a. Insulin is a steroid chemical.

b. TSH is emitted from the corpus luteum

c. Tetraiodothyronine is a crisis chemical.

d. The pineal organ is situated on the foremost piece of the kidney.

solution:

(a) Insulin is a protein chemical

(b) TSH is emitted from the front pituitary.

(c) Adrenaline is a crisis chemical.

(d) The adrenal organ is situated on the foremost piece of the kidney.