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PSY 427 Chapter 1
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active transport : A protein-mediated process that expends energy to enable a molecule to cross a membrane
astrocytes : Star-shaped glia that synchronize the activity of the axons
cell body : Structure containing the nucleus, ribosomes, and mitochondria
dendritic spines : Short outgrowths that increase the surface area available for synapses
glia : Type of cell in the nervous system that, in contrast to neurons, does not conduct impulses over long distances
interneuron : Neuron whose axons and dendrites are all confined within a given structure
membrane : Structure that separates the inside of the cell from the outside environment
nucleus : Structure that contains the chromosomes
nodes of Ranvier : Interruptions in the myelin sheath of vertebrate axons
radial glia : Cells that guide the migration of neurons and the growth of axons and dendrites during embryological development
ribosomes : Sites for cell synthesization of new protein molecules
thiamine : A B1 vitamin necessary to use glucose
action potentials : Messages sent by axons
all or none law : Principle that the amplitude and velocity of an action potential are independent of the stimulus that initiated it
depolarize : To reduce polarization toward zero across a membrane
hyperpolarization : Increased polarization across a membrane
local neurons : Neurons without an axon
polarization : Difference in electrical charges between the inside and outside of the cell
resting potential : Condition of a neuron’s membrane when it has not been stimulated or inhibited
saltatory conduction : The jumping of action potentials from node to node
selectively permeable : Ability of some chemicals to pass more freely than others through a membrane
threshold : Minimum amount of membrane depolarization necessary to trigger an action potential
myelinated axons : Axons covered with myelin sheaths
voltage gated channels : Membrane channels whose permeability to sodium or some other ion depend on the voltage difference across the membrane
PSY 427 Chapter 1
Across:2. | A protein-mediated process that expends energy to enable a molecule to cross a membrane | 3. | Condition of a neuron’s membrane when it has not been stimulated or inhibited | 6. | Structure that contains the chromosomes | 7. | Principle that the amplitude and velocity of an action potential are independent of the stimulus that initiated it | 8. | Neuron whose axons and dendrites are all confined within a given structure | 9. | Neurons without an axon | 10. | Type of cell in the nervous system that, in contrast to neurons, does not conduct impulses over long distances | 13. | Structure that separates the inside of the cell from the outside environment | 14. | Difference in electrical charges between the inside and outside of the cell | 15. | Star-shaped glia that synchronize the activity of the axons | 16. | Minimum amount of membrane depolarization necessary to trigger an action potential |
| | Down:1. | Increased polarization across a membrane | 2. | Messages sent by axons | 4. | Interruptions in the myelin sheath of vertebrate axons | 5. | Axons covered with myelin sheaths | 11. | To reduce polarization toward zero across a membrane | 12. | Structure containing the nucleus, ribosomes, and mitochondria |
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© 2016
PuzzleFast.com, Noncommercial Use Only
PSY 427 Chapter 1
Across:2. | A protein-mediated process that expends energy to enable a molecule to cross a membrane | 3. | Condition of a neuron’s membrane when it has not been stimulated or inhibited | 6. | Structure that contains the chromosomes | 7. | Principle that the amplitude and velocity of an action potential are independent of the stimulus that initiated it | 8. | Neuron whose axons and dendrites are all confined within a given structure | 9. | Neurons without an axon | 10. | Type of cell in the nervous system that, in contrast to neurons, does not conduct impulses over long distances | 13. | Structure that separates the inside of the cell from the outside environment | 14. | Difference in electrical charges between the inside and outside of the cell | 15. | Star-shaped glia that synchronize the activity of the axons | 16. | Minimum amount of membrane depolarization necessary to trigger an action potential |
| | Down:1. | Increased polarization across a membrane | 2. | Messages sent by axons | 4. | Interruptions in the myelin sheath of vertebrate axons | 5. | Axons covered with myelin sheaths | 11. | To reduce polarization toward zero across a membrane | 12. | Structure containing the nucleus, ribosomes, and mitochondria |
| |
© 2016
PuzzleFast.com, Noncommercial Use Only