The chemical mediators, which stimulate the production of neutrophils, eosinophils, and basophils, cause fever, and increase T cell sensitivity, are termed
A) interleukins.
B) interferons.
C) tumor necrosis factors.
D) phagocytic regulators.
E) colony-stimulating factors.
C) tumor necrosis factors.
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Which of the following statements about sperm is not true?
A) They contain very little cytoplasm or stored nutrients. B) They are sluggish in an alkaline environment. C) The acrosome is produced by the Golgi apparatus and contains hydrolytic enzymes. D) The sperm midpiece consists of mitochondria spiraled tightly around the contractile filaments of the tail.
Sunlight, ultraviolet light, and X rays all darken skin because they increase blood flow to
the dermis. Indicate whether the statement is true or false
Most of the energy stored in the body is in the form of glycogen
Indicate whether the statement is true or false.
The ________ directs blood from the ________ of the heart to the lungs. Backflow of blood to the heart is prevented by ________. Blood from the lungs returns to the heart via ________.
Fill in the blank(s) with the appropriate word(s).