Powerpoint 1 Flashcards
What is feedback?
Relaying of information bout a given condition to the appropriate organ system
What is negative feedback?
Feedback to restore homeostasis. The reverse of the original signal
What is positive feedback?
When the stimuli is enhanced or continued
What are the beneficial positive feedbacks?
Labor
Blood clotting
Atrial natriuretic peptide/hormone ((heart overworked))
What are the two systems involved in feedback?
Nervous and endocrine
What does the nervous system do in feedback?
Transmits and receives impulses
What does the endocrine system do in feedback?
Secrets hormones
What are the four fluid compartments?
1) Intracellular fluid (icf)
2) extracellular fluid (ecf)
A- interstitial
B- intravascular
*transcellular
Where is intracellular fluid found?
Inside the cell
How much of icf is found?
60-65%
What are the functions of icf?
To stabilize agents for parts of the cell and to assist with transport of nutrients in and out of the plasma membrane
Where is extracellular fluid located?
Outside the cell
How much ecf is found?
35-40%
What are the types of ecf?
1) interstitial
2) intravascular
3) transcellular
Where is interstitial fluid found?
Tissue
Where is intravascular fluid found?
Plasma
Ecf is the most…
Regulated body fluid
What are the controlling organs that maintain ecf?
Brain, kidneys and pit glands
What are the primary mechanisms regulating ecf?
Kidneys, adrenal cortex and hypothalamus
What is the hypothalamus?
Thirst center
What is adh and what does it do?
Antidiuretic hormone and its part of negative feedback mechanism respond to conditions in the cardiovascular system
What is the RAA system?
The renin angiotensin aldosterone system
What does RAA control?
Fluid volume and it causes higher blood pressure which causes aldosterone secretion. Also causes na reasorptuon and equals lower urine output
What is anp/anh
Atrial natriuretic peptide or hormone
