Explain why blood is classified as a connective tissue.
What will be an ideal response?
It has both solid (cells) and liquid (extracellular) components. The formed elements (cells) are suspended in a nonliving fluid matrix (plasma). Blood develops from mesenchyme.
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The surface of immune system ____ contains receptors for a variety of central nervous system chemical messengers.
A. sex hormones growth B. hormones catecholamines C. lymphocytes D. antibodies
The outermost layer of a blood vessel, which is very thick, composed chiefly of collagen fibers, with scattered bands of elastic fibers is the
A) external elastic membrane. B) intima. C) internal elastic membrane. D) adventitia. E) media.
The irregular ridges and folds of the ventricles are called the ____
a. trabeculae carneae b. auricles c. sulci d. gyri
Which of these connect the cytosol of adjacent cells?
a. gap junctions b. tight junctions c. demosomes d. basement membrane