Chapter 1 Flashcards
Patient is out of homeostasis
The patient is sick
Patient is in homeostasis
The patient is well
Homeostasis
Official: The tendency of an organism or cell to regulate its internal environment and maintain equilibrium, usually by a system of feedback controls, so as to stabilize health and functioning.
Basset’s: The body is in harmony with the universe
Mine: The body’s regulator to ensure a safe and functioning internal environment
What are the Homeostatic Mechanisms?
Negative Feedback Mechanism and Positive Feedback Mechanism
When does a Negative Feedback Mechanism occur?
24/7
What is the graph pattern of a Negative Feedback Mechanism
Fluctuation within a certain range (Squiggly Line)
What is a Negative Feedback Mechanism?
A reaction that causes a reaction
Examples of Negative Feedback Mechanisms
Regulation of body temp
Regulation of blood pressure
Regulation of the heart rate
Regulation of blood glucose
Regulation of ions in the blood
When does a Positive Feedback Mechanism occur?
Only under specific conditions
What is the graph pattern of a Positive Feedback Mechanism
A line angling upwards or downwards (one direction only)
What is a Positive Feedback Mechanism?
A stimulus that exaggerates a response, which will exaggerate another response, which will exaggerate another response etc.
Positive = keeps going (+)
Examples of Positive Feedback Mechanism
Labor contractions
Blood clotting
Fever-High temps will kill the bacteria that was causing the person to be out of Homeostasis
Labor Feedback
Labor contractions —> Stronger contractions —> Stronger contractions —> Stronger contractions —> Birth of child
Blood Clotting Feedback
Cut blood vessel —> Clot formation —> More clot formation —> Complete clot
Fever
98.6 —> 99 —> 100 —> 101 —> 102
Hopefully the disease causing bacteria have al been killed
Antagonistic Hormones
Hormones that work in opposition to each other to maintain homeostasis
Antagonistic Hormones that contribute to blood calcium ion concentration
Calcitonin(CT) = causes blood calcium ion concentration to drop
Parathormone(PTH) = causes blood calcium ion concentration to go up
Antagonistic Hormones that contribute to blood glucose levels
Insulin
Glucagon
Antagonistic Hormones that contribute to sodium ion levels in the blood
Atrial natriuretic peptide (ANP)
Aldosterone
Hormone released when a baby applies pressure in the uterus, creates more pressure
Oxytocin
