When sound waves enter the ear, they cause the eardrum to a.)vibrate b.)stimulate receptors cells c.)send messages to the brain d.) interrupt sounds

Is it considered muscles' ennervation if the sympathetic fibers innervate vessels within the muscle ? (vasomotricity)

How do the uv rays cause damage?   what exactly causes the skin to burn;   can you be more specific about this mechanism?   3. how do photosensitive medications increase a person's sensitivity to sunlight and therefore increase their risk of getting burned?     what kind of medications can increase photo-sensitivity, can you think of some examples?

How many teeth on primary dentition