Preganglionic nerve fibers (short) originate in the thoracic and lumbar regions of the spinal cord.
Reflex that prevents overstretching in the muscle. Monosynaptic.
an integral membrane protein that responds to the binding of acetylcholine, a neurotransmitter. examples: Nicotinic and Muscarinic
When binding neurotransmitters, these receptors activate a G-protein, which initiates a signaling cascade inside the cell by activating or inhibiting intracellular messengers.
Both sympathetic and parasympathetic preganglionic fibers release acetylcholine (ACh) that binds to _____ _____.
More complex learned motor responses that develop after birth.
Parasympathetic postganglionic fibers release ACh, which binds on the effector.
Detects changes in tension of muscle.
Preganglionic never fibers (long) originate from the cranial and sacral regions of the CNS.
A motor neuron carries the message from the central nervous system to the effector. ex. knee jerk
Cluster of neuronal cell bodies in the PNS.
Reflex causing one to move away quickly from a painful stimulus.
Most effector organs are innervated by both sympathetic and parasympathetic systems.
Down
Most sympathetic postganglionic fibers release norepinephrine (NE), which binds to_____ and _____ _____.
Intrafusal muscle fibers that monitor muscle length. Triggers stretch reflex.
Postural reflex
Modified sympathetic ganglion but does not give rise to postganglionic fibers. Norepinephrine (20%) and epinephrine (80%) are released into the bloodstream as hormones.
Occurs automatically without conscious effort.
WN
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