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ChanTiki Mcdougle 2
Week 7 study stack
| Question | Answer |
|---|---|
| Dendrites | Branchlike part of the neuron that transmits the nerve impulse toward the cell body. |
| Myelin sheath (myelin) | White fatty material that insulates the axon and speeds up nerve impulses. |
| Saltatory conduction | When the action jumps from one Node of Ranvier to the next. |
| Refractory period | An action potential cannot take place because the axon is busy and directs the action potential to continue down the axon. |
| Repolarization | Potassium is leaving the cell but leaves slowly |
| Depolarization | Sodium ions are flooding into the cell. |
| Polarization | The resting state of a neuron, the inside of the cell is more negative than the outside of the cell. |
| Action potential | Nerve impulse |
| Nerve impulses | Electrical signal from a neuron to another structure. |
| Nodes of Ranvier | Gaps between the myelin and is the only place that a nerve impulse can happen. |
| Oligodendrocytes | Produces myelin in the CNS, can produce enough myelin for 70 different axons |
| Axon terminals (synaptic knobs) | Ends of the axon that stores neurotransmitters. |
| A disease in which the immune system eats away at the protective covering of nerves | multiple sclerosis |
| interneurons | lie between motor and sensory neurons, 99% of body's neurons, most confined in CNS. shuttle cells within CNS |
| chemically gated channels | open when the appropriate chemical (in this case a neurotransmitter) binds |
| synapse | functional junction or point of close contact between two neurons or between a neuron and an effector cell |
| acetylcholine | chemical transmitter substance released by some nerve endings |
| This is the site of communication between neurons. | synapse |
| Mitochondria are particularly abundant here. | axon terminal |
| This tends to be the longest cytoplasmic projection froma neuron. | axon |
| This region of the neuron contains a single nucleus surrounded by cytoplasm. | cell body |
| This part of the neuron may have branching collaterals. | axon |
| This neuronal region transmits electrical impulses away from the cell body. | axon |
| The majority of neurons in the body are | multipolar |
| glial cells | |
| Which cells provide the myelin sheath for neurons in the CNS? | oligodendrocyctes |
| These glial cells surround the cell bodies of sensory neurons within ganglia of the PNS. | satellite cells |
| Action potentials travel along the | axon membrane |
| Which cells provide the myelin sheath for neurons in the PNS? | Schwann cells |
| Motor neurons arise primarily from the | basal plate |
| Which of the following most immediately encases the smallest component of a nerve? | fascicle |
| The chemical substance that is released at axon terminals is called a | neurotransmitter |
| White matter is white in color because of ________. | myelinated axons |
Created by:
Tikimcdougle