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Bone marrow is a major site of blood cell production.

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This photomicrograph of a Prussian blue stained bone marrow sample, revealed that there was normal amount of iron stores. Normal iron stores are seen as dark blue-stained material in the bone marrow.
Human Body

Inside bones

Bone marrow is a major site of blood cell production.

Red bone marrow produces new blood cells inside parts of the skeleton. This soft living tissue helps supply oxygen-carrying red cells, infection-fighting white cells, and the platelets involved in stopping bleeding.

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Human Skeleton on Exhibit at The Museum of Osteology, Oklahoma City, Oklahoma.
Human Body

300

Babies are born with about 300 bones, but adults have only 206.

Babies have more separate skeletal pieces than adults, often described as about 300 bones compared with the usual adult count of 206. The newborn number is approximate because developing bone and cartilage are not always counted the same way.

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zh:尖沙咀香港科學館2010年7月, zh:骨骼展覽
Human Body

1 cm

You are about a centimeter taller in the morning than at night.

People are usually slightly taller after a night lying down because spinal discs regain fluid when unloaded. Around a centimeter is a useful rough illustration, not a fixed daily change for everyone.

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