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Chapter 18: Problem 21

Which type of cell releases glucagon? A. Beta cell B. Alpha cell C. Plasma cell D. Delta cell

Short Answer

Expert verified
B. Alpha cell

Step by step solution

01

Understand the question

The question is asking which type of cell is responsible for releasing glucagon.
02

Review hormone functions in the pancreas

Glucagon is a hormone that raises blood glucose levels. It works as an antagonist to insulin.
03

Know the roles of pancreatic cells

The pancreas has several types of cells in the islets of Langerhans. Beta cells secrete insulin, alpha cells secrete glucagon, delta cells secrete somatostatin, and plasma cells are not related to hormone secretion.
04

Identify the correct cell type

Given the information, the alpha cell is responsible for releasing glucagon.
05

Choose the correct answer

From the provided options, B. Alpha cell is the correct answer.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Glucagon Secretion
Glucagon is a vital hormone in the body that helps regulate blood glucose levels. When blood sugar levels fall too low, glucagon is released.

Glucagon works by signaling the liver to convert stored glycogen into glucose, which is then released into the bloodstream. This process helps to increase blood sugar levels.

Without glucagon, your body wouldn't be able to effectively manage blood sugar levels, especially between meals or during physical activity.
Alpha Cells
Alpha cells are one of several types of cells found in the pancreas. They specifically reside within the islets of Langerhans, small clusters of cells in the pancreas.

The primary function of alpha cells is to secrete glucagon. When blood glucose levels are low, alpha cells release glucagon to help raise those levels.

This ensures that the body has a constant energy supply, which is especially important for brain function and physical activity.
Islets of Langerhans
The islets of Langerhans are specialized clusters of cells within the pancreas. They play a critical role in maintaining blood glucose homeostasis.

There are several types of cells within these islets:
  • Alpha cells, which secrete glucagon
  • Beta cells, which produce insulin
  • Delta cells, which release somatostatin
The islets of Langerhans serve as the central hub for hormone secretion, ensuring that our blood glucose levels are balanced for optimal bodily function.

Understanding the roles of these cells is essential for comprehending how the body manages blood sugar levels.

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