The most important force causing net outward water flow across capillary walls is

A. Hydrostatic pressure of capillary blood: This pushes water out of capillaries into the interstitial space-it's the main driver of filtration at the arterial end of capillaries.
B. Osmotic pressure of plasma proteins: This pulls water back into capillaries, opposing outward flow.
C. Hydrostatic pressure of interstitial fluid: This would oppose outward filtration if significant, but it's usually low.
D. Intracellular hydrostatic pressure: This is not relevant to capillary filtration, which occurs between plasma and interstitial fluid.

A. Terminal sulcus: This is a V-shaped groove on the tongue that marks the division between the anterior and posterior tongue-not related to tongue mobility.
B. Lingual frenulum: This is a fold of mucous membrane under the tongue that may be too short or tight in some children (ankyloglossia or “tongue-tie”), limiting movement. Surgery may involve cutting this to free the tongue.
C. Uvula: The uvula is part of the soft palate and plays a role in speech and swallowing, not tongue movement.
D. Palatine tonsils: These are lymphatic tissues in the oropharynx and have no role in tongue movement.