You are not the only one. With increase in fitness is usually an increase in slow oxidative fibers. The answer depends on the type of animal. In an endotherm, the only time MR will increase with increasing Ta is above the upper critical temperature. MR increases as a result of sweating and panting, thus MR is elevated a little bit to help dissipate heat.
Endplate is the area on the post-synaptic cell that expresses all of the neurotransmitter receptors.
It is the synapse region on the post-synaptic cell. There is not a relationship between T4 in the blood and brown fat. The glucose is metabolized to lactate for energy production for the glial cell. The nerve terminal benefits by being able to metabolize the lactate for short term energy supply. As Ta continues to drop, there is some temperature at which MR is maximal.