Personal protective equipment is unnecessary when providing first aid.

Scientists who study the anatomy of the systems in the human body focus their studies on

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.

Choose thyroid, parathyroid, or the adrenal gland and choose one disease affecting this part of the en-docrine system.