The white fatty substance present in the central nervous system (CNS) and peripheral nervous system (PNS) that serves to increase the speed of impulse conduction is called

myelin

Explanation:

Myelin insulates the axon which speeds up impulse conduction.

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the menstrual cycle – higher tier. negative feedback mechanisms affect the production of hormones in the menstrual cycle. oestrogen also stimulates the release of lh (luteinising hormone) from the pituitary gland, which in turn controls the production of progesterone.