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chapter 5 essentials
| Question | Answer |
|---|---|
| peripheral nervous system | neurons outside the central nervous system |
| afferent (sensory) division | nerves that link sensory receptors with the CNS. |
| efferent, or motor, division | nerves that link the CNS to the effectors outside the CNS |
| somatic nervous system | nerves that act to keep the body in balance with its external environment by transmitting impulses between the CNS and the skeletal muscles and skin |
| autonomic nervous system connects the CNS to the glands, heart, and smooth muscles to maintain the internal body environment | connects the CNS to the glands, heart, and smooth muscles to maintain the internal body environment |
| sympathetic nervous system | functions when the body is under stress, producing fight-or-flight responses |
| parasympathetic nervous system | functions under normal body conditions and is the energy conservation and restorative system, associated with what commonly is called the relaxation response. |
| nerve | group of peripheral nerve fibers, or axons, wrapped together |
| cranial nerves | 12 pairs - originate from the olfactory bulbs, thalamus, visual cortex, and brainstem |
| spinal nerves | 31 pairs - originate in the spinal cord and emerge from the vertebral column. |
| Mixed nerves | make sensation and movement possible |
| plexus | network of intertwining nerves that innervates a particular region of the body |
| four nerve plexuses | cervical plexus, brachial plexus, lumbar plexus, sacral plexus. |
| dermatome | is a cutaneous (skin) section supplied by a single spinal nerve |
| myotome | skeletal muscle or group of muscles that receives motor axons from a given spinal nerve |
| Mechanical receptors | sensory receptors that detect changes in pressure, movement, or temperature or other mechanical forces |
| thermal receptors | sensory receptors that detect changes in temperature |
| Nociceptors | sensory receptors that detect painful stimuli |
| Propriceptors | sensory receptors that provide the body with information about position, movement, muscle tension, joint activity, and equilibrium |
| involuntary action | reflex in the physiological or functional unit of nerve function |
| stretch reflex | results when stretching of a muscle elicits a protective contraction of that same muscle |
| 4 BASIC SENSES | taste, smell, hearing, vision |