Which organ has several functions, including defense, hematopoiesis, red blood cell and platelet destruction, and blood reservoir?

A. inspiration occurs: Inspiration happens when intrapulmonary pressure is lower than atmospheric pressure, drawing air in.

B. expiration occurs: According to Boyle's Law, air moves from areas of high pressure to low pressure. If the pressure inside the lungs is higher than the outside air, air is forced out.

C. lung tissue has collapsed: A collapsed lung (pneumothorax) occurs when the pressure in the pleural space equals atmospheric pressure, not necessarily when lung pressure is higher.

D. the bronchioles are obstructed: Obstruction changes resistance to airflow, but the pressure gradient itself is what defines the phase of breathing.

A. oxidation-reduction: These enzymes (oxidoreductases) are involved in energy metabolism and electron transfer, not the breakdown of food.

B. hydrolyzing: Digestive enzymes are hydrolases; they use water to break chemical bonds (hydrolysis) in proteins, fats, and carbohydrates.

C. phosphorylating: These enzymes (kinases) add phosphate groups to molecules, usually for signaling or activation.

D. hydrase: This is a less specific/incorrect term in this context; "hydrolase" is the standard classification for digestive catalysts.