Which of the following is true regarding B-cells?

_____________ consists of the trachea, bronchi, bronchioles, and alveoli.

______________ carry messages between neurons and other cells. 

Following ovulation, the ruptured follicle in the ovary undergoes changes to become the __________ and secretes hormones. 

Matching: Match each term with its description. 

True or False: The testes are suspended outside of the abdominal cavity because proper sperm development occurs below normal body temperature. 

 Upon activation, B-cells will divide to form _________. 

__________ helps nerve impulses travel faster on long axons. 

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

Which statement regarding antibodies is correct?