Human intestinal glands contain ___
**Core Concept**
The human intestinal glands, also known as the crypts of Lieberkühn, are specialized structures in the intestinal epithelium responsible for the production and secretion of various digestive enzymes and hormones. These glands are crucial for maintaining the intestinal mucosa's integrity and facilitating nutrient absorption.
**Why the Correct Answer is Right**
The intestinal glands contain goblet cells, which are specialized epithelial cells responsible for producing and secreting mucin, a key component of mucus. Mucin helps to protect the intestinal epithelium from mechanical and chemical damage, while also facilitating the movement of food particles through the digestive system. The goblet cells are characterized by their abundant production of mucin, which is produced in the form of granules that are released into the intestinal lumen.
**Why Each Wrong Option is Incorrect**
**Option A:** Paneth cells are another type of epithelial cell found in the intestinal glands, but they are primarily involved in the production of antimicrobial peptides, such as defensins, which help to protect the intestinal epithelium from bacterial infection.
**Option B:** Enteroendocrine cells, also known as neuroendocrine cells, are found in the intestinal glands and are responsible for producing various hormones, such as secretin and cholecystokinin, which regulate digestive enzyme secretion and pancreatic juice production. However, they are not the primary component of the intestinal glands.
**Option C:** Absorptive cells, also known as enterocytes, are the primary cells responsible for nutrient absorption in the intestinal epithelium. While they are found in the intestinal glands, they are not the characteristic cells of these structures.
**Clinical Pearl / High-Yield Fact**
The intestinal glands are a key site of epithelial regeneration and repair in the intestinal mucosa. Damage to these glands can lead to impaired digestive function and increased susceptibility to intestinal infections.
**Correct Answer:** D. Goblet cells.