Which of the following types of fire doors is usually held open by a fusible link and cannot be used to protect openings in walls that are required parts of a means of egress?

Signs and symptoms of polycystic kidney disease may include all of the following EXCEPT ___________

a. high blood pressure b. back or side pain c. abdominal pain d. nasal discharge

The first cervical vertebra is called the ________. 

Fill in the blank(s) with the appropriate word(s).