Lecture 1- The Endocrine System's Role in Homeostasis
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What is homeostasis?
The maintenance of normal internal conditions in a cell or organism by means of self-regulating organisms.
In nearly all animals what systems function in concert to maintain homeostasis?
The Endocrine System and The Nervous System
In what 2 ways can the Nervous System detect a stimulus?
- Nervous Reaction
- Communication with the Endocrine System
What is the Endocrine System classified as, and what does it involve?
An internal system of chemical communication involving:
- Ductless glands that secrete hormones
- Molecular receptors on or in target cells that respond to different hormones
Do not have a tube or duct to deposit hormones (products of the glands) directly where needed so they secrete hormones into the bloodstream. This makes the hormones interact with every cell in the body.
Hormones are one of the four kinds of what?
What are signaling molecules?
Hormones and secretions that can bind to target cells and elicit a response
What are the four kinds of signaling molecules?
- 1. Animal Hormones
- 2. Neurotransmitters
- 3. Local Signaling Molecules
- 4. Pheromones (The only signaling molecule released into the enviroment to be detected by a target organism)
Hormones or other signaling molecules interact with _______ of target cells.
Cells will not respond to a hormone unless they have what?
Receptors for it. Not all protien receptors work for all hormones.
One or more hormones may inhibit, enhance, or prime a target cell's capacity to respond to another kind of hormone. This means?
A cell may have to respond to a certain hormone before responding to another.
Feedback mechanisms often influence the concentrations of different hormones in a tissue, which can alter the cellular response.
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