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During phagocytosis, the killing and destruction of pathogens takes place ___________. 

_________ are chemoreceptors in the nose that detect odors. 

Explain the difference between natural active immunity and natural passive immunity. 

Which of the following lymphatic organs shrinks as we age?

____________ serves as a storage site for calcium and phosphorus. 

Compare and contrast the second and third lines of defense. List two components of each line of defense. 

Which type of tissue is most likely to become cancerous? 

Which of the following is associated with the second line of defense?

Cells in ____________ have more mitochondria than other cells in the body. 

Which of the following is associated with the first line of defense?