A signal molecule that is secreted into the external environment, instead of into the blood, is called a(n) ________.
Fill in the blank(s) with the appropriate word(s).
ectohormone or pheromone
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The life span of an erythrocyte is about ________ days.
A. 120 B. 60 C. 360 D. 10 E. 30
The tissues of Cnidarians are termed _____________ because they are derived from two embryonic body layers
Fill in the blank with the correct word.
Weakness in all four limbs is called ________________________________________ or ________________________________________
Fill in the blank(s) with correct word
Why is it important to use an antibiotic other than ampicillin in the treatment of bacterial pneumonia?
A. Because antibiotics, such as ampicillin destroy the cell walls of cardiac muscle cells. B. Because antibiotics, such as ampicillin cause the cells lining blood vessels to endocytose bacteria and deposit them in cardiac muscle tissue. C. Because antibiotics, such as ampicillin are not effective in the treatment of bacterial pneumonia. D. Because antibiotics, such as ampicillin destroy the cell walls of bacteria which cause a toxin to be released that will destroy cardiac muscle cells.