A boxer has been jumping rope for an hour. His leg muscles are burning and he feels weak. Which of the following most likely explains the burning he
feels in his muscles?
A. High oxygen levels
B. Ethanol buildup
C. Aerobic respiration
D. Lactate buildup

Imagine a self-reactive t cell that has not undergone clonal deletion in the thymus (that is to say, it has escaped central tolerance). if it encounters self antigen in the absence of an infection or inflammation, what will happen to this self-reactive t cell? (select two answers) (a) the t cell undergoes clonal expansion. (b) the t cell gains effector functions. (c) the t cell undergoes apoptosis. (d) the t cell becomes activated. (e) the t cell becomes anergic.