Examlex
__________ stresses the fact that mate selection is nonrandom.
Neurotransmitters
Chemical messengers that transmit signals across a chemical synapse, from one neuron (nerve cell) to another target neuron, muscle cell, or gland cell.
Enzymes
Biological molecules that significantly speed up the rate of virtually all of the chemical reactions that take place within cells.
Hormones
Chemical messengers produced by the endocrine glands in the body, which travel through the bloodstream to target organs to regulate physiology and behavior.
Myelin sheath
A fatty layer that encases the axons of some neurons, which helps increase the speed at which information can travel along the nerve cells.
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