What is the structural unit of compact bone?

Choice A reason: "Osseosus" is not a recognized scientific law or principle. It appears to be a misspelling or fictional term.

Choice B reason: Dalton's Law pertains to the behavior of gases, specifically the partial pressures in a mixture. It has no relevance to bone remodeling.

Choice C reason: "Calcine's" is not a known law or principle in physiology or anatomy. It may be a misrepresentation or confusion with calcitonin, a hormone involved in calcium regulation.

Choice D reason: This is correct. Wolff's Law states that bone grows and remodels in response to the mechanical stresses placed upon it. This principle explains how bones adapt to increased load or disuse by altering their density and structure.

Choice E reason: Boyle's Law relates to the pressure and volume of gases in a closed system. It is unrelated to bone physiology.

Choice A reason: Myofilaments are the smallest contractile units within myofibrils, composed of actin and myosin. They do not represent bundles of muscle fibers.

Choice B reason: Fascicle is the correct term for a bundle of muscle fibers. Each fascicle is surrounded by perimysium and contains multiple muscle cells.

Choice C reason: Myofibrils are microscopic structures within individual muscle cells that contain the contractile machinery. They are not bundles of muscle fibers.

Choice D reason: Whole muscle refers to the entire organ composed of multiple fascicles, connective tissues, blood vessels, and nerves. It is a larger structure than a bundle of muscle fibers.