Did kidneys are organs in the human body that have multiple functions one critical function is to maintain the ph of blood at a precise level what biological process involves the maintenance of a constant internal environment

There are so many examples for that in different areas, like biology experiment carried out in our lab recently.

Here's one link:https://www.creative-biogene.com/support/Baculovirus-Efficient-Tool-for-Protein-Expression.html

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when you breathe in, or inhale, your diaphragm contracts (tightens) and moves downward. this increases the space in your chest cavity, into which your lungs expand. the intercostal muscles between your ribs also enlarge the chest cavity. they contract to pull your rib cage both upward and outward when you inhale.