Term
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Definition
| Characteristic of the nervous system, enabling it to transmit impulses. |
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Term
| Major Role of Nervous System |
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Definition
| Coordinate activity of all body systems in order to maintain homeostasis. |
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Term
| What makes up the Central Nervous System (CNS)? |
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Definition
| Brain(controls all body activities) and Spinal Cord(connects brain to PNS) |
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Term
| 2 Divisions of the Peripheral Nervous System |
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Definition
| Autonomic(Involuntary) and Somatic(Voluntary) |
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Term
| Autonomic Division of PNS |
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Definition
Sympathetic (Fight or flight; raises heart rate, blood pressure, and breathing rate).
Parasympathetic (Rest and digest;lowers heart rate, blood pressure, and breathing rate). |
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Term
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Definition
| Voluntary control of skeletal muscles. |
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Term
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Definition
| Transmit nerve impulses to other neurons or to muscles or glands. |
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Term
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Definition
| Short extensions off of cell body that connect to other neurons. |
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Term
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Definition
| Contains the nucleus, ribosomes, mitochondria, Golgi apparatus, Nissl bodies, and neurofibrils. |
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Term
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Definition
Nerve Fiber.
Long extension off of cell body. |
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Term
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Definition
Lack a myelin sheath and have a slower nerve conduction velocity.
Grey in color. |
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Term
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Definition
Outside layer.
White in color. |
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Term
| Myelin Sheath is produced by what in the CNS? |
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Definition
| Oligodendrocytes (can't regenerate) |
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Term
| Myelin Sheath is produced by what in the PNS? |
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Definition
| Schwann Cells (can regenerate) |
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Term
| Neurilemma (Neurilemmal Sheath) |
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Definition
Outside layer of myelinated fibers that allow Schwann cells to regenerate.
Only present in Schwann cells. |
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Term
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Definition
| Unmyelinated portion of a myelinated axon. |
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Term
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Definition
Only occurs with myelinated axons.
Action potential jumps from node to node along a myelinated axon. |
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Term
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Definition
1 Extension off of cell body.
Sensory: touch, sight, smell, hearing, pressure, pain. |
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Term
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Definition
2 Extensions off of cell body.
Specialized senses: hearing, sight, smell, taste |
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Term
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Definition
Multiple extensions off of cell body.
Motor Neurons: cause a change (muscles, organs, glands) |
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Term
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Definition
| Star-shaped cell that connects neurons to blood vessels, help metabolize glucose for neurons, form scar tissue after an injury to brain or spinal cord (ex:stroke). |
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Term
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Definition
| Phagocytosis of microbes and cell debris. |
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Term
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Definition
| Line ventricles of the brain and control the composition of spinal fluid. |
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Term
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Definition
| End of an axon from one neuron connects to dendrite or cell body of another neuron. |
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Term
| Where does nerve fiber regeneration occur and at what rate? |
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Definition
Peripheral Nervous System
4mm/day |
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Term
| Examples of Neurotransmitters and what they do. |
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Definition
Acetylcholine (muscles)
Epinephrine (increase heart rate)
Dopamine (Parkinson's Disease)
Serotonin (Related to depression[released and reused serotonin]) |
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Term
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Definition
| Substances found in the CNS that can alter or block a neuron's response to a neurotransmitter. |
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Term
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Definition
| Neurotransmitters for pain neurons. |
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Term
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Definition
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Term
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Definition
| Same as Enkephalins but stronger, more potent pain blockers. |
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