The body's coordinating centre for mechanical and chemical actions; made up of the brain and spinal cord.
What is the central nervous system.
100
The largest and most highly developed part of the human brain, which stores sensory information and initiates voluntary motor activities.
What is the cerebrum.
100
The outer covering of the eye that supports and protects the eye's layers.
What is the sclera.
100
The outer part of the ear that acts like a funnel, taking sound from a large area and channeling it into a small canal.
What is the pinna.
100
Chemicals released by cells that affects cells in other parts of the body.
What are hormones.
200
All parts of the nervous system, excluding the brain and spinal cord, that relay information between the central nervous system and other parts of the body.
What is the peripheral nervous system.
200
The outer layer of the cerebral hemispheres.
What is the cerebral cortex.
200
The transparent part of the sclera that protects the eye and refracts light toward the pupil of the eye.
What is the cornea.
200
A thin layer of tissue that receives sound vibrations.
What is the tympanic membrane.
200
Chemicals secreted by endocrine glands directly into the blood.
What are endocrine glands.
300
A nerve cell that conducts nerve impulses.
What is a neutron.
300
The nerve tract that connects the two cerebral hemisphere.
What is the corpus callosum.
300
The middle layer of tissues in the eye that contains blood vessels that nourish the retina.
What is the choroid layer.
300
An air-filled tube of the middle ear that equalizes pressure between the external and internal ear.
What is the Eustachian tube.
300
A hormone that is a produced in the adrenal medulla that accelerates heart rate and body reactions during a crisis.
What is epinephrine.
400
A projection of the cytoplasm that carries impulses toward the cell body.
What is a dendrite.
400
The area of the brain that processes information about smell; there is one bulb in each hemisphere.
What is the olfactory bulbs.
400
Photoreceptors that operate in dim light to detect light in black and white.
What are rods.
400
A coiled structure of the inner ear that responds to various sound waves and converts them into nerve impulses.
What is the cochlea.
500
A special type of glial cell that produces the myelin sheath.
What is a Schwann cell.
500
The region of the brain that acts as a relay station by sending nerve messages between the cerebrum and the medulla.
What is the pons.
500
The area at the centre of the retina where cones are the most dense and vision is sharpest.
What is the fovea centralis.
500
Any of the steroids produced by the adrenal cortex that help regulate electrolyte and water balance.