NATS 1675 Lecture Notes - Lecture 20: Cell Membrane, Conformational Change, Blood Sugar
4 Aug 2015
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Document Summary
Steroid hormones such as estrogen or testosterone can diffuse through the target cell membrane and bind with an intracellular receptor. Steroid hormone diffuses across plasma membrane into the cell. Hormone receptor complex binds to dna, inducing a change in gene activity. Genes are turned on selectively when certain processes occur. Peptide hormones cannot pass through the cell membrane directly but bind with receptors on the outside of the target cell membrane. Not as big as a protein but is a component of a protein. When a protein is digested, it is broken down into something called a peptide and then into amino acids. Peptide binds to the receptor in the cell membrane. Receptor releases a chemical called a second messenger chemical reaction when the hormone and receptor bind we get a second messenger second messenger can pass through the nucleus to activate genes. How they get into the cell to change nuclear function.
