Homeostasis Introduction

Question 1

What is homeostasis?

Answer 1

• our tendency to maintain a certain range of internal conditions or environments

Question 2

What are some example of factors that plan into homeostasis?

Answer 2

• body temperature
• internal pH
• internal concentrations of various ions • hydration
• blood pressure
• glucose levels in the blood

Question 3

What are the two feedback system loops and what do they include?

Answer 3

• positive and negative feedback system loops both include: ….

• a sensor (receptor) - a structure that detect changes and SENSES SIGNALS to the control centre using sensory neurons

• a control centre - the control nervous system DETERMINES THE ACTIONS NECESSARY in order to maintain a range of values

• an effector - RECEIVES SIGNALS from the control centre via motor neurons. Effectors bring about change in response to signals from the control centre

Question 4

What does a negative feedback loop do?

Answer 4

• they work to counteract changes to normal system / body conditions