First class[change | change source] A first-class lever is a lever where the fulcrum is in between the effort and resistance (the load). Seesaws and crowbars are examples of first class levers. Second class[change | change source] A second-class lever is where the resistance is between the effort and the fulcrum.
This system contains the thalamus, hypothalamus, amygdala, and hippocampus. Brain Stem: Underneath the limbic system is the brain stem. This structure is responsible for basic vital life functions such as breathing, heartbeat, and blood pressure. Scientists say that this is the simplest part of human brains because animals' entire brains, such as reptiles (who appear early on the evolutionary scale) resemble our brain stem.
, studied at AB Psychology. The part of the brain for control of balance and coordination is cerebellum. The functions of cerebellum are regulation of motor movements. The cerebellum coordinates voluntary movements such as posture, balance, coordination, and speech, resulting in smooth and balanced muscular activity.