In the internal ear, perilymph is found in the:
1. utriculus
2. semicircular canals
3. scala media
4. scala vestibuli
Linear accelerations and head-tilts in the horizontal plane are detected by:
1. utricle
2. semicircular canals
3. organ of Corti
4. saccule
All the following statements regarding nerve impulse conduction are correct except:
1. Myelinated neurons have a higher conduction velocity than unmyelinated neurons.
2. Nerve impulses occur in an all-or-none manner.
3. The neuron cannot be stimulated during the depolarization phase.
4. The strength of impulses carried along a single nerve fiber can vary with the strength of their stimulus.
The organ converts one energy form into another would be called as:
1. effector
2. transducer
3. generator
4. receptor
The resting membrane potential is first established because of:
1. the movement of potassium ions down their electrical gradient through leak channels
2. the opening of voltage-gated sodium channels
3. the action of the Na+/K+ ATPase pump which transports positive ions in unequal numbers
4. the movement of sodium ions against their concentration gradient through leak channels
What is true for the events that occur during the generation of an action potential?
1. Potassium channels in the membrane open in response to depolarization
2. Sodium channels in the membrane open in response to neurotransmitter released from the adjacent membrane
3. The increase in sodium permeability in the membrane is an example of positive feedback
4. The movement of sodium into the neuron causes the cell to hyperpolarize
Threshold stimuli are those that are strong enough to:
1. Hyperpolarize the neuron membrane
2. Cause a net flux of negatively charged ions from inside to outside the cell
3. Cause a net flux of positively charged ions from outside to inside the cell
4. Close calcium channels to retain them in the cell
Identify the correct statement regarding the semicircular canals of the human internal ear:
1. There are three of them, all oriented in the same direction but sensitive to all possible head motions.
2. There are six of them, organized in three pairs with each pair sensitive to one kind of motion, such as up or down.
3. There are three stacked in a random fashion; all contributing to fluid flow through the utricle and saccule which interpret the direction of head movement from the resulting
fluid flow.
4. There are three oriented in different planes so that angular acceleration can be detected.
The sensory organ of hearing and the receptors are located in:
1. scala vestibuli
2. semicircular canal
3. scala tympani
4. cochlear duct
Static equilibrium is regulated by:
1. semicircular canals
2. vestibule
3. cochlea
4. None