Questions and Answers
Which hormone is secreted by the pancreas to lower blood glucose levels?
The release of hormones from the pituitary gland is always triggered by the nervous system.
False
What is the primary function of hormones released by the pituitary gland?
To regulate the release of other hormones
The hormone _____ released from the hypothalamus stimulates the pituitary gland to release follicle-stimulating hormone (FSH).
Signup and view all the answers
Match each type of hormone with its characteristic:
Signup and view all the answers
Which hormone is known for raising blood sugar levels?
Signup and view all the answers
Steroid hormones are both hydrophilic and lipid soluble.
Signup and view all the answers
Name one function of insulin in the body.
Signup and view all the answers
Hydrophilic hormones bind to __________ on the surface of target cells.
Signup and view all the answers
Match the hormones with their primary functions:
Signup and view all the answers
Which type of hormone usually produces fast responses in target cells?
Signup and view all the answers
Non-steroid hormones can diffuse directly through the cell membrane.
Signup and view all the answers
What is one characteristic of steroid hormones in relation to cell membranes?
Signup and view all the answers
The __________ hormone complex enters the nucleus to initiate transcription of specific genes.
Signup and view all the answers
What type of hormone is made from cholesterol?
Signup and view all the answers
Peptide hormones can easily pass through the phospholipid bilayer of the cell membrane.
Signup and view all the answers
Name one example of a peptide hormone.
Signup and view all the answers
FSH promotes the development of ______ in women.
Signup and view all the answers
Match the hormone with its type:
Signup and view all the answers
How do steroid hormones primarily affect cells?
Signup and view all the answers
Epinephrine is a steroid hormone that affects the cardiovascular system.
Signup and view all the answers
What is the role of the pituitary gland in the endocrine system?
Signup and view all the answers
Study Notes
Hormone Types and Structure
- Hormones can be classified as peptides, proteins, or steroids based on their structural properties.
- Peptides consist of short chains of amino acids (polypeptides).
- Proteins are longer chains of amino acids, often derived from tyrosine.
- Steroids are lipids derived from cholesterol and are lipid-soluble.
Hormone Mechanism of Action
- Peptide and protein hormones, which are polar, cannot diffuse across cell membranes and instead bind to surface receptors.
- Upon binding, they activate relay proteins inside the cell, initiating cascades that alter metabolism and gene expression.
- Steroid hormones diffuse through the cell membrane due to their lipid solubility, binding to internal receptors in the cytoplasm or nucleus.
- The receptor-hormone complex formed in steroid action enters the nucleus to affect transcription of specific genes.
Examples of Hormones
-
Peptide Hormones:
- ADH (Antidiuretic Hormone): Manages water levels; acts in kidneys.
- Insulin: Lowers blood sugar; produced in the pancreas.
- Glucagon: Raises blood sugar; also produced in the pancreas.
-
Protein Hormones:
- Epinephrine (Adrenaline): Produced in adrenal glands; involved in fight or flight response.
- Human Growth Hormone: Influences bone and muscle mass and decreases fat; secreted by anterior pituitary.
- Norepinephrine: Similar role to epinephrine, mainly acting on cardiovascular systems.
- FSH (Follicle-Stimulating Hormone): Promotes egg development in women and sperm in men; made in the anterior pituitary.
-
Steroid Hormones:
- Oestrogen: Develops secondary sexual characteristics in females; produced in ovaries.
- Testosterone: Promotes development of male reproductive system.
Hormone Release Mechanisms
- Hormones can be released in response to signals from the nervous system or other hormones.
- Example: Insulin release is triggered by the nervous system's signals to the pancreas.
- Hypothalamus releases GnRH which stimulates the pituitary gland to release FSH, affecting ovarian hormone production.
Blood Glucose Regulation
- Blood glucose levels are tightly regulated to stay within a tolerance range.
- Specialized pancreatic cells detect deviations and secrete glucagon or insulin, which exert opposite effects on blood glucose levels.
Characteristics of Hormone Responses
- Peptide hormones produce rapid, short-term responses due to their water solubility and receptor action.
- Steroid hormones result in slower, long-term responses by altering gene expression through direct interaction with DNA.
Studying That Suits You
Use AI to generate personalized quizzes and flashcards to suit your learning preferences.
Description
Explore the different classes of hormones in this quiz, focusing on peptides, proteins, and steroids. Each type is defined by its unique structure and composition, with specific functions in the body. Test your knowledge on their characteristics and differences!
