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LVN Program – 2 nd Semester. Endocrine VNRS P025A. Mrs. Keele. Mrs. MOM G-ma P.T.A. C.N.A. Psych. Tech. LPN BSN. RN CN DON DSD DOE CRRN. Housekeeping. Be on time Breaks are flexible Dr. Water only! Casual environment Ask questions!. Syllabus. Hours/Days:
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LVN Program – 2nd Semester Endocrine VNRS P025A
Mrs. Keele • Mrs. • MOM • G-ma • P.T.A. • C.N.A. • Psych. Tech. • LPN • BSN • RN • CN • DON • DSD • DOE • CRRN
Housekeeping • Be on time • Breaks are flexible • Dr. Water only! • Casual environment • Ask questions!
Syllabus Hours/Days: Monday: 8:30 AM – 2:20 PM Tuesday: 8:30 AM – 2:20 PM One 20 min break in the AM and a 60 minute break for lunch
General Rule • If you are unable to attend class, you must notify the instructor prior to class. • Only excused absences will be given an opportunity to make up quizzes/tests. • Cannot make up participation • Homework will not be accepted late unless excused by the instructor.
Office Hours • Lunch and Breaks • Call me at home! • 793-1664 • Please do not call • after 10:00 p.m. • on Sundays
Web site • www.portervillecolege.edu/eKeele/ • Search engine • PC web page – instructors web pages • E-mail • elizabethkeele@sbcglobal.net
F.Y.I. • No need to bring books • Cel phones on vibrate • Tape players are encouraged
Welcome to 2nd Semester • Harder? • Critical thinking • Full time job
What is the Endocrine System? • Similar to nervous system • Function • Communication • Control
Endocrine System The link between the nervous system and the endocrine system: The Hypothalamus
Endocrine vs. Exocrine Endocrine: • Secrete hormones • Directly into the blood stream • Target specific organs/receptors • Specific action • No DUCTS
Endocrine vs. Exocrine Exocrine: • Secrete fluids • Via ducts!
Which type of gland would you expect to be more vascular? • Endocrine • Exocrine • Both are equally vascular • No fair asking a test question in the first hour of class!
Endocrine Glands • Pineal • Pituitary • Thyroid • Parathyroid • Thymus • Adrenal Medulla • Adrenal Cortex • Islets of Langerhans • Ovaries • Testes
General function of the Endocrine System • Secrete hormone • Affect rate of ongoing processes
Epinephrine is a hormone secreted by the adrenal medulla. What affect would you expect epinephrine to have on the heart? • Change the color of the heart • Change the size of the heart • Change the speed of the heart beat • Change the strength of the heart beat
What is a hormone? • Chemical • Bloodstream • Specific target cell / organ • Causes target cell to act • Specific action! • h or i in body function
Hormones are involved in all aspects of metabolism • Growth • Reproduction • Energy production • Regulation of fluid and electrolyte balance • Regulation of body pH • Resistance to stress
Metabolism & Synthesis "Hormones are involved in all aspects of metabolism” Metabolism: Break-down of molecules to make energy (burning) Synthesis: Building-up of molecules
How do hormones work? Non-linear, 6 step process
1. Homeostasis • Change in homeostasis • i.e. • Body temperature lowers • Heart rate slows • Increased blood sugar levels
Sensors • Sensors • Monitor homeostasis • Identify change in homeostasis • Responds to change • Initiate a specific stimuli
3. Hormone secretion • Specific stimuli • Endocrine gland • Secretes hormone
4. Bloodstream • Hormone secretion directly into the bloodstream • Circulated by the bloodstream • Body
5. Target organ • Hormones in the blood stream • entertarget organs/tissues that have “receptors” for that hormone
6. Action • The hormone (when it enters the target organ) • produces a specificaction • Action is usually opposite to the initial homeostasis change. • (Body temperature lowers) increased body temp. • (Heart rate slows) increase heart rate • (Decreased blood sugar levels) increase BS levels • (Increase in blood glucose levels) decrease BS levels • (High blood pressure) lowers BP • (Dehydration) increased hydration
1. Homeostasis • Specific action • Restores homeostasis • Sensor i stimuli • i hormone secretion • Negative feedback!
“Negative Feedback Mechanism” • “The effects of the hormone often will reverse the stimulus and ultimately lead to decrease secretion of the hormone.”
“Negative Feedback Mechanism” i process (homeostasis) h stimuli h hormone secretion h process (homeostasis) i stimuli i hormone secretion
How to assess the Endocrine System? • Not palpate • Not ascultate • HOW???? • Labs • S&S
Key Concept! • “In the health physiological state, hormone concentration in the bloodstream is maintained at a relatively constant level.”
Small Group Questions • Name three characteristics of the endocrine system. • What is the function of a hormone? • How do hormones work? • What is “Negative Feedback Mechanism”? • How do the endocrine systems and the nervous system communicate? • What must happen to a gland in order for it to secrete a hormone?