Atlas A – General Orientation to Human Anatomy Practice Exam 2026 - Free Human Anatomy Practice Questions and Study Guide

The primary function of serous membranes is to cushion and protect the organs within body cavities while also reducing friction. These membranes consist of a double layer, with the visceral layer adhering to the organs and the parietal layer lining the cavity walls. Between these layers is serous fluid, which acts as a lubricant, allowing organs to move smoothy against one another during bodily movements without causing irritation or damage. This lubrication is essential, especially in areas like the thoracic and abdominal cavities, where organs can expand and contract frequently.

In contrast, structural support of organs falls under different connective tissues rather than the role of serous membranes. While control of blood flow typically involves vascular structures and regulatory mechanisms, it is not a function of serous membranes. Additionally, hormone production and regulatory functions are typically performed by endocrine glands, not by serous membranes, which serve primarily a protective and cushioning role.