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Tour of the Human Body Systems

The Tour Starts Here!

The Immune System
The Nervous System
The Excretory System
The Respiratory System
The Circulatory Syatem
The Digestive System
The Skeletal System
The Muscular System
Glossary of Terms
The Nervous System Vocabulary

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Acetylcholine: Chemical neurotransmitter in the brain and PNS


Action Potential: a conducted change in the membrane potential of excitable cells, initiated by a change in the membrane permeable to sodium ions


Autonomic Nervous System: Centers, nuclei, tracts, ganglia, and nerves involved in the unconscious regulation of visceral functions.


Axon: Elongate extension of  a neuron that conducts an action potential.


Brain: The main neurological headquarters of the body


Cell Body: The main center of the cell


Central Nervous System: Acts as a control center for the nervous system; processes information, and provides short term control over activities of other systems


Cerebellum: Posterior portion of the metencephalon, containing the cerebral hemispheres, including the cerebral nuclei, and cerebral cortex.

Cerebrum- The largest portion of the brain, composed of the cerebral hemisphere; includes the cerebral cortex, the cerebral nuclei, and the 'white matter'


Dendrite: part of the neuron that receives incoming messages


Ganglia: A collection of nerve cell bodies


Medulla Oblongata: All communication between the brain and the spinal cord involves tracts the go through this area of the brain


Meninges: Three membranes that surround the surface of the CNS


Mixed Nerve: nerves that contains sensory and motor fibers


Motor nerve: These are messenger cells for the CNS

Nerve impulse:  An action potential in a neuron cell membrane


Neuron: A cell in neural tissue specialized for intercellular communication by (1) changes in membrane potential and (2) synaptic communication


Neurotransmitter: Chemical compound released by one neuron to affect the membrane potential of another cell


Parasympathetic Nervous System: a division of the Autonomic Nervous system that controls nerves that are responsible for activities that conserve energy energy and lower the metabolism


 Peripheral Nervous System: All communication between the body and the CNS occurs through the Peripheral N.S.


Reflex: A rapid, automatic response to a stimulus


Response: How a cell body reacts to a stimulus


Resting Potential: The membrane potential of a normal cell under ideal circumstances


Sensory Nerve: Conveys information from both the external and internal environments to other neurons inside the CNS.


Sodium-Potassium pump: This is a pump within individual cells that allows homeostasis within the cell by ejecting sodium ions and taking in Potassium ions


Spinal Cord: The spinal cord is the area of the body that receives messages from the brain and sends them throughout the body


Stimulus: A change in the environment that produces a change in cellular activities


Sympathetic Nervous System: The second division of the Autonomic N.S responsible for fight or flight responses primarily responsible with the elevation of the metabolic rate and increases alertness


Synapse: the part of the cell that allows it to communicate to other cells


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