Physiology 1A exam 4

Which of these is true about action potentials?

• The more depolarization, the bigger the action potential

• EPSPs can summate to produce action potentials

• Conduction velocity decreases with myelin

• The refractory period increases the firing rate of an action potential

Which of these papillae categories does not contain taste buds?

• Vallate

• Filiform

• Fungiform

• Foliate

THe frequency of a perceived sound depends on what?

• Number of hair cells stimulated

• Movement of perilymph in the cochlear duct

• Which part of the cochlear duct is stimulated

• The frequency of vibration of the tectorial membrane

Which of these is true of astrocytes?

• Myelinate PNS axons

• Are involved in brain immune function

• Myelinate CNS axons

• Provide physical support to neurons

The auditory ossicles connect what?

• Vestibular window to the cochlear window

• Stapedius to the tympanic membrane

• Tympanic membrane to the cochlear window

• Tympanic membrane to the vestibular window

Where do the olfactory nerves terminate ?

(a)  

Which of these would you expect to find outside of a cell at resting membrane potential?

• K+

• Na+

• Cl-

• Ca2+

The vibrations received by the tympanic membrane are transferred to the vestibular window by what?

• Stapedius muscle

• Cochlea

• Auditory ossicles

• Tensor tympani

Taste buds are supplied by what cranial nerves ?

• VII, IX, X

• VII, VIII, IX

• IX, X, XI

• V, VII, IX

Which neuroglia is responsible for forming the myelin sheath around axons in the peripheral nervous system?

• Microglia

• Astrocytes

• Schwann Cells

• Oligodendrocytes