5. Stimulus: Detectable change in the environment Sensor : Structures that can detect change Nerve impulse : Electrochemical signal. Effector : Muscle or gland. Response : Change in that gland or muscle .
9. The Brain Cerebrum: The “thinking” part; memory and cognition. Cerebellum Balance and coordination Medulla: Involuntary activity (heart rate, breathing) Corpus Callosum Connects left and right brain hemispheres The Brain and Spinal cord make up the Central Nervous System.