Nutrition, blood glucose and homeostasis

≈ 48 min

Nutrition, blood glucose and homeostasis

Homeostasis keeps internal conditions within ranges that support cells. After a carbohydrate-rich meal, blood glucose rises. The pancreas releases insulin, encouraging body cells to take up glucose and the liver to store some as glycogen. When blood glucose falls, glucagon promotes release of stored glucose. This is negative feedback: the response counteracts the original change.

Work it through

If blood glucose rises above the usual range, insulin is released. As cells absorb glucose and the liver stores glycogen, blood glucose falls back toward the set range. The response slows when the condition is corrected.

Mastery target

Draw or explain a negative-feedback loop using stimulus, detector, signal, response and return toward a range.

Which hormone helps lower blood glucose after a meal?

Insulin

Glucagon

Chlorophyll

Adrenaline only

Name the key biological term from Nutrition, blood glucose and homeostasis: enter the term that best fits the explanation and visual model.

Which event is most likely when blood glucose falls during a long gap between meals?

Glucagon promotes release of stored glucose.

Insulin rises to store more glucose.

Photosynthesis begins in the liver.

All cells stop respiring.

Which statement corrects a common misunderstanding in Nutrition, blood glucose and homeostasis?

Correct: Negative feedback does not mean the response is harmful; 'negative' means it opposes the initial change.

A single observation is enough to prove every biological claim.

Scientific terms are interchangeable whenever they sound similar.

A process always has exactly the same result in every environment.