A&P Mastering CH 13

Which of the receptor types might function as a nociceptor?

A) Nociceptors respond to potentially damaging stimuli like noxious chemicals and extremes of temperature or pH. Nociceptors are generally associated with free nerve endings of specialized neurons.

Identify the choroid.

B The choroid is the part of the vascular layer that lies posterior to the cornea's edge and under the sclera.

Which of the receptor types contributes to the sense of touch by responding to light pressure?

E) The tactile (Merkel) disc shown in E would be located in the base of the epidermis and would detect light touch.

Which layer of the eye is indicated by letter A?

Fibrous The fibrous layer includes the tough sclera (the "white" of the eye) as well as the transparent cornea.

Three main levels of neural integration operate in the somatosensory system. Which level involves the spinal cord?

circuit level Processing at the circuit level involves the transmission of action potentials along ascending pathways. These pathways deliver impulses to the appropriate regions of the cerebral cortex for localization and perception of the stimulus.

During close vision, what actions must the eye take to bring an object into focus?

contract the ciliary body

Use as refrence

http://www.easynotecards.com/print_list/63770

Which type of sensory receptor allows us to feel an insect landing on our skin?

mechanoreceptor Mechanoreceptors respond to mechanical force such as pressure, vibration, stretch, and touch, allowing us to feel an insect landing on our skin.

Which of the following is NOT used to classify sensory receptors?

the number of dendritic endings present

Identify the muscle responsible for depressing the eye and turning it laterally.

A This muscle's action is to depress the eye because of its upward pulling action and also to turn the eye laterally.

Identify the muscle that is controlled by the abducens nerve (CN VI).

B The lateral rectus muscle rotates the eye laterally, therefore "abducting" the field of vision. This is the only muscle innervated by the abducens nerve.

Which of the receptor types pictured functions exclusively as a proprioceptor?

B) Proprioceptors are sensitive to stimuli associated with body movements. The muscle spindle shown in B is responsive to muscle stretch.

Identify the layer that contains both a single-celled pigmented layer and a neural layer.

C The inner layer (retina) contains both the pigmented layer and the neural layer.

Which of these receptor types functions as an exteroceptor?

E) All of the structures illustrated are sensitive to stimuli arising outside the body.

The sensory division of the PNS is also known as the efferent division.

FALSE Afferent flows towards the CNS (Sensory). Efferent flows away from the CNS.

Sensory stimuli that activate receptors generate action potentials that are sent into the CNS

FALSE Sensory stimuli that activate receptors generate graded potentials in the receptor cell. These graded potentials ultimately pass the message on to a sensory neuron. If the graded potential is strong enough at the axon hillock it triggers an action potential that continues on to the CNS.

Name the muscle at D.

Inferior rectus The inferior rectus originates from the common tendinous ring at the back of the orbit and inserts into the inferior surface of the eye.

__________ are receptors that can respond to painful stimuli.

Nociceptors Respond to potentially damaging stimuli that result in pain.