Name the two collecting ducts that drain the lymphatic trunks.

A. Muscle contraction of upper airways: Upper airway muscle movement does not create the main pressure change driving inspiration
B. Partial pressure gradients for oxygen and carbon dioxide: Partial pressure gradients drive gas diffusion across membranes, not bulk airflow into lungs
C. Pressure gradient between atmosphere and alveoli: Contraction of the diaphragm/intercostals lowers intrapulmonary pressure relative to atmospheric pressure, causing air to flow in
D. Concentration gradients for oxygen and carbon dioxide: Concentration gradients drive diffusion at the alveolar–capillary level, not the gross movement of air into the lungs

A. In the mouth: little to no chemical digestion of nucleic acids occurs in the mouth.
B. In the small intestine: pancreatic nucleases (DNase, RNase) and brush-border enzymes in the small intestine chemically digest nucleic acids into nucleotides and bases.
C. In the large intestine: the large intestine is primarily for water absorption and microbial fermentation, not major nucleic acid digestion.
D. In the stomach: the stomach mainly digests proteins (pepsin) and does not significantly chemically digest nucleic acids.