ENDOCRINE SYSTEM Flashcards
(20 cards)
Endocrine System:
System of glands that secrete hormones
True or False: The endocrine system works in conjunction with the nervous system
True
Hormones regulate metabolic activities of other cells & control:
- Growth & Development
-Reproduction
-Cellular metabolism
-Body defenses - Homeostatic balances
Are endocrine glands ductless?
Yes
List the endocrine glands:
-Pituitary
-Parathyroid
-Thyroid
-Pineal
-Adrenal
The neuroendocrine organ:
Hypothalamus
Organs with exocrine and endocrine functions:
-Pancreas
-Placenta
-Gonads
Other tissues & organs that produce hormones:
-Adipose Cells
-Thymus
-Stomach
-Kidneys
-Cells in the walls of the small intestine
True or False: Hormones are chemical messages?
True
Amino acid- based hormones:
Water soluble (except thyroid hormone)
Steroids (Structural basis: cholesterol)
Lipid soluble
Action of hormones:
-Target cells
-Cells that have receptors for a specific hormone
Hormones alter target cell activity & may:
- Alter membrane permeability
-Stimulate synthesis of enzymes
-Activate or deactivate enzymes
-Induce secretory activity
-Stimulate mitosis
Hormone blood levels are mostly controlled by what type of feedback systems?
Negative feedback systems
(Hormone effects shut off section)
Hormone release is triggered by:
Endocrine gland stimuli:
- Humoral Stimuli
- Hormonal Stimuli
- Neural Stimuli
(Nervous System Stimulation)
Half-Life:
Time for level of hormones in blood to decrease by half
(Half-Life varies by hormone)
True or False: Water Soluble hormones have shorter half lives
True
True or False: Hormones don’t affect the function of every organ system?
False. Hormones affect the function of every organ system
Amount of time for onset of hormonal effects ____
Varies
Duration of effects:
May drop with blood levels or linger for hours
