The vertebral canal is widest in the
A. cervical region.
B. thoracic region.
C. lumbar region.
D. The dimensions do not vary from one region to another.
Answer: A
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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 is not an action of interferon?
A. It stimulates macrophages and NK cells to destroy virus-infected cells. B. It triggers synthesis of enzymes that destroy viral nucleic acids. C. It signals the immune system that the secreting cell is part of the body and so should not be attacked. D. It binds to receptors of neighboring cells preventing them from being infected.
Regarding the cardiovascular system, the main role(s) of the kidneys is/are to
A) minimize fluid loss from the blood and therefore maintain blood pressure and reduce blood volume and therefore reduce blood pressure. B) minimize fluid loss from the blood and therefore maintain blood pressure. C) reduce blood volume and therefore reduce blood pressure. D) restore lost fluid to the blood and therefore raise blood pressure. E) restore lost fluid to the blood and therefore raise blood pressure and minimize fluid loss from the blood and therefore maintain blood pressure.
Predict the movement of water between the cytosol of a cell and hypertonic plasma
What will be an ideal response?