Muscle fibers differ from "typical cells" in that muscle fibers
A) lack a plasma membrane.
B) have many nuclei.
C) are very small.
D) lack mitochondria.
E) All of the answers are correct.
Answer: B
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The vessels that deliver oxygen to the tissues of the body are part of the __________.
Fill in the blank(s) with the appropriate word(s).
Which is not correct regarding the thymus gland?
A. It is fully encapsulated by connective tissue. B. Each thymic lobe is subdivided into lobules. C. It is a bilobed organ located in the mediastinum. D. Its thymic corpuscles are the site of T-lymphocyte maturation. E. It reaches its maximum size at puberty, then regresses.
Which of the following is an active proteolytic enzyme?
a. pepsinogen b. chymotrypsinogen c. procarboxypeptidase d. secretin e. None of the above
The amount of air that can be forcibly taken in after normally inhaling is called ________
A) Residual volume B) Expiratory reserve volume C) Inspiratory reserve volume D) Tidal volume