3318179
Description
Flashcards by Jlaal Mohammed, updated more than 1 year ago
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Created by Jlaal Mohammed
over 8 years ago
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| Question | Answer |
| reflex actions | enjoy!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! |
| what does reflexes mean? | an action that is performed without conscious thought as a response to a stimulus. |
| what does reflex arc mean? | the nerve pathway involved in a reflex action, including at its simplest a sensory nerve and a motor nerve with a synapse between. |
| what does synapses mean? | a junction between two nerve cells, consisting of a minute gap across which impulses pass by diffusion of a neurotransmitter. |
| what is a relay neurone? | An interneuron (also called relay neuron, association neuron, connector neuron or local circuit neuron) is one of the three classifications of neurons found in the human body. Interneurons create neural circuits, enabling communication between sensory or motor neurons and the central nervous system (CNS). |
| what is a sensory receptor? | In a sensory system, a sensory receptor is a sensory nerve ending that responds to a stimulus in the internal or external environment of an organism. In response to stimuli, the sensory receptor initiates sensory transduction by creating graded potentials or action potentials in the same cell or in an adjacent one. |
| what is a receptor site? | These receptor sites are actually proteins that are on the surface of each cell. They act as little receivers (or ears) that listen to the messages of the chemical messenger molecules as they float in the intercellular fluid surrounding every cell. |
| wha is the spinal cord? | the cylindrical bundle of nerve fibres and associated tissue which is enclosed in the spine and connects nearly all parts of the body to the brain, with which it forms the central nervous system. |
| what is white matter? | the paler tissue of the brain and spinal cord, consisting mainly of nerve fibres with their myelin sheaths. |
| what is grey matter? | the darker tissue of the brain and spinal cord, consisting mainly of nerve cell bodies and branching dendrites. |
| what are dendrites? | a short branched extension of a nerve cell, along which impulses received from other cells at synapses are transmitted to the cell body. |
| what is a spinal nerve? | A spinal nerve is a mixed nerve, which carries motor, sensory, and autonomic signals between the spinal cord and the body. In the human there are 31 pairs of spinal nerves, one on each side of the vertebral column. |
| what is the motor end plate? | . the large and complex end formation by which the axon of a motor neuron establishes synaptic contact with a skeletal muscle fiber (cell); several terminal branches of a motor axon end in irregular, club-shaped synaptic end formations, each of which is bedded in its own troughlike depression of the muscle fiber's surface; the postsynaptic membrane, the sarcolemma that forms the bottom of the trough, is greatly increased in surface area by deep infoldings protruding into the underlying cytoplasm of the muscle fiber; the subsynaptic interval between the plasma membrane of the axon terminals and the sarcolemma is filled with an amorphous substance; the trough is closed off toward the surface by the Schwann sheath, which peels away from the axons as the latter enter the trough and thus forms a lid over the trough; the slight bulge of this closure plate corresponds to Doyère eminence. |
| what is conscious? | aware of and responding to one's surroundings. |
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