Capillary walls are only one cell thick, so oxygen can pass out of the blood, and waste material can pass into the blood.

The use of fee-for-service reimbursement

a. has been eliminated b. has been greatly reduced c. has been increased d. has not been affected by innovative methods

The caries process demineralizes tooth structures, allowing _____ x-rays to pass through the tooth and _______ the image receptor

a. more, lighten b. more, darken c. less, lighten d. less, darken