| A | B |
| Avicenna | believed that humidity inside the head causes mood disorders, when breathing changes |
| William James | argued that scientific study of psychology should be grounded in biology |
| critical assumption | organisms share biological and behavioral similarities |
| nervous system | monitoring, regulating, and modulating the activities of all parts and organs of the body |
| neurons | basic units of the nervous system |
| cell body | contains the nucleus |
| axon | carries electrical impulses from the neuron |
| dendrites | receive information |
| synapses | tiny gap between neurons where information is passed |
| peripheral nervous system | includes the cranial nerves, spinal nerves, and autonomic nervous system |
| sympathetic nervous system | tends to ready the body for action |
| parasympathetic nervous system | tends to calm the body down |
| central nervous system | consists of the brain and spinal cord |
| cerebral hemispheres | dominate the human brain |
| cerebral cortex | responsible for higher-order functions such as vision, language, and memory |
| basal ganglia | regulate movement |
| limbic system | controls emotional behaviors |
| cerebellum | aids motor control |
| meninges | surround and protect the brain and spinal cord |
| blood-brain barrier | restricts the flow of molecules into the brain |