What prevents oxygen-rich blood from mixing with oxygen-poor blood in the heart?

A) The tricuspid valve
B) The fibrous pericardium
C) The aortic and pulmonary semilunar valves
D) The interatrial and interventricular septa
E) The intercalated discs

Glaucoma is a state of elevated pressure within the eye that occurs when the ________ is obstructed so the aqueous humor is not reabsorbed as fast as it is secreted.

A) scleral venous sinus
B) posterior chamber
C) anterior chamber
D) lacrimal punctum
E) tarsal gland opening