When the brain receives the message that the environment around the body is very cold, the temperature signal begins in neurons of the somatic nervous system. sensory nervous system. autonomic nervous system. central nervous system.

Investigator a has biological specimens that are coded and linked to identifiers of the source individuals. investigator a provides the specimens to investigator b but does not provide the individual identifiers. investigator b agrees not to re-identify the source individuals. is investigator b's research using the biospecimens human subjects research according to the definition of human subjects research in the federal regulations?