Anatomy Practice Exam

How do connective tissues primarily differ from other types of tissues?

1. They have a dense cellular organization

2. They are highly vascularized

3. They contain sparse populations of cells in extracellular matrices

4. They mainly function in generating electrical impulses

The correct answer is: They contain sparse populations of cells in extracellular matrices

Connective tissues are characterized by having a sparse population of cells relative to the abundant extracellular matrix that surrounds them. This extracellular matrix is composed of protein fibers and ground substance, which provide structural support and help to anchor cells. Unlike epithelial tissues, which are densely packed with cells, or muscle and nervous tissues that have specific cellular arrangements for their functions, connective tissues feature a diversity of cell types and fibrous components tailored to their specific supportive roles. The extracellular matrix in connective tissues plays a critical role in determining their properties and functionality. For example, the presence of collagen fibers provides tensile strength, while elastin fibers allow for elasticity. This structural framework is essential for connecting and supporting other tissues and organs in the body. Other options do not accurately capture the distinctive attributes that set connective tissues apart. For instance, while some connective tissues can be vascularized—like loose connective tissue—this isn't a defining characteristic of all connective tissues. Likewise, they do not primarily function in generating electrical impulses, which is a role carried out by nervous tissue. Dense cellular organization is also typical of many other tissues, but connective tissues are noted specifically for their sparse cellular arrangement.