Epithelial cells of the kidneys have pumps that drive the transcellular transport of sodium ions.


a. Is this epithelium likely to be simple or stratified? Why?

Verified step by step guidance

1. Consider the function of epithelial cells in the kidneys, which is primarily involved in absorption and secretion.
2. Recall that simple epithelium is typically involved in processes like absorption, secretion, and filtration, where a single layer of cells is sufficient.
3. Understand that stratified epithelium is generally found in areas requiring protection against abrasion, not typically involved in active transport processes.
4. Since the kidney's epithelial cells are involved in the active transport of sodium ions, a process requiring efficient and rapid exchange, a simple epithelium is more likely.
5. Conclude that the epithelium is likely to be simple because it facilitates efficient transcellular transport of ions, which is a characteristic of simple epithelial layers.

Key Concepts

Epithelial Tissue Types

Epithelial tissue is classified into two main types: simple and stratified. Simple epithelium consists of a single layer of cells, allowing for efficient absorption and secretion, while stratified epithelium has multiple layers, providing protection against abrasion. The type of epithelium is determined by its function and location in the body.

Transcellular Transport

Transcellular transport refers to the movement of substances across the epithelial cells, involving both passive and active mechanisms. In the case of sodium ions, active transport is often facilitated by pumps, such as the sodium-potassium ATPase, which helps maintain ion gradients essential for various physiological processes, including fluid balance and nerve function.

Kidney Function and Structure

The kidneys play a crucial role in filtering blood and regulating electrolyte balance, primarily through specialized epithelial cells in structures like the nephron. These cells are adapted for efficient transport of ions and water, which is vital for maintaining homeostasis. The presence of pumps for sodium ions indicates a need for a simple epithelium to facilitate rapid transport and absorption.