Homeostasis

Question 1

What is the definition of homeostasis

Answer 1

The tight regulation of the bodies internal environment

Question 2

Physiological variables affecting homeostasis.

Answer 2

• Temperature
• Water balance (intake v output)
• Electrolyte balance ( Na, K, Ca, Mg, balance)
• Blood glucose levels
• Blood and tissue oxygen and carbon dioxide levels
• Blood pressure regulation

Question 3

Homeostasis is controlled by…..

Answer 3

control systems which detect and respond to change within the internal environment.

Question 4

What are the 3 components of control systems?

Answer 4

• Detector (sensor)
• Control centre
• Effector

Question 5

What is the role of the detector within control systems?

Answer 5

Monitors the value of some variable.

Question 6

What is the role of the control centre within control systems?

Answer 6

Establishes the set point required for the certain variable.

Question 7

What is the role of the effector within control systems?

Answer 7

Can change the value of the variable.

Question 8

Define positive feedback loops

Answer 8

A change in a given direction causes additional change in the same direction.

Question 9

Define negative feedback loops

Answer 9

A change in given direction causes change in the opposite direction.

Question 10

When does homeostatic imbalance occur?

Answer 10

If a rapid change occurs, body responses may not be able to adapt in a timely manner and the system may shift outside normal physiological range.