Answer:
The correct answer is A.
Explanation:
An osteoclast is large multinucleated cell present in the bone. Its main function is bone resorption, which occur when the osteoclasts secret hydrogen ions and many enzymes. As a result, bone matrix is digested by them. The most important enzyme is the protease cathepsin K, which degrades collagen.
Cathepsin K is regulated by parathormone, calcitonin and growth factor interleukin 6.
Matrix digestion is key during <u>bone fractures</u>, because it allows the repair and remodeling of the bone. But when this action is excessive, it can lead to osteoporosis (loss of bone density).
Prolonged exposure to above-normal oxygen partial pressures, or shorter exposures to very high partial pressures, can cause oxidative damage to cell membranes, collapse of the alveoli in the lungs, retinal detachment, and seizures.
Answer:
curdling of milk is a chemical change.
Explanation:
because it formed by a chemical process of fermentation. moreover, a chemical change is a change that can't be reversed. This process can't be reversed as well so it's a chemical change
Play in dogs starts usually by putting up a play face or a
play bow with their butt waggling in the air. This behaviour is often called
metasignal. It means that dogs tell something important like wanting to play
with their fellow dogs.