Nerves & Neurons
The long fiber of a neuron that transmits signals from the cell body to other nerve signals.
What is an axon?
The simplest type of nerve pathway, involved in a quick, automatic response to a stimulus, is _______.
What is the reflex arc?
The division of the nervous system that includes the cranial and spinal nerves.
What is the peripheral nervous system?
This form of defective vision is caused by an asymmetrically curved cornea.
What is an astigmatism?
The cell type that is responsible for color vision.
What is the cone?
The fibers of a neuron that carry information toward the cell body.
What are dendrites?
Any junction that allows an impulse to be transmitted from a nerve cell to another cell is a _______.
What is a synapse?
The protective layers of tissue that surround the brain and spinal cord.
What are meninges?
The inner layer of the eye that detects light and produces nerve impulses.
What is the retina?
The transparent front portion of the eye.
What is the cornea?
The neurons that relay messages between other neurons.
What are interneurons?
Myelin covered nerve fibers form ____ matter.
What is white matter?
The lowest part of the brain stem, which controls breathing and heartbeat.
What is the medulla oblongata?
The structure that produces tears.
What is the the lacrimal gland?
The sensory structures within the ear that contribute to balance.
What are semicircular canals?
The disease of the spinal cord caused by a virus that destroys motor neurons.
What is poliomyelitis?
Personality, judgement, self control, and voluntary movement of skeletal muscles are controlled by the _______ lobe of the brain.
What is the frontal lobe?
The part of the brain whose primary function is to coordinate skeletal muscle activity?
What is the cerebellum?
The region of the light sensitive layer of the eye that produces the clearest vision.
What is the fovea?
The snail-shaped structure of the inner ear that senses sound vibrations and generates nerve impulses is the __________.
What is the cochlea?
Neurons that carry information from the brain and spinal cord to the body parts are _______ neurons.
What are motor neurons?
This nerve carries sound impulses from the inner ear to the brain.
What is the auditory nerve?
The part of the brain that is primarily responsible for though, memory, voluntary actions, thinking, and intelligence.
What is the cerebrum?
The tough, white, outer layer of the eyeball.
What is the sclera?
Which portion of the eye is a camera's diaphragm?
What is the iris?