Tissue types and function · USMLE Step 1

Which of the following best explains why blood is classified as a type of connective tissue rather than a separate tissue type?

  1. Because its blood cells are epithelial in embryonic origin
  2. Because blood contains abundant collagen fibers and ground substance
  3. Because blood has a fluid matrix (plasma) with transport and support roles
  4. Because blood gives rise to contractile muscle fibers
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Correct answer: Because blood has a fluid matrix (plasma) with transport and support roles

Blood is considered a specialized form of connective tissue: its cells (red blood cells, leukocytes) are suspended in a liquid extracellular matrix (plasma), and it serves supportive and transport functions, aligning with the general definition of connective tissue.

Difficulty: Medium Question 17 of 22

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