Enkephalins produce presynaptic inhibition in neurons transmitting pain signals. Increased levels of enkephalins will
A. increase amount of pain.
B. decrease amount of pain.
C. increase awareness of pain.
D. decrease awareness of pain.
E. have no effect on awareness or amount of pain.
Answer: D
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Answer the following statements true (T) or false (F)
1. The bony cochlea coils around a central hub, which is called the spiral ganglion. 2. The hair cells of the cochlear duct are found in the modiolus. 3. The cochlear duct is separated from the tympanic duct by the basilar membrane. 4. The membrane attached to the inner wall of the cochlear duct that causes the stereocilia of the hair cells to distort when it bounces up and down is the tectorial membrane. 5. The cell bodies of the sensory neurons that monitor the receptors in the cochlear duct are contained in the spiral ganglion.
Wrapped around glomerular capillaries are cells with pedicels called __________.
Fill in the blank(s) with the appropriate word(s).
Conduction by local current flow
a. occurs in unmyelinated fibers. b. is faster than propagation of an action potential in myelinated fibers because myelin acts as an insulator to slow down the impulse. c. involves current flowing locally between the active and adjacent inactive areas, thereby bringing the inactive areas to threshold so that they too become active (i.e., have an action potential). d. both (a) and (c) above. e. all of these answers.
Arrange the following in correct sequence:
(1) protein moves through ER and then carried in vesicles to Golgi apparatus (2) vesicle pinches off from the Golgi apparatus and carries product to plasma membrane (3) Golgi apparatus modifies protein and then packages them into vesicles (4) protein made by ribosomes on rough ER A. 4, 3, 2, 1 B. 3, 2, 4, 1 C. 2, 3, 1, 4 D. 1, 2, 3, 4 E. 4, 1, 3, 2