Most ulcers that were previously believed to be caused by emotional stress and spicy foods may actually be caused by _____.?
A) ?poor nutrition
B) ?bacteria
C) ?a weakened immune system
D) ?viruses
A
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The normal rhythm of the heart is called the _____________________________
Fill in the blank(s) with correct word
The ______________________________ contain a liquid and delicate hairlike cells that bend when the liquid is set in motion by movement of the head or body.?
Fill in the blank(s) with correct word
Which of the following statements regarding the lymphoid organs is NOT true?
A. The primary lymphoid organs are the bone marrow and thymus. B. The thymus secretes protein hormones, collectively called thymopoietins. C. Large numbers of macrophages and lymphocytes are found in the lymph nodes and spleen. D. The tonsils contain lymphocytes, macrophages, and dendritic cells that respond to microbes in food. E. Once a lymphocyte reaches a secondary lymphoid organ, it remains there for its lifetime.
Reproductive cells are called
A) meiosis. B) gametes. C) fertilization. D) zygotes. E) None of the answers are correct.