Changes in the immune system that accompany aging include all of the following except
A) T cells becoming less responsive to antigens.
B) fewer cytotoxic T cells responding to infections.
C) decreased numbers of T helper cells.
D) more efficient secondary responses.
E) B cells are less responsive.
D
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Describe the roles of the natriuretic peptides
A) The roles of these peptides are to trigger responses whose combined effects are to increase blood volume and increase blood pressure. B) The roles of these peptides are to trigger responses whose combined effects are to increase blood volume and decrease blood pressure. C) The roles of these peptides are to trigger responses whose combined effects are to decrease blood volume and increase blood pressure. D) The roles of these peptides are to trigger responses whose combined effects are to decrease blood volume and decrease blood pressure. E) The roles of these peptides are to trigger responses whose combined effects are complementary to angiotensin II.
As you proceed from the head down the vertebral column,
A) the vertebrae become smaller and lighter. B) vertebral bodies become absent. C) the transverse foramina become more evident. D) the vertebrae become larger and heavier. E) more odontoid processes become evident.
Which feature enables epithelial tissue to serve as a protective layer in areas subject to abrasion and/or erosion?
A. It rests on a basement membrane. B. Its cells undergo rapid mitosis. C. It is avascular. D. It secretes substances. E. It is well supplied with nerves.
connective tissue structures that attach bone to muscle are called ________________.
Fill in the blank(s) with the appropriate word(s).