Chapter 33.3- Homeostasis

Question 1

What is homeostasis? What does it affect in aminals?

Answer 1

• the maintance of stable internal conditions of an animal
• effects body temperature and PH

Question 2

Describe negative feedback

Answer 2

Negative feedback is when a stimulus acts on a sensor which produces a response that is the opposite of the intial sensor

Think of it like a fake friend backstabbing after you tell her your business

Question 3

What are the components if a negative feedback system?

Answer 3

1. A stimulus
2. Sensor: Measures the variable being regulated
3. Integrator: Compares the sensed information with a set point
4. Effector: Makes the corrective response

Question 4

What are examples of negative feedback ?

Answer 4

• control of room temperature
• humans regulating body temperature

Question 5

What is a positive feedback mechanism?

Answer 5

• A physiological process that amplifies change rather than fight it

Question 6

What are the three ways animals try to approach homeostasis?

Answer 6

Active regulate: use internal mechanisms to defend a relatively constant state.

Go with the flow: Vary internal state with that of the environment

Move to a different environment: Minimize internal variations by avoiding environmental disturbances.

Question 7

What are endotherms?

Answer 7

• animals that produce most of their heat from breaking down food
• Typically maintain stable body temperatures
• Birds humans cows whales

Question 8

What are ectotherms?

Answer 8

• animals that obtain most of their heat from their environment
• change body temperature and behavior to fit enviorment
• cold-blooded animals ( reptiles, most fishes, worms and lobster

Question 9

Why shouldnt we look at endothermy and ectothermy as binary catergories?

Answer 9

• it is a spectrum

example: Tunas are more endothermic than other fishes using active muscles to generate heat and maintain a fast metabolism