Blood is a fluid connective tissue that plays a vital role in transporting oxygen, nutrients, hormones, and waste products throughout the body. It consists of various cellular components suspended in a liquid matrix called plasma. In terms of its composition and function, blood bears certain similarities to other connective tissues.

Matrix:
- The matrix is the non-living component of a connective tissue that surrounds the cells. In the case of blood, the matrix is the plasma, which makes up about 55% of the total blood volume. Plasma is a yellowish fluid that contains water, electrolytes, proteins, hormones, and waste products. It provides a medium for the transportation of substances and helps maintain the pH and temperature of the body.

Fibroblasts:
- Fibroblasts are specialized cells found in various connective tissues that produce and maintain the extracellular matrix. However, they are not present in blood. Instead, blood contains other types of cells, such as red blood cells (erythrocytes), white blood cells (leukocytes), and platelets (thrombocytes), which perform specific functions related to immunity, oxygen transport, and blood clotting.

Macrophages:
- Macrophages are a type of white blood cell that plays a crucial role in the immune response. They are responsible for engulfing and digesting foreign particles, cellular debris, and pathogens. While macrophages are present in other connective tissues, such as lymph nodes and spleen, they are not abundant in the blood itself. However, monocytes, which are precursor cells of macrophages, are present in the blood and can differentiate into macrophages when they migrate to tissues.

Fibers:
- Connective tissues typically contain fibers, such as collagen, elastin, and reticular fibers, which provide structural support and resilience. However, blood does not contain these fibers. Instead, it relies on platelets and clotting factors to form temporary clots and prevent excessive bleeding in response to injury.

In summary, blood is a fluid connective tissue that shares some similarities with other connective tissues in having a matrix (plasma). However, it lacks fibroblasts, contains monocytes (precursor cells of macrophages) but not macrophages themselves, and does not have the typical fibers found in other connective tissues.

Matrix of blood is called plasma. Matrix is present in all connective tissues.