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| 10076775734 | biological psychology | scientific study of the links between biological (genes, neural, hormonal) and psychological processes. |  | 0 |
| 10076775735 | neuron | a nerve cell; basic building block of the nervous system |  | 1 |
| 10076775736 | dendrites | part of the neuron that receives messages and conducts impulses toward the cell body. |  | 2 |
| 10076775737 | axon | the neuron extension that passes messages through its branches to other neurons or to muscles or glands. |  | 3 |
| 10076775738 | myelin sheath | a fatty tissue layer segmentally encasing the axons of some neurons; enables vastly greater transmission speed as neural impulses hop from one sausage-like node to the next. |  | 4 |
| 10076775739 | action potential | a neural impulse, a brief electrical charge that travels down an axon. | 5 | |
| 10076775740 | refractory period | a period of inactivity after a neuron fires. | 6 | |
| 10076775741 | threshold | the level of stimulation required to trigger a neural impulse | 7 | |
| 10076775742 | all-or-none response | a neuron's reaction of either firing (with a full strength response) or not firing. | 8 | |
| 10076775743 | synapse | the junction between the axon tip of the sending neuron and the dendrite or cell body of the receiving neuron. Tiny gap is known as the synaptic gap or synaptic cleft. |  | 9 |
| 10076775744 | neurotransmitters | chemical messengers that cross the synaptic gas between neurons. They travel across the synapse and bind to receptor sites on the receiving neuron, thereby influencing whether that neuron will generate a neural impulse. | 10 | |
| 10076775745 | reuptake | a neurotransmitter's reabsorption by the sending neuron. | 11 | |
| 10076775746 | endorphins | "morphine within" natural, opiate-like neurotransmitters linked to pain control and to pleasure. "runner's high" |  | 12 |
| 10076775747 | agonist | a molecule that, by binding to a receptor site, stimulates a response. | 13 | |
| 10076775748 | antagonist | a molecule that, by binding to a receptor site, inhibits or blocks a response. | 14 | |
| 10076775749 | nervous system | the body's speedy; electrochemical communication network, holds all the nerve cells of the peripheral and central nervous system. |  | 15 |
| 10076775750 | Central nervous system (CNS) | brain and spinal cord. |  | 16 |
| 10076775751 | peripheral nervous system (PNS) | the sensory and motor neurons that connect to CNS. | 17 | |
| 10076775752 | nerves | bundled axons that form neural "cables" connecting the CNS with the muscles, glands, & sense organs. | 18 | |
| 10076775753 | sensory (afferent) neurons | neurons that carry information from the sensory receptors to the brain and spinal cord. (takes info from outside world) |  | 19 |
| 10076775754 | motor (efferent) neurons | neurons that carry outgoing information from the brain and spinal cord to the muscles and glands. | | 20 |
| 10076775755 | interneurons | neurons within the brain and spinal cord that talk internally and intervene between the sensory inputs and motor outputs. |  | 21 |
| 10076775756 | somatic nervous system | the division of the PNS that controls the body's skeletal muscles. (what you are aware of. ex. moving your leg) | 22 | |
| 10076775757 | autonomic nervous system. (ANS) | part of the PNS that controls the glands and the muscles of the internal organs (such as the heart). (automatic, things you aren't aware of working like your heart or bladder.) Contains sympathetic and parsympathetic nervous systems. |  | 23 |
| 10076775758 | sympathetic nervous system | division of the ANS that arouses our body, getting us ready to react in stressful situations. |  | 24 |
| 10076775759 | parasympathetic nervous system | the division of the ANS that calms the body, conserving its energy. |  | 25 |
| 10076775760 | reflex | a simple, automatic response to a sensory stimulus, such as the knee-jerk response. |  | 26 |
| 10076775761 | endocrine system | a set of glands that secrete hormones into the bloodstream. |  | 27 |
| 10076775762 | hormones | chemical messengers that are manufactured by the endocrine glands travel through the bloodstream and affect other tissues. | 28 | |
| 10076775763 | adrenal glands | a pair of endocrine glands that sit just above the kidneys and secrete hormones (epinephrine and norepinephrine) that help the body respond in times of stress. |  | 29 |
| 10076775764 | pituitary gland | the endocrine system's most influential gland. Under the influence of the hypothalamus, it regulates growth and controls other endocrine glands. | 30 |
