Exam 6: The Peripheral Nervous System - Afferent Division - Special Senses

How many tactile mechanoreceptors are estimated to be in a typical fingertip?

CNS adaptation is specific for a particular odor,and responsiveness to other odors remains unchanged.

Nociceptors are sensitive to ____.

Pathways conveying conscious somatic sensation are called ____________________ pathways and they consist of discrete chains of neurons,or ____________________ lines.

What compound greatly sensitizes all nociceptors to noxious stimuli?

Like photoreceptors,hair cells do not undergo action potentials.

____________________ is the process of converting light stimuli into electrical signals.

What are rapidly adapting receptors called?

What taste sensation is elicited by the most chemically diverse group of tastants?

What happens when the radial muscle of the eye contracts or shortens?

Besides receptor density,a second factor influencing acuity is ____________________ inhibition.

What are the cells called within the glomeruli of the olfactory bulbs?

Convex surfaces converge light rays,bringing them closer together.

The larger posterior cavity between the lens and the retina contains a clear,jellylike substance,the vitreous humor.

The pea-sized area immediately surrounding the fovea is called the ____________________ which has a high concentration of cones and fairly high acuity.

Photoreceptors called ____________________ are responsible for night vision.

The strength of the lens depends on its shape,which in turn is regulated by the ciliary muscle.

The smaller the receptive field is in a region,the greater its ____________________or discriminative ability.

Perception of pain occurs in the thalamus.

What do pheromones influence in animals and likely people?