Question

ответьте почему несмотря на то что рост кости в толщину осуществляется непрерывно за счет надкостницы, кость человека не становится массивнее.

Answer 1

После закрытия эпифизов трубчатых костей рост костей прекращается. а закрываются они под влиянием эстрогенов, вырабатываемых из мужского гормона тестостерона. сам тестостерон не влияет на вышеописанные процессы, только женский гормон эстроген. этим собственно и объясняется превышение среднего роста мужчин над женским...

Помоему вот так!)

Answer 2

Why doesn't the human bone become thicker despite continuous growth through periosteum?

The human bone does undergo continuous growth in thickness through the periosteum, but it does not become significantly thicker over time. This is because the growth of bone in thickness is balanced by the process of bone remodeling, which involves the removal of old bone tissue and the formation of new bone tissue. This remodeling process helps maintain the overall shape and structure of the bone without significant changes in thickness.

The periosteum is a thin layer of connective tissue that covers the outer surface of bones. It contains cells called osteoblasts, which are responsible for the formation of new bone tissue. These osteoblasts lay down new layers of bone on the outer surface of the bone, contributing to its growth in thickness.

However, at the same time, there are cells called osteoclasts that are responsible for the resorption or removal of old bone tissue. Osteoclasts break down and remove old bone tissue, allowing space for new bone tissue to be formed by osteoblasts. This process of bone remodeling helps maintain the balance between bone formation and bone resorption, preventing the bone from becoming excessively thick.

It's important to note that while the overall thickness of the bone may not change significantly, bone density can increase with age due to factors such as increased mineralization and the accumulation of bone mass during growth and development.

In summary, although the human bone undergoes continuous growth in thickness through the periosteum, the process of bone remodeling helps maintain the overall shape and structure of the bone without significant changes in thickness.