Exam 24: The Nervous System and the Senses

A mutant fruit fly with poor nerve transmission proves to have poor reception of signals sent by one neuron to another.This is probably due to mutated dendrite formation.

The layer of the wall of the eye that contains blood vessels that supply nutrients to the sheet of photoreceptors at the back of the eye and becomes the iris at the front of the eye is the

At the snail-shaped ________ of the inner ear,sound is transduced into nerve impulses.

Working with a patient with eye problems,you discover that the patient cannot focus images.You suspect that there may be a defect in the 

If you wanted to disrupt transmission of nervous signals from the brain to skeletal muscles,you could use a drug to destroy interneurons.

The part of the neuron that is usually a single long extension that conducts an impulse to a muscle or another neuron is the

A motor neuron's ________ and ________ reside in the central nervous system,but its ________ extend(s)into the peripheral nervous system.

Tetrodotoxin is a heat-stable molecule produced by puffer fish that blocks the entry of sodium ions into neurons. About 10-45 minutes after ingestion of tetrodotoxin, tingling of the tongue and inner surface of the mouth begins. An ascending paralysis develops, and death can occur within 6-24 hours, after respiratory muscle paralysis. -Why would this lead to paralysis and death?

The condition that develops when GABA levels in the brain are deficient is

A nerve impulse travels about ________ times faster when it leaps between gaps in the myelin sheath than when it travels along an unmyelinated axon.

The condition that develops when dopamine levels in the brain are deficient is

When a snake flicks its tongue,the tips of the forked tongue pass through openings in the palate and contact sensory cells in the snout.How would this help a snake detect its prey?

You are lying on a sand dune looking over the water, listening to the waves, and enjoying the feel of the sun and wind on your skin. You also smell the salty ocean air and seaweed that has washed ashore. -When you feel the sun on your skin,what is being activated?

The three types of neurons in the nervous system of humans are

An atom or molecule with an electrical charge is a(n)

-The diagram shows a

The type of neuron that brings information toward the central nervous system is the

In humans,which type of receptor is used primarily to detect light?

If a neuron is at rest,the concentration of potassium ions is greatest outside the cell and the concentration of sodium ions is greatest inside the cell.

The opening for light to enter into the eye is the