Across
- 7. It consists of two parts: the brain and the spinal cord. The brain is the center of our thoughts
- 9. to fight or to run away—the sympathetic system causes divergent effects as many different effector organs are activated together for a common purpose.
Down
- 1. They enable the brain to provide a variety of functions, through the process of chemical synaptic transmission
- 2. the process whereby organisms better adapted to their environment tend to survive and produce more offspring
- 3. is the material that holds genes
- 4. relating to or denoting heritable characteristics controlled by genes that are expressed in offspring only when inherited from both parents,
- 5. 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.
- 6. the cells responsible for receiving sensory input from the external world, for sending motor commands to our muscles,
- 8. a unit of heredity which is transferred from a parent to offspring and is held to determine some characteristic of the offspring.