Homeostasis & Feedback Loops - Term 1 Y9

Question 1

Explain Homeostasis

Answer 1

For Example – As your body converts food into energy during exercise, it produces heat as a waste product. This extra heat can elevate your body temperature above the typical 37°C. To maintain homeostasis, the blood vessels in your skin dilate to allow more blood flow to the surface of your body where it disperses the heat.

Question 2

Explain Feedback loops

Answer 2

The intake of food can make the blood glucose levels rise, which then starts a feedback loop by secreting insulin and breaking down the food so that the homeostasis levels can reach a stable level of blood glucose in the body.

Question 3

How does homeostasis occur when breathing?

Answer 3

By controlling the balance of oxygen and carbon dioxide in the body and changing the breathing rate to meet the energetic demands of the body.

Question 4

What is Homeostasis?

Answer 4

Homeostasis is the ability to maintain a stable state.

Question 5

How do feedback loops affect homeostasis?

Answer 5

Homeostasis affects the feedback loops by acting opposite to the stimulus, or cue, that triggers them.

For Example: if your body temperature is too high, a negative feedback loop will act to bring it back down towards the set point, or target value, of 37.0 ∘ C.

Question 6

What are some of the types of reflexes?

Answer 6

Startle Reflex: moving away, contraction of arm and leg muscles, blinking, breathing changes.

Withdrawal Reflex: moving away from potentially harmful influence (e.g high tem)

Iris Reflex: Pupil becomes smaller in bright light.