Homeostasis: Lecture 1 Flashcards
How many cells do we end up with?
approx 10^14 cells with different structure and functions
What does homeostasis do?
maintain in optimal environment for internal cellular function
What is homeostasis (definition)
relatively stable condition of extracellular fluid that results from regulatory system actions
What is the ideal temperature for the cell?
37 degrees
How many breaths do we take per minute?
12 breaths per minute
What is the ideal pH level?
7.4
What are the 3 key steps in a general feedback system?
- Sensory system
- Relay station
- Response system
How do we maintain homeostasis?
Feedback systems
What are the 2 types of feedback systems?
- Negative
- Positive
What is a negative feedback system?
this is where the response can counteract the initial stimulus
Which type of feedback is more common?
Negative
Are negative feedback systems constant?
yes
What are the steps of a negative feedback system?
- Variable that has a set point
- Sensor that senses fluctuations in that variable
- Integrator can process the change in a given variable, that was sensored and it coordinates a response to regulate the variable. (To get it back to it’s set point)
What is disregulation?
When we cannot get back to our set point
What is positive feedback?
this is when we add to the stimulus, we get further away from our set point
What is an example of postivie feedback?
uterine contractions become increasingly stronger until the birth of the baby
True or False
Positive feedback moves you farther away from homeostasis, where negative feedback is an attempt to bring you back to homeostasis
True
What is feedforward regulations?
feeding forward is the prime of systems for challenges to come
- anticipatory situations
