6.7 Principles of homeostasis

Question 1

What is homeostasis?

Answer 1

• Maintenance of a stable internal environment
• By physiological control systems

Question 2

What factors are important to maintain stable?

Answer 2

• Core temperature
• Blood pH
• Blood glucose concentration
• Blood water potential

Question 3

How does negative feedback work?

Answer 3

• Receptors detect a change away from optimum
• Effectors work to counteract change
• Returning levels to normal
• Separate mechanisms working in different directions give a greater degree of control over changes

Question 4

How does positive feedback work?

Answer 4

• Receptors detect a change away from optimum
• Effectors work to amplify change
• Producing greater deviation from normal