? a) sensory receptors b) cranial nerves c) spinal nerves d) cerebellum
20) which of the following is not a part of the central nervous system, exclusively? a) cerebellum b) medulla oblongata c) cranial nerves d) spinal cord
fill in the blank.......... is a reflection of the unequal distribution of positive and negative ions across the plasma membrane of the axons (axolemma)
9) the period after an initial stimulus when a neuron can not be sensitive to another stimulus is the ....? a) resting period b) relative refractory period c) depolarization d) absolute refractory period
The level of depolarization at which an action potential will be triggered is referred to as the Multiple Choice a) cationic potential. b) membrane potential. c) threshold potential. d) refractory potential. e) resting potential.
Chronic neuroinflammation may lead to cognitive impairment as a result of: a.) synaptic destabilization b.) reduced adult neurogenisis c.) nerve fiber demyelination d.) neuronal cell death e.) all the above
over a period of 3 years , a 40 year old man develops generalized dystonic , hyperkinetic movements and progressive dementia , his mother and one sister have a similar disease but his father and another sister are healthy. which of the following lesions is mostly likely to be present in the cerebral nervous system of the patient and his affected family members. A) atrophy of the caudate nuclei, B) loss of pigmented cells in the sustengria nigra, C) microglial nodules and multinucleated giant cells in the white matter, D) neurofibrillary tangles in the cortical neurons, E) spongiform changes in the cerebral cortex