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Blood is a _________.
1. Connective tissue
2. Muscular tissue
3. Epithelial tissue
4. None of these

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Correct Answer - Option 1 : Connective tissue

The correct answer is Connective tissue.

  • Blood is a connective tissue that has a fluid matrix, called plasma, and no fibers. Erythrocytes (red blood cells), the predominant cell type, are involved in the transport of oxygen and carbon dioxide.
  • Blood is considered a connective tissue for two basic reasons:
  • Embryologically, it has the same origin (mesodermal) as do the other connective tissue types and
  • Blood connects the body systems together bringing the needed oxygen, nutrients, hormones, and other signaling molecules, and removing the wastes. In circulating blood two different cell types are found: enucleated erythrocytes or red blood cells and nucleated leukocytes or white blood cells.

  • Erythrocytes (red blood cells): RBCs are small (7 um) cells lacking a nucleus. They stain red with eosin and due to their concave shape have a lighter staining center. 
  • Leukocytes (white blood cells): The WBCs have divided into two groups: (1) granular leukocytes, containing distinctive cytoplasmic granules, including neutrophils, eosinophils, and basophils, and (2) agranular leukocytes, without granules, including monocytes and lymphocytes.
  • Types of Animal Tissues:
    • Connective Tissues: They are the group of tissues made up of cells separated by non-living material, called an extracellular matrix. This tissue provides shape to the different organs and maintains their positions. For example, blood, bone, tendon, adipose, ligament, and areolar tissues. 
    • Muscle Tissue: They are involved in producing force and generating motion, either for the locomotion or for other body movements within internal organs.
    • Nervous Tissue: They are the main tissue components of the brain and spinal cord in the central nervous system. While, in the peripheral nervous system, the neural tissue forms the cranial nerves and spinal nerves.
    • Epithelial Tissue: They are formed by cells that cover the external parts of the body organs and line the organ surfaces such as the surface of the skin,  the reproductive tract, the airways, and the inner lining of the digestive tract.

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