My feet & ankles are swollen, hot and reddish color. I have high blood pressure, lupus, asthma, back problems, diabetic, fibromyalgia, and Padgett disease, an enlarged heart, and enlarged thymus gland.
1 Free T4 (Free Thyroxine) â considered a precursor hormone, T4 is converted to T3 as required by cells throughout the body; levels of T4 are generally much higher than T3.  Total T4 (Total Thyroxine) - Most T4 in the blood is bound to carrier proteins which make it biologically inactive. Total T4 includes unbound (free) T4 plus T4 that is bound to carrier proteins in the blood.
FAD, an electron acceptor, gets electrons transferred to it, making a molecule of FADH2, another type of electron carrier. Finally, the new four-carbon compound gets converted to another four-carbon compound, and can restart the cycle after acetyl-CoA enters again. Another molecule of NADH is also produced. carrier protein help the hydrogen ions to diffuse back into the inner compartment. This carrier protein also produces ATP after a phosphate group is added to ADP. Hydrogen ions and electrons combine with oxygen molecules to form water molecules.