How extensive is the conscious control of the human body's organs?
I'm sure this one has been asked plenty of times, but I'm just curious. For example, I can control my heart rate with a variance of 65 bpm (50-115 bpm), blood oxygen by 10%, and for whatever reason, my limbs have exceedingly unusual flexibility which I have full control over. I was curious how much control we consciously have over other organs, like our intestines, skin, etc.