Zoology 10th Edition by Stephen Miller,John Harley

Exercise 8

Simple epithelium can be classified as squamous, cuboidal, columnar, and pseudostratified. Connective tissue is classified as either loose or dense. Muscle cells are able to shorten or contract and change their length, which accomplishes movement. Nervous tissue is composed of neurons and neuroglia.
Why is blood considered a type of connective tissue?