Depressants affect the central nervous system by: (A)Speeding up messages sent between brain cells
(B)Slowing down messages sent between brain cells
(C)Blocking receptor cites in the brain
(D)None of the above

The first muscles to develop in babies are those in the a. neck. b. trunk. c. arms. d. legs.

Diagram the passage of food through the digestive system. label the organs involved in digestion and absorption and identify the sites where carbohydrates, proteins, and fats are digested.

Which description best defines the nervous system and its two main branches? a: the message center of the body, split into the autonomic nervous system and the somatic nervous system b: the control panel of the body, split into the central nervous system and the exterior nervous system c: the message center of the body, split into the central nervous system and the peripheral nervous system d: the control panel of the body, split into the brain and the spinal cord