Powerful peristaltic contractions that occur a few times each day in the colon are called
A) segmentation.
B) pendular movements.
C) haustral churning.
D) defecation.
E) mass movements.
E
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What electrolyte does the heart rely on most in order to keep a rhythmic beat?
a. potassium b. phosphorus c. magnesium d. iron e. sodium
The ________ secretes several hormones that stimulate the development of lymphatic organs and regulates development and activity of T cells (white blood cells).
A. spleen B. thymus C. thyroid D. adrenal gland E. parathyroid
The human immunodeficiency virus (HIV) is able to cause widespread immunodeficiency because ________.
A. the HIV virus blocks the activation of the complement system B. the HIV virus interferes with activation of both B cells and T cells C. the HIV virus infiltrates the cells responsible for innate immunity, the first line of defense against pathogens D. through infection of T cells, HIV prevents the product of antibodies against the virus
Which of the following statements about blood clotting is FALSE?
A. It is a result of a cascade of enzyme activation. B. It requires the presence of erythrocytes. C. It is the formation of a thrombus. D. It occurs after formation of a platelet plug in a damaged vessel. E. It involves positive feedback by thrombin.