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26 Cards in this Set
- Front
- Back
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3 Major Functions |
Gather Info Integrate and Analyse info Respond |
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Central Nervous System |
Brain and Spinal Cord Integrative and Control centres |
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Peripheral nervous system |
Cranial nerves and spinal nerves Communication lines between the CNS and rest of body |
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Sensory (afferent) nervous system |
Somatic and visceral sensory nerve fibres |
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Motor (efferent) division |
Motor nerve fibres Conducts impulses from the CNS to effectors (muscled/glands) |
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Somatic nervous system |
Voluntary motor Conducts impulses from receptors to the CNS |
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Automatic nervous system |
Visceral (involuntary) motor Conducts impulses from CNS to cardiac muscles Smooth muscles and glands |
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Sympathetic division |
Mobilises body systems during activity |
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Parasympathetic division |
Conserves energy Promotes house keeping functions during rest |
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Neurons |
Communicate by sending nerve impulses from one body part to another Extreme longevity Exceptionally high metabolic rate |
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Neurons are compromises of... |
Cell body Dendrites Axon |
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What does the cell body contain? |
Ribosomes Rough ER (Nissl bodies) Golgi apparatus Mitochondria |
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Where are neuron cell bodies located? |
Central Nervous System |
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Nuclei are? |
Clusters of cell bodies in the CNS |
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Ganglia are? |
Clusters of cell bodies along the nerves (PNS) |
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Dendrites process |
Short highly branched extensions Receptive region of the neuron Receives signals from other neurons or sensory receptors |
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Process of axon |
Generates and conducts nerve impulses away from cell body Begins at axon hillock |
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What is a long axon known as? |
Nerve fibre |
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What do axon terminals end in? |
Synaptic knobs containing neurotransmitters |
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What are neurotransmitters |
Chemicals that transmit the message from one neuron to the next cell |
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What happens when a neuron is stimulated? |
Electrical impulse is generated and conducted along the axon |
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What is synapse |
Functional junction between two neurons Neuron and a muscle or gland |
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Diffusion |
Released in synaptic deft and then diffuses away |
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Enzymatic degradation |
Broken down by enzymes |
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Reuptake |
Returned to pre-synaptic neuron for recycling |
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How many types of neuroglia are there? |
6. 2 in PNS 4 in CNS |
