Vocabularies

__28.2__ (Rainy) Homeostasis: is the regulation and maintenance of the internal environment-temperature, fluids, salts, pH, nutrients, and gases-within the narrow ranges that support human life (Nowicki 858) Feedback: is the information from sensors that allows a control center to compare current conditions to a set of ideal values (Nowicki 859) Negative feedback: a control system counteracts any change in the body that moves conditions above or below a set point (Nowicki 860) Positive feedback: a control center uses information from sensors to increase the rate of the change away from the set points (Nowicki 861)
 * Vocabulary**

__29.1__ (Rainy) Stimulus: is the defined most broadly as something that causes a response (Nowicki 874) Nervous system: a physically connected network of cells, tissues, and organs that controls thoughts, movements, and simpler life processes (Nowickki 874) Central nervous system (CNS): includes the brain and spinal cord (Nowicki 875) Peripheral nervous system (PNS): is the network of nerves that transmits messages to the CNS and from the CNS to other organs in the body (Nowicki 875) Endocrine system: is a collection of physically disconnected organs that helps to control growth, development, and responses to your environment, such as body temperature (Nowicki 874)

__29.2__ (Rainy) Neuron: is a specialized cell that stores information and carries messages within the nervous system and between other body systems (Nowicki 876) Dendrite: are branchlike extensions of the cytoplasm and the cell membrane that receive messages from neighboring cells (Nowicki 876) Axon: is a long extension that carries electrical messages away from the cell body and passes them to other cells (Nowicki 876) Action potential: The stretching causes a change in charge distribution that triggers a moving electrical impulse (Nowicki 879) Terminal: the part of the axon through which the impulse leaves that neuron, contains chemical-filled vesicles (Nowicki 879) Neurotransmitter: are the chemical signals of the nervous system (Nowicki 879) Synapse: before and action potential moves into the next neuron, it crosses a tiny gap between the neurons (Nowicki 879) __29.4__ (Rainy) Cerebrum: is the part of the brain that interprets signals from your body and forms responses such as hunger, thirst, emotions, motion, and pain (Nowicki 886) Cerebellum: is the part of the brain that coordinates your movements (Nowicki 887) Reflex arc: are nerve pathways that need to cross only two synapse before producing a response (Nowicki 889) Somatic nervous system: is the division of the PNS that regulates all of the movement over which you have voluntary control (Nowicki 889) Autonomic nervous system: is the division of the PNS that controls automatic functions that you do not have to think about (Nowicki 890)