Transcript Lecture 1A PowerPoint

LVN Program –
nd
2
Endocrine
VNRS P025A
Semester
Mrs. Keele
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Mrs.
MOM
G-ma
P.T.A.
C.N.A.
Psych. Tech.
LPN
BSN
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RN
CN
DON
DSD
DOE
CRRN
Housekeeping
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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
– [email protected]
F.Y.I.
• No need to bring
books
• Cel phones on vibrate
• Tape players are
encouraged
HONESTY!
Welcome to
• Harder?
• Critical thinking
• Full time job 
nd
2
Semester
What is the Endocrine System?
• Similar to nervous
system
• Function
– Communication
– Control
Endocrine vs. Nervous system
Endocrine
System
Speed
Slower acting
Nervous
System
Fast acting
Duration Long lasting
Short acting
Structure Gland 
hormones
Nerves 
electrical impulses
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?
A.
B.
C.
D.
Endocrine
Exocrine
Both are equally vascular
No fair asking a test question in the first
hour of class!
Endocrine Glands
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Pineal
Pituitary
Thyroid
Parathyroid
Thymus
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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?
A.
B.
C.
D.
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?
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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
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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
Homeostasis
Sensor
Hormone
secretion
Action
Target
organ
Bloodstream
1. Homeostasis
• Change in homeostasis
– i.e.
• Body temperature lowers
• Heart rate slows
• Increased blood sugar levels
2. 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 
• enter target organs/tissues that have
“receptors” for that hormone
6. Action
• The hormone (when it enters the target organ) 
• produces a specific action
• Action is usually opposite to the initial homeostasis change.
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(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
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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
1. Name three characteristics of the endocrine
system.
2. What is the function of a hormone?
3. How do hormones work?
4. What is “Negative Feedback Mechanism”?
5. How do the endocrine systems and the nervous
system communicate?
6. What must happen to a gland in order for it to
secrete a hormone?