Most human axons have a myelin sheath that_____ . a. prevents action potentials from moving backward b. increases the speed of action potential conduction c. consists of specialized interneurons d. increases the size of action potentials
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Most human axons have a myelin sheath that_____ .
a. prevents action potentials from moving backward
b. increases the speed of action potential conduction
c. consists of specialized interneurons
d. increases the size of action potentials
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- When neuron is hyperpolarized,it____. A. becomes more sensitive to new stimuli B.becomes less sensitive to new stimuli C.responds as normal and is not affected at allNeurotransmitters are released by_____ . a. axon terminals c. dendrites b. a neuron cell body d. glial cellsWhen a neuron is at rest,_____ . a. it is at threshold potential b. voltage-gated sodium channels are open c. sodium–potassium pumps are operating d. it contains more sodium ions than the surrounding interstitial fluid
- An action potential begins when______ . a. a neuron reaches threshold potential b. voltage-gated potassium gates open c. voltage-gated sodium gates close d. sodium–potassium pumps stop operatingI. These forms the specialized junctions called synapse. A. Cell body B. Glial cells C. Synaptic terminal D. Neurotransmitters II. These are the gaps in the myelin sheath which is the site where signals are recharged as they travel down the axon. A. Neurotransmitters B. Axon hillock C. Dendrites D. Nodes of Ranvier III. These neurons form the local circuits that connect neurons in the brain A. Interneurons B. Axon hillock C. Dendrites D. SomaSchwann 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.
- Which of the following is true about the conduction of action potentials? a. Thicker axons are faster because there is more surface area on thicker axons. b. Myelin speeds conduction because the glial cells add voltage gated Na+ channels to the neuron. c. Diffusion of Na+ ions between the Nodes of Ranvier happens faster than the wave of opening and closing membrane proteins can travel. d. Neurons that don’t have myelin sheaths undergo saltatory conduction e. Action potentials move slowly.Skin 1 Spinal cord 4 3 2 A neuron was isolated from structure number 3 in the diagram above. When comparing the velocity of action potentials, structure numbered 3 is much slower than that of structure numbered 4. Which of the following explains why this is? Select one: a. Structure number 4 has a larger diameter than structure number 2. b. Structure number 4 does not have myelin sheaths. c. Structure number 3 does not have myelin sheaths. d. Structure number 3 has a larger diameter than structure number 4.Action potentials ____. Select one: A.can occur only once B.can move up or down an axon, away from or towards the cell body C.move in a one way direction towards the cell body D.move in a one way direction away from the cell body
- The membrane of a neuron is composed of __________ with __________ embedded in them. a. proteins; neurotransmitters b. lipids; proteins c. carbohydrates; purines d. benzene molecules; carbohydrates Which cell type sends out axons that become the optic nerve? a. bipolar b. ganglion c. horizontal d. amacrine1. Action potentials are generated in a region called the _______ which includes the axon hillock and the initial segment of the axon. 2.According to the all-or-nothing principle a.once the electrical impulse reaches a certain level of intensity (its threshold), it fires and moves all the way down the axon without losing any intensity. b.the amount of time a neuron must “rest” in between firing episodes is stable. c.as a person ages, his or her neurological system slows down and the intensity of neural impulses decreases significantly. d.if all the neurons in a network are not integrated, the “message” carried by the neurons will be lost.Match each type of neuroglial cell with its correct function._____ Schwann cells a. Phagocytic cells of the CNS_____ Ependymal cells b. Surround the cell bodies of_____ Microglial cells neurons in the PNS c. Create the myelin sheath in the PNS_____ Oligodendrocytes d. Anchor neurons and blood vessels, maintain extracellular nvironment around neurons, assist in repair of damaged brain tissue_____ Satellite cells e. Create the myelin sheath in the CNS_____ Astrocytes f. Ciliated cells in the CNS…