The Respiratory System Doesn't Adapt, Is It?

When you just normally exercise, how is that system stressed? And does that produce an adaptation? Because you mention the meat heads an the gem, right? So i gong to use them as analogy, i'm go in the jem and i can do a munch of bicet curls and get bigger biceps. And can get biceps that function better. It can curl faster, i can curl more weight and all that other stuff. Its the respiratory system is inherently unmalleable. To adapt, you get a bigger cross sectional air o the muscle, or you get better recruitment muscle fibres. If you go out running or cycling, your cardio vascular system is quite