Autoimmune diseases such as arthritis become more common as people get older. "Autoimmune" means that the immune system
A. protects itself.
B. no longer produces antibodies.
C. is incapable of initiating phagocytosis.
D. produces T cells but no B cells.
E. destroys the body's own tissues.
Answer: E
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The ________ is a "housekeeping function" that sweeps food remnants and bacteria out of the upper GI tract and into the large intestine.
Fill in the blank(s) with the appropriate word(s).
If you mixed a person's red blood cells with anti-B antibodies, and the red blood cells agglutinated, what could you conclude?
A. That the person's blood is Rh+ B. That the person has type AB blood C. That the person has type B blood D. That the person's red blood cell membranes contain antigen B E. That the person's red blood cell membranes contain antigen A
Rigor mortis affects skeletal muscles a few hours after death, due to
A. a decrease in ATP and increased permeability to calcium. B. an increase in ATP and decreased permeability to calcium. C. impulses that produce sustained contractions. D. an increase in ATP.
Why is blockage of a coronary artery such a serious threat to cardiac muscle?
A. Cardiomyocytes rely on a constant supply of calcium. B. Cardiomyocytes have abundant mitochondria and rely on a constant supply of oxygen. C. The myosin of cardiomyocytes is unique and requires abundant nutrients and oxygen. D. Cardiomyocytes have weak sarcolemmas that easily rupture. E. Cardiomyocytes are fast-twitch fibers.