Animal Physiology Chapter 6
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Descirbe the endocrine system.
Cells, tissues, and organs (endocrine glands) secrete substance (hormone) into the internal environment
What is a hormone?
regulatory chemicals secreted into bloodstream to target cells
What do hormones regulate?
- metabolic processes
Do endocrine or exocrine glands have ducts?
What are the 7 primary endocrine glands?
- hypothalmus and pituitary gland
- pineal gland
- thyroid gland and parathyroid gland
- adrenal glands
What are some steriod or steroid like hormones?
- sex hormones
- adrenal cortex hormones
- thyroid hormones
What are some nonsteriod hormones?
- most hormones
What does the hormone do if the receptor is located in the nucleus?
the hormone diffuses into the nucleus and binds the receptor, forming a hormone-receptor complex
What does a hormone do if the receptor is located in the cytosol?
hormone binds to it there, forming a hormone-receptor complex that enters the nucleus
What does the hormone do after it enters the nucleus?
the complex binds to a certain region of DNA called the hormone response element (HRE) which is located at the beginning of a specific gene
What happens when the complex binds to the HRE?
it activates or deactivates the gene, which affects transcription of mRNA
What happens if the gene is activated after the complex binds to the HRE?
- mRNA is moved to the cytosol
- mRNA is translated by ribosomes and yields protiens that perform action intended
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