__________ referring to the tip, as in an apical pneumothorax, which is the accumulation of air or gas in the pleural cavity at the tip of the lung

?1-receptor stimulation

a. causes vasoconstriction. b. provides upper airway decongestion. c. increases heart rate and contractile force. d. relaxes bronchiole smooth muscle.

The high contrast between normal enamel and overlapped enamel can produce an optical illusion called "cervical burnout."

Indicate whether the statement is true or false