Feedback system

Question 1

What are the variables or the controlled condition within the body

Answer 1

• blood sugar
• fluid balance
• body temperature
• oxygen level
• blood pressure
• pH

Question 2

What is homeostasis?

Answer 2

The condition of equilibrium in the body’s internal environment due to the constant interaction of the body’s many regulatory process.

Question 3

What is normal level of glucose in blood?

Answer 3

It stays between 70-110mg of glucose per 100ml of blood.

Question 4

What is homeostatic control?

Answer 4

Homeostasis is regulated by :
- Nervous system regulates by sending electric signals known as nerve impulses to organs
- Endocrine system secretes many messenger molecules called hormones.

Question 5

What is feedback systems?

Answer 5

The cycle of events in which the status of the body condition is monitored, evaluated, changed, re-monitored, reevaluated

Question 6

What is controlled condition and stimulus

Answer 6

• controlled condition: Each monitored variable is body temperature, blood pressure, or blood glucose level.
• stimulus: Any disruption that changes a controlled condition.

Question 7

What are the components of homeostatic control system?

Answer 7

• Monitor/ receptor- Detects a change in variable.
  (input is in the forms of electric signal or chemical signals)
• Control center- 1. receives a message from the monitor.
  
  2. Directs a response via regulator
     (output is in the form of nerve impulse or hormone)
• Regulator/effector- Carries out the response initiated by the co-ordinating center.
  nearly every organ/tissue in the body can behave as an effector.

Question 8

What is negative feedback?

Answer 8

Negative feedback reverses a change in the controlled condition to bring it back to the steady state.
eg) regulation of blood pressure, temperature, and blood sugar etc.

They regulate conditions that remain fairly stable over long periods

Question 9

What is positive feedback?

Answer 9

This system tends to reinforce or strengthen a change in one of the body’s controlled conditions.
eg. Cervical stretching during childbirth
This moves the variable away from a steady state condition.

This cont. until it gets interrupted by some mechanism.
(they reinforce conditions that does not happen very often)

Question 10

What decision does the control center make during child birth (cervical stretching)

Answer 10

They release oxytocin