Spinal nerves exiting the cord from the level of L4 to S4 form the _________.
a. femoral plexus
b. lumbar plexus
c. thoracic plexus
d. sacral plexus
Which of the following is an incorrect statement regarding the occurrence of a sensation?
a. The stimulus energy must be converted into the energy of a graded potential called a transduction potential.
b. The stimulus energy must match the specificity of the receptor.
c. A generator potential in the associated sensory neuron must reach threshold.
d. The stimulus energy must occur within the receptor's receptive field
The stimulus energy must be converted into the energy of a graded potential called a transduction potential.
A fracture of the ethmoid bone could result in damage to which cranial nerve?
Striking the "funny bone" (ulnar nerve) may cause injury to a nerve of this plexus.
a. brachial plexus
b. sacral plexus
c. lumbar plexus
d. cervical plexus
In a crossed-extensor reflex, if the right arm was grabbed it would flex and the left arm would ________.
d. also flex
Select the correct definition.
a. Spatial discrimination allows us to recognize textures.
b. Pattern recognition allows us to see a familiar face.
c. Magnitude estimation is the simplest level of sensation.
d. Perceptual detection is the ability to detect how much stimulus is applied to the body.
Pattern recognition allows us to see a familiar face.
The patellar "knee jerk" reflex is an example of a/an _________.
a. extensor thrust reflex
b. crossed-extensor reflex
c. stretch reflex
d. stress reflex
If the ventral root of a spinal nerve were cut, what would be the result in the tissue or region that nerve supplies?
a. a complete loss of sensation and movement
b. loss of neither sensation nor movement but only of autonomic control
c. a complete loss of voluntary movement
d. complete loss of sensation
a complete loss of voluntary movement
Which of the following is not an example of an exteroceptor?
Choose one answer.
Transduction refers to conversion of ___________.
a. stimulus information to nerve impulses
b. receptor energy to stimulus energy
c. afferent impulses to efferent impulses
d. presynaptic nerve impulses to postsynaptic nerve impulses
stimulus information to nerve impulses