Thyroid hormone is classified as a steroid.
a. true
b. false

a. True

Explanation:

Hormones are signaling molecules that are produced by endocrine glands. The role of hormones is to control physiology or behavior. They can be classified into three categories: 

Peptide hormones – derived from a chain of amino acids

Amino acid or fatty acid hormones – derived from an amino acid or lipids respectively

Steroids – derived from cholesterol

Thyroid hormones are considered steroids. They are produced by the thyroid gland and are responsible for regulating metabolism.

the corpus luteum secretes estrogens and progesterone. the latter hormone causes changes in the uterus that make it more suitable for implantation of the fertilized ovum and the nourishment of the embryo. if the egg is not fertilized, the corpus luteum becomes inactive after 10–14 days, and menstruation occurs.

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