Deep stretching should be done before a warm up or workout to increase one's flexibility. (points : 1)
true
false

Mucous membranes.. a. cover or line external surface of body. b. line internal body surfaces that are in contact with the environment. c. produce antibodies to combat infection. d. secrete sweat, which has antibacterial enzymes.

Bloodborn pathogens are infectious microorganisms carried by what?

The heart and lung are located in which cavity ? thoracic