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Terms in this set (14)
What is a Hormone?
a hormone is a chemical signal found in multicellular organisms. interact with target cells and travel in body fluids.
What do endocrine glands do?
They are DUCTLESS glands that secrete their products, hormones, directly into the blood.
What are the major glands of the Endocrine system?
What do the Exocrine glands do?
Secrete substances onto an epithelial surface by way of a duct.
What are some examples of the major exocrine glands
How is it that the protein hormones exert their effects in the system?
Amino acids and peptides are unable to cross the cell membrane (phospholipid membrane) so they will activate a receptor to communicate the message to the nucleus inside the cell to carry out the action
Steroid (fat) hormones are believed to exert their effects in the endocrine system in what way?
Lipids are able to directly go through the cell membrane and bind to a receptor to move into the nucleus. It then binds with the DNA sequence to increase or decrease certain genes.
The pituitary gland is made up of three layers.
anterior, interior, and posterior
THe anterior consist of 7 MAJOR pituitary hormones.
Thyroid Stimulating Hormone (TSH)
Adrenocorticotropic Hormone (ACTH)
Follicle-stimulating hormone (FSH)
Luteinizing Hormone (LH)
Growth Hormone (GH)
Melanocyte stimulating hormone (MSH)
What does the Thyroid-stimulating hormone do?
Acts on the thyroid gland to stimulate the release of the thyroid hormones
Thyroid hormones then return to the anterior pituitary and inhibit the release of TSH and RH from the Hypothalamus
What does the Adrenocorticotropic hormone do?
Stimulates the release of steroid hormones at the adrenal glands
What does follicle stimulating hormone do?
In women, FSH helps control the menstrual cycle and the production of eggs by the ovaries.
In men, FSH helps control the production of sperm
What does luteinizing hormone do?
Stimulates ovaries to produce estrogen and progesterone. also induces ovulation (expulsian of an egg) in females. Stimulates testes to release androgens, to produce testosterone.
What does growth hormone do?
Stimulates cell growth and replication by increasing rate of protein production. All cells respond but, muscle cells and chondrocytes are most sensitive.
Plays a part in mobilizing energy reserves by breaking glycogen from teh liver into useable glucose.
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