How many types of hormone and explain the all hormone
Answers
Hormones can be classified into two main types: peptide hormones and steroid hormones.
Peptide Hormones
These protein hormones are composed of amino acids. Peptide hormones are water-soluble and are unable to pass through a cell membrane. Cell membranes contain a phospholipid bilayer that prevents fat-insoluble molecules from diffusing into the cell. Peptide hormones must bind to receptors on the cell's surface, causing changes within the cell by affecting enzymes within the cell's cytoplasm. This binding by the hormone initiates the production of a second messenger molecule inside the cell, which carries the chemical signal within the cell. Human growth hormone is an example of a peptide hormone.
Steroid Hormones
Steroid hormones are lipid-soluble and able to pass through the cell membrane to enter a cell. Steroid hormones bind to receptor cells in the cytoplasm, and the receptor-bound steroid hormones are transported into the nucleus. Then, the steroid hormone-receptor complex binds to another specific receptor on the chromatin within the nucleus. The complex calls for the production of certain RNA molecules called messenger RNA (mRNA) molecules, which code for the production of proteins.
Steroid hormones cause certain genes to be expressed or suppressed by influencing gene transcription within a cell. Sex hormones (androgens, estrogens, and progesterone), produced by male and female gonads, are examples of steroid hormones.