When exercising, a person's pulse rate should not exceed a certain limit, which depends on his or her own age. this maximum rate is represented by the expression 0.8(220-a), where a is age in years. find the age of a person whose maximum pulse is 152?

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.