________ cells enable the immune system to respond more quickly if the same antigen is encountered a second time.
Fill in the blank(s) with the appropriate word(s).
Memory
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The active process that occurs when materials enter the digestive tract via the mouth is __________.
a. absorption b. excretion c. secretion d. ingestion
Some species of fish are able to produce electrical discharges. These fish
A) Produce discharges continuously from their electric organ. B) Produce only weak discharges of approximately 1 volt. C) Have a specialized electric organ of highly derived nerve and muscle cells known as electrocytes. D) Are known as strongly electric fish.
The average volume of semen is 2.75 L, ranging from 2 to 6 L, the higher volumes following periods of elevated sexual activity
a. True b. False Indicate whether the statement is true or false
Which of the following cells has up to 50 nuclei and a ruffled border?
A. Osteoblast B. Osteoclast C. Osteocyte D. Macrophage E. Osteogenic cell