A student in Trinidad studying for her CSEC examinations examines a cross-section of a long bone under a microscope. She observes a hard, dense outer layer surrounding a lighter, sponge-like inner region. Which of the following correctly identifies BOTH layers?

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Question

A student in Trinidad studying for her CSEC examinations examines a cross-section of a long bone under a microscope. She observes a hard, dense outer layer surrounding a lighter, sponge-like inner region. Which of the following correctly identifies BOTH layers?

Accepted Answer

Outer layer: compact bone; inner layer: spongy bone — Award 1 mark for correctly identifying compact bone as the dense outer layer AND spongy bone as the lighter, lattice-like inner layer. Compact bone is dense, with few spaces, providing strength, while spongy bone has a honeycomb-like network that reduces mass and houses red bone marrow in its spaces. B is incorrect because spongy bone is found internally, not on the outer surface — confusing the positions of the two types is a documented misconception. C confuses cartilage with compact bone; cartilage covers the articulating surfaces at the ends of bones (articular cartilage) but does not form the dense outer shaft. D is incorrect because although bone marrow fills the medullary cavity, spongy bone is also present in the inner region and must be identified — the option omits spongy bone entirely.

Answer

Outer layer: cartilage; inner layer: compact bone

Answer

Outer layer: spongy bone; inner layer: compact bone

Answer

Outer layer: compact bone; inner layer: spongy bone

Answer

Outer layer: compact bone; inner layer: bone marrow only

One real Human and Social Biology question.No signup. 30 seconds.

One real Human and Social Biology question.
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