centrioles
Envelope
The component that determines the response to a stimulus in a reflex arc is the interneuron. This neuron receives the sensory input from the sensory neuron, processes the information, and then sends signals to initiate the appropriate motor response via the motor neuron.
Axon/Axon terminals
Fluoride is a natural component in some waters and absent in others.
Lucidum
Lucidum
centrioles
cell body
Yes, the axon conducts the action potential from the cell body to the effector organ.
Lucidum
No, it is not used as a preposition. It is usually an adjective (missing, not present), but more rarely as a verb (e.g. to absent oneself).
Usually by age 12 they can effectively understand the situation and give their own opinion on whether or not to see their absent parent.