Chapter 13 PNS Practice Test

Fast adapting fibers are called __________. A. Threshold receptors B. Phasic receptors C. Tonic receptors D. Sensory receptors

B. Phasic receptors

Which of the following structures is involved in the projection level of motor control? A. Cerebral basal nuclei B. Primary motor cortex C. Cerebellum D. Spinal cord

B. Primary motor cortex

The lowest level of motor control is the _______. A. Upper motor level B. Segmental level C. Projection level D. Precommand level

B. Segmental level

Most central nervous system axons are able to regenerate following injury. T/F

False

All spinal nerves are mixed nerves. T/F

True

Most nerves are able to transmit impulses both to AND from the central nervous system. T/F

True

The pinching motion (with opposed thumb and forefinger) is highly dependent upon impulses transmitted by the _________. A. Median nerve B. Musculocutaneous nerve C. Axillary nerve D. Ulnar nerve

A. Median nerve

In a reflex arc, the ___________ transmits afferent impulses to the central nervous system. A. Sensory neuron B. Integration center C. Effector D. Receptor

A. Sensory neuron

Proprioceptor's advise the brain of___________. A. Chemical imbalances B. Body movements C. Pain localization D. Temperature of the skin

B. Body movements

If the phrenic nerve were severed, what would be the most IMMEDIATE response? A. The sense of smell would be blocked B. Breathing would stop C. The upper limbs would be paralyzed D. The ability to swallow would be blocked

B. Breathing would stop

Which of the following statements about cranial nerves is FALSE? A. In most cases cranial nerves are named for the structures they serve or for their functions B. The cranial nerves are limited to the head and neck region C. Most cranial nerves serve structures in the head and neck D. There are 12 pairs of cranial nerves

B. The cranial nerves are limited to the head and neck region

Which is the following is FALSE regarding the sciatic nerve? A. The sciatic nerve is the largest branch of the sacral plexus B. The sciatic nerve is a single nerve C. Sciatic nerve is the thickest and longest nerve in the body D. The sciatic nerve supplies the entire lower limb except the anteromedial thigh

B. The sciatic nerve is a single nerve

The final level of neural integration in the somatosensory system is the ___________ level. A. Receptor B. Abstraction C. Perceptual D. Circuit

C. Perceptual

A nerve that carries autonomic signals away from the central nervous system is classified as a _______. A. Somatic afferent B. Visceral afferent C. Visceral efferent D. Somatic efferent

C. Visceral efferent

Which of the following structures is NOT a part of the peripheral nervous system? A. Motor endings B. Sensory receptors C. Ganglia D. Brain

D. Brain

The first two pairs of cranial nerves attach to the ______. A. Medulla oblongata B. Brain stem C. Spinal cord D. Forebrain

D. Forebrain

Which of the following have noncapsulated (free) nerve endings? A. Lamellar (Pacinian) corpuscles B. Tactile (Meissners) corpuscles C. Muscle spindLes D. Hair follicle receptors

D. Hair follicle receptors

Simple receptors that are particularly abundant in epithelia and connective tissue tend to ___________. A. Be mechanoreceptors B. Only have encapsulated nerve ending C. Be sense organs D. Have noncapsulated (free) nerve endings

D. Have noncapsulated (free) nerve endings

Choose the true statement. A. The knee jerk reflex is in example of a superficial reflex B. Stretch reflexes are hyperactive in comatose patients C. The abdominal reflex is an example of a tendon reflex D. The flexor reflex is initiated by painful stimuli

D. The flexor reflex is initiated by painful stimuli