★ Breathing System Quiz
What is the process by which oxygen passes from the alveoli into the blood vessels?
A. Diffusion
B. Respiration
C. Excretion
D. Gas exchange
Select your answer:
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Vision and Hearing Defects › ViewWhich of the following is NOT a factor in conductive hearing loss?
A. Obstruction in the ear canal.
B. Damage to the hair cells in the cochlea.
C. Fluid in the middle ear.
D. Perforation of the eardrum.
Skin Structure › View
What is the oily substance that hydrates the skin, prevents it from being dry and makes it waterproof?
A. sweat
B. cerumen
C. sebum
D. humus