reflex arc Pathway of neurons, effector(s) and sensory receptors that participate in a reflex.
region of division The area of cell division in the tip of a plant root. PICTURE ...
Reflex arc involves spinal cord rather than brain (quicker action)
May involve brain
Control of muscles in iris
Tension in suspensory ligaments of eye ...
A reflex action or reflex is a biological control system linking stimulus to response and mediated by a reflex arc. Reflexes can be built-in or learnt.
The reflex arc is an automatic, involuntary reaction to a stimulus. When the doctor taps your knee with the rubber hammer, she/he is testing your reflex (or knee-jerk).
The reflex arc is completed by fibers in the superior peduncle which pass to the red nucleus and the thalamus and thence by additional neurons (rubrospinal tract) to the motor centers.
 See also: Class, Tissue, Trans, Neuron, Organ
  
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