Aparna, a gross anatomist who has been teaching human anatomy for 35 years, told her class that in adults the thymus is atrophied and has no function. Is she correct? Explain.

Although the thymus is shrinking with age, it is still functional in adults, thereby this statement is incorrect  

Explanation:

The thymus is a specialized primary lymphoid organ that has a key role in the production and maturation of T cells (i.e., thymus-derived cells). The thymus grows until puberty, but during adulthood, this vital organ starts to shrink, a process known as 'thymic involution'. During all life, the thymus plays roles in immunity and autoimmunity. The thymus produces progenitor cells that mature into T-cells, which are one of the main components of the adaptive immune system. These cells function by killing infected/sick cells (for example, cancer cells), by activating other immune cells, by synthesizing signaling molecules (i.e., cytokines), etc.

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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1. amino acid refers to the fundamental building block of proteins, comprising of an amino group and a carboxyl group.

2. catalyst refers to any substance, which increases the rate of chemical reaction without being used up in the reaction.

3. a complex molecule containing he genetic code is dna or deoxyribonucleic acid.

4. an enzyme refers to a molecule of protein, which is unique in accelerating up a particular chemical reaction in the biological systems.

5. nucleic acid refers to an sequence of sugars, phosphates, and nitrogenous bases, for example, dna and rna.

6. a protein refers to a large, composite organic molecule comprising of a huge number of amino acids associated together with the of peptide bonds.

7. rna refers to a nucleic acid that takes part in the production of proteins.

8. substrate refers to a compound, which takes part in a chemical reaction, and is chemically modified by the reaction.