Which condition is characterized by a lack of memory for events occurring after

Question

Which condition is characterized by a lack of memory for events occurring after a trauma or after a disease that initially led to loss of memory?     
      Narcolepsy
       Retrograde amnesia
       Sleep apnea
       Coma
       Anterograde amnesia
_________________________
Olfactory receptors are found:     

        A. throughout the entirety of the nasal cavity.
       B. only in the superior portion of the nasal cavity.
       C. on the tongue.
       D. from the vestibule to the pharynx.
       E. only in the inferior portion of the nasal cavity

_____________________________

Which of the following structures senses angular acceleration of the head in order to help maintain dynamic equilibrium?    
       A.Cochlea
       B. Semicircular canals
       C. Maculae of the vestibule
       D. Organ of Corti
       E. Vestibulocochlear nerve

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Explanation / Answer

1). Anterograde amnesia

Anterograde amnesia is characterized by a lack of memory for events occurring after a trauma or after a disease that initially led to loss of memory.

2). B. only in the superior portion of the nasal cavity.

Olfactory receptors (chemoreceptors) are found only in the superior portion of the nasal cavity.

3. B. Semicircular canals

The semicircular canals sense the angular momentum. When we change the position of head, the endolymph lags behind, and pushes the cupula forward, in the opposite direction of the angular movement. This result in the activation of hair cells, depolarisation of these cells sends signals to the vestibular division of the vestibulocochlear nerve (eighth cranial nerve) and thus transmits the equilibrium signals.

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