Question Video: Distinguishing between Bone and Cartilage | Nagwa Question Video: Distinguishing between Bone and Cartilage | Nagwa

Question Video: Distinguishing between Bone and Cartilage Biology • Third Year of Secondary School

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Bones in the skeleton form from cartilage, and cartilage also makes up structures like the external ears and the nose. Which of the following is a correct difference between bone and cartilage? [A] Cartilage is a connective tissue, whereas bone is an epithelial tissue. [B] Cartilage is a hard tissue, whereas bone is a soft tissue. [C] Cartilage contains a network of capillaries, whereas bone contains a network of arterioles. [D] Cartilage does not contain blood vessels, whereas bone does.

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Video Transcript

Bones in the skeleton form from cartilage, and cartilage also makes up structures like the external ears and the nose. Which of the following is a correct difference between bone and cartilage? (A) Cartilage is a connective tissue, whereas bone is an epithelial tissue. (B) Cartilage is a hard tissue, whereas bone is a soft tissue. (C) Cartilage contains a network of capillaries, whereas bone contains a network of arterioles. Or (D) cartilage does not contain blood vessels, whereas bone does.

Bone and cartilage are both connective tissues, meaning they are made up of living cells and fibers suspended in a nonliving matrix. And they both play a role in the skeletal system, as mentioned in this question. Since we know that bone and cartilage are both connective tissues, we can eliminate (A). But what are some differences between bone and cartilage?

While both bone and cartilage are strong connective tissues, bone is strong and hard. Cartilage is more flexible and not quite as strong as bone. The bone in your elbow is certainly harder, for example, than the flexible cartilage in your ears and nose. Since we know that bone is harder than cartilage, we can eliminate (B).

One of the key differences between bone and cartilage is that bone contains blood vessels, and therefore its cells have a ready blood supply. Cartilage does not contain blood vessels. In fact, when bone is forming in areas of cartilage in an immature skeleton, one of the key changes during this process is that blood vessels grow into the area where bone will form. The lack of blood supply in cartilage is one reason why if it is damaged it heals very slowly. When a young child whose bones have not completely formed breaks an arm, it may take longer to heal for this reason. Since we know cartilage does not contain blood vessels, we can eliminate (C).

The correct answer is (D). A difference between bone and cartilage is that cartilage does not contain blood vessels, whereas bone does.

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