Structure of the Jejunum

The jejunum is approximately 2.5 meters long and is characterized by its numerous circular folds called plicae circulares, which increase the surface area for nutrient absorption. These folds are covered in tiny projections called villi and microvilli, further enhancing the absorptive capacity of the jejunum. The wall of the jejunum is lined with simple columnar epithelium, which contains specialized cells for nutrient absorption.

Function of the Jejunum

The primary function of the jejunum is the absorption of nutrients from the digested food. This includes the absorption of carbohydrates, proteins, fats, vitamins, and minerals. The plicae circulares, villi, and microvilli all work together to maximize the surface area available for absorption, allowing for efficient uptake of nutrients into the bloodstream.

Key Points to Remember

The jejunum is the middle segment of the small intestine, responsible for nutrient absorption.
Plicae circulares, villi, and microvilli are structural features that enhance the absorptive capacity of the jejunum.
Functions of the jejunum include the absorption of carbohydrates, proteins, fats, vitamins, and minerals.
Understanding the structure and function of the jejunum is essential for comprehending the overall process of digestion and nutrient uptake in the human body.