Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
20 Cards in this Set
- Front
- Back
PNS Rohan |
Peripheral Nervous System Part of the nervous system that consists of the nerves and ganglia on the outside of the brain and spinal cord |
|
Neurons Rohan |
A specialized cell transmitting nerve impulses |
|
Impulse Rohan |
A nerve impulse is the way nerve cells (neurons) communicate with one another. |
|
Axon Rohan |
A long, slender projection of a nerve cell, or neuron, that typically conducts electrical impulses away from the neuron's cell body. |
|
Axon Terminal Rohan |
Axon terminals are separated from neighboring neurons by a small gap called a synapse, across which impulses are sent. |
|
Dendrites Rohan |
A short branched extension of a nerve cell, along which impulses received from other cells at synapses are transmitted to the cell body. |
|
Nerves Rohan |
(In the body) a whitish fiber or bundle of fibers that transmits impulses of sensation to the brain or spinal cord, and impulses from these to the muscles and organs |
|
Sensory Neurons Rohan |
Sensory neurons are nerve cells within the nervous system responsible for converting external stimuli from the organism's environment into internal electrical impulses. |
|
Receptors Rohan |
An organ or cell able to respond to light, heat, or other external stimulus and transmit a signal to a sensory nerve. |
|
Motor Neurons Rohan |
A nerve cell forming part of a pathway along which impulses pass from the brain or spinal cord to a muscle or gland. |
|
CNS
Rohan |
The central nervous system (CNS) is one of the two major divisions of the nervous system. The other is the peripheral nervous system (PNS) which is outside the brain and spinal cord |
|
Brain
Rohan |
An organ of soft nervous tissue contained in the skull of vertebrates, functioning as the coordinating center of sensation and intellectual and nervous activity |
|
Cerebrum
Rohan |
The principal and most anterior part of the brain in vertebrates, located in the front area of the skull and consisting of two hemispheres, left and right, separated by a fissure. It is responsible for the integration of complex sensory and neural functions and the initiation and coordination of voluntary activity in the body |
|
Cerebellum
Rohan |
The part of the brain at the back of the skull in vertebrates. Its function is to coordinate and regulate muscular activity. |
|
Medulla
Rohan |
The part of the vertebrate brain that is continuous posteriorly with the spinal cord and that contains the centers controlling involuntary vital functions — see brain illustration. |
|
Reflex
Rohan |
An action that is performed as a response to a stimulus and without conscious thought |
|
Lens
Rohan |
By changing its shape, the lens changes the focal distance of the eye. In other words, it focuses the light rays that pass through it (and onto the retina) in order to create clear images of objects that are positioned at various distances. It also works together with the cornea to refract, or bend, light |
|
Photoreceptors
Rohan |
A structure in a living organism, especially a sensory cell or sense organ, that responds to light falling on it |
|
Neurotransmitter
Rohan |
A chemical substance that is released at the end of a nerve fiber by the arrival of a nerve impulse and, by diffusing across the synapse or junction, causes the transfer of the impulse to another nerve fiber, a muscle fiber, or some other structure. |
|
Synaptic gap
Rohan |
The minute space between the cell membrane of an axon terminal and of the target cell with which it synapses. Also called synaptic cleft |