Question

question 3

based on the diagram which of these acts as a key?

insulin
pancreas
glucose
islets of langerhans

Explanation:

Analyze the question prompt

The question asks: "Based on the diagram which of these acts as a key?" The options provided are Insulin, Pancreas, Glucose, and Islets of Langerhans.

Apply biological concepts

In physiological models of blood glucose regulation, Insulin Regulation is often represented using a lock-and-key analogy. Insulin acts as a chemical messenger (the "key") that binds to specific insulin receptors (the "lock") on the cell membrane.

Connect to cell signaling

When insulin binds to its receptor, it unlocks the cell, signaling glucose transport proteins (such as GLUT4) to move to the cell membrane and allow glucose to enter the cell from the bloodstream. Therefore, insulin is the molecule that acts as the key.

Answer:

• Insulin (Correct answer)
• Pancreas
• Glucose
• Islets of Langerhans