(Q001) Watch the animation "The Biomechanics of Bone" and answer the question that follows.
https://util.wwnorton.com/jwplayer?type=video&msrc=/wwnorton.college.protected/coursepacks/phys_anthro/animations/animation_biomechanics_of_bone.mp4&isrc=/wwnorton.college.protected/coursepacks/phys_anthro/animations/animation_biomechanics_of_bone.jpg&csrc=/wwnorton.college.protected/coursepacks/phys_anthro/animations/animation_biomechanics_of_bone.vtt&cp=1

Name the principle that asserts that bone mass is distributed where it is needed and removed where it is not.

Question

(Q001) Watch the animation "The Biomechanics of Bone" and answer the question that follows.
https://util.wwnorton.com/jwplayer?type=video&msrc=/wwnorton.college.protected/coursepacks/phys_anthro/animations/animation_biomechanics_of_bone.mp4&isrc=/wwnorton.college.protected/coursepacks/phys_anthro/animations/animation_biomechanics_of_bone.jpg&csrc=/wwnorton.college.protected/coursepacks/phys_anthro/animations/animation_biomechanics_of_bone.vtt&cp=1

Name the principle that asserts that bone mass is distributed where it is needed and removed where it is not.

BlackTom AI · Accepted Answer

The question asks us to identify the principle describing how bone mass adapts by aligning with functional demands. 
Option 1: 'Bergmann’s Rule' — This is a principle from ecological biology stating that populations of a species in colder climates tend to have larger body sizes to conserve heat. It does not address bone remodeling or mass distribution in response to mechanical use, so it is not the correct concept here.
Option 2: 'natural selection' — While natural selection explains how traits that aid survival can become more common over generations, it does not specifically describe the adaptive remodeling of bone within an individual's lifetime in response to mechanical stresses. Therefore, this option does not precisely capture the stated principle.
Option 3: 'Wolff’s Law' — This law posits that bone remodels in response to mechanical loads, increasing mass where stress is needed and reducing where it is not, effectively distributing bone mass according to functional demand. This directly matches the described principle about bone mass distribution.
Option 4: 'adaptation' — Broadly, adaptation refers to any trait that increases fitness in a given environment, and while bone remodeling can be considered an adaptive response, the phrasing of the question points to the specific mechanistic rule governing bone mass distribution, which is best captured by Wolff’s Law rather than the more general notion of adaptation.

ANTH-101-03 CH 13 ANIMATION EXERCISE: The Biomechanics of Bone

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