Homeostasis

Question 1

What is human physiology?

Answer 1

characteristics and mechanisms that make us function as a healthy being

Question 2

What is human pathophysiology?

Answer 2

the study of disordered body function

Question 3

What are the three types of body system?

Answer 3

digestive
respiratory
circulatory

Question 4

What is homeostasis?

Answer 4

physiological control systems to maintain stable internal environment in a fluctuating environment

Question 5

What are Cannons 4 propositions for homeostasis?

Answer 5

1. consistency mechanisms
2. steady-state conditions requires factors that resist change
3. cooperating mechanisms required
4. homeostasis is a result of organised self-government

Question 6

What mechanisms does homeostasis use?

Answer 6

negative feedback
feed forward
positive feedback

Question 7

What are examples of homeostasis?

Answer 7

thermoregulation
control of arterial pressure
glucose

Question 8

What are the sensors, controllers and effectors in thermoregulation?

Answer 8

sensor - skin
controller - hypothalamus
effectors - skin and muscle

Question 9

What are the sensors and effectors in the control of arterial pressure?

Answer 9

sensors - baroreceptors

effectors - blood vessels

Question 10

What are the sensors, controllers and effectors in glucose homeostasis?

Answer 10

sensors - pancreatic cells
controller - autonomic NS
effectors - alpha and beta pancreatic cells

Question 11

How is the GAIN calculated?

Answer 11

correction divided by error

Question 12

What are the 5 principles of homeostatic control?

Answer 12

1. primarily operate through a negative feedback mechanism
2. stability is achieved through balancing the inputs and outputs
3. unable to maintain complete consistency
4. unable to maintain every system constant
5. the set point of some control systems vary