Which statement about blood is true?

Which statement about blood is true?

• A. Blood is a muscle tissue
• B. Blood is a connective tissue
• C. Blood is a nervous tissue
• D. Blood is an epithelial tissue

Answer: (B)

The idea being tested is how tissues are classified by their composition. Blood is a connective tissue because its cells (red and white blood cells, platelets) are suspended in a fluid extracellular matrix called plasma. This setup—cells embedded in an extracellular matrix—defines connective tissue, and blood even though it circulates as a liquid, originates from mesenchyme and performs transport and protection roles across the body. In contrast, muscle tissue is built for contraction and organized into fibers, nervous tissue centers on signaling cells (neurons) with supporting cells, and epithelial tissue forms coverings and linings. None of those have the cells suspended in a fluid matrix that circulates throughout the body like blood does. So the statement that blood is a connective tissue is the accurate one.

The idea being tested is how tissues are classified by their composition. Blood is a connective tissue because its cells (red and white blood cells, platelets) are suspended in a fluid extracellular matrix called plasma. This setup—cells embedded in an extracellular matrix—defines connective tissue, and blood even though it circulates as a liquid, originates from mesenchyme and performs transport and protection roles across the body.

In contrast, muscle tissue is built for contraction and organized into fibers, nervous tissue centers on signaling cells (neurons) with supporting cells, and epithelial tissue forms coverings and linings. None of those have the cells suspended in a fluid matrix that circulates throughout the body like blood does. So the statement that blood is a connective tissue is the accurate one.