20 .Regarding connective tissues, all of the following is true except A .Blood is regarded as a connective tissue. b. There is 5 types of muscles. c. fibroblast is responsible for secretion of...

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Extracted text: 20 .Regarding connective tissues, all of the following is true except A .Blood is regarded as a connective tissue. b. There is 5 types of muscles. c. fibroblast is responsible for secretion of collagen fibers. D.Macrophages engulf tissue debris and foreign materials and bacteria. 21 .Regarding muscles, which is false?