What is the basic unit of structure and function in the nervous system?

Answer 1

Vitreous Humor: fluid that fills the large central chamber of the eye. It helps focus light onto the retina.

. Retina: The inner most layer of the eyeball. It contains photoreceptor cells that transmit signals from the optic disc to the optic nerve.

Rods and Cones: Rods are sensitive to light but do not distinguish colors, where as cones are responsible for daytime color vision.

. Optic nerve: Nerve that connects the eye to the brain.

Blind spot: Area of the eye that does not contain any rod or cones. It is here that the eye is attached to the optic nerve.

Fovea: Area of the retina that contains the highest concentration of cones. Does not contain any rods.

Ear: Parts of the ear:

. Pinna: The ear lobe which functions as a sound gatherer.

. Outer ear (canal): A canal that connects the outer ear with the ear drum (tympanic membrane).

Tympanic membrane: A thin piece of tissue that blocks off the outer and middle ear. It transmits sound waves to the three tiny bones of just behind it.

Hammer, anvil, and stirrup( middle ear): The three bones of the middle ear. They vibrate sending the impulses to the oval window of the cochlea.

Semicircular canals ( inner ear): Located in the inner ear and used in the sense of balance. The fluid in the canals move to notify the brain of any problems with the organisms balance.

. Cochlea: A coiled structure located in the middle ear containing tiny hairs that change sound waves into nerve impulses.

Auditory Nerve: Connects the ear with the brain

Answer 2

THE NERVOUS SYSTEM is the most complicated and highly organized of the various systems which make up the human body. It is the mechanism concerned with the correlation and integration of various bodily processes and the reactions and adjustments of the organism to its environment. In addition the cerebral cortex is concerned with conscious life. It may be divided into two parts, central and peripheral.

Answer 3

brain-receives messages and processes the message and sends its own message to the part of your body that is needed

spinal cord-it is th passage way of the message

nerves-it reseives messages from the senses

Answer 4

it tells you what to do, it send messages from your brain to you body parts telling them what to do

Answer 5

The brain shaped like a ball then the spine is shaped like a stick then you have all of the nerves. Because structure is how it is shaped.

Answer 6

Collects information about body's internal, external environment

Answer 7

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Answer 8

It's a neuron.