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Which of the following is a discrete quantitative (numerical) variable?
Sensory Nerves
Nerves that transmit sensory information from the body to the central nervous system, informing about external and internal environments.
Opiate Drugs
Substances derived from the opium poppy that are used for their pain-relieving properties but may lead to addiction.
Receptor Sites
Specific locations on the surface of a cell or within its interior where chemical compounds, such as hormones or neurotransmitters, can bind to trigger a response in the cell.
Endorphins
Neurochemicals produced in the brain that act as natural painkillers and are associated with feelings of pleasure and euphoria.
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