____ provides positive airway pressure during the entire spontaneous breath and it does not include any mechanical breaths.

The swift, strong response of the immune system to repeated exposures to an antigen is called the _______________ _______________ _______________

Fill in the blank(s) with correct word

Contributing factors to the development of heat illnesses include all of the following except:

a. high air temperature b. vigorous exercise c. high humidity d. increased fluid intake