Which of the following is true?
A.Blood in the pulmonary veins is low in oxygen.
B.Blood in the pulmonary veins is high in carbon dioxide.
C.The oxygen concentration of inspired air is higher than that of alveolar air.
D.All of the choices are true.
Sensorineural deafness can be caused by all of the following except
A.excessively loud noises.
B.build up of wax in the ears.
C.damage to the cochlear nerve.
D.loss of hair cells in the cochlea.