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Chapter 2


The branch of science that deals with the biological basis of behavior and mental phenomena

Nervous System

The network of nerve cells and fibers that transmits nerve impulses between parts of the body.


Individual cells in the nervous system that receive, integrate, and transmit information.

Neural Impulses

messages that travel along neurons, electrochemical in nature


the gaps between adjacent neurons across which chemical signals are transmitted

Central Nervous System

brain and spinal cord

Peripheral Nervous System

Connects the central nervous system to the limbs and organs.

Endocrine System

the body's chemical communication system; a set of glands that secrete hormones into the bloodstream


A regulatory substance produced in an organism and transported in tissue fluids such as blood or sap to stimulate specific cells or tissues into action


the study of heredity and the variation of inherited characteristics.


a unit of heredity that is transferred from a parent to offspring and is held to determine some characteristic of the offspring


threadlike structures made of DNA molecules that contain the genes


a complex molecule containing the genetic information that makes up the chromosomes

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