Explain how the four major tissue types work together in the human arm.

The epithelial tissue- covers the body surface and forms the lining for most internal cavities.
Connective tissue- provide a variety of functions including support and protection.
Muscle tissue: 
skeletal-voluntary type of muscle tissue that is used in the contraction of skeletal parts. 
smooth- found in the wall of internal organs and blood vessels.
cardiac- found only in the walls of the heart and is involuntary in nature. 

20 times a minute is usually the average respritory rate of an adult. additionally the patient is breathing on his own, is clearly maintaining his airway, and is intaking a sufficient amount of air. you shouldn't use a bag valve mask, cpap, or other form of positive pressure ventilation, unless the patient has lost control of his airway, and is not breathing (apneic) or has rapid breathing or slow and shallow respirations. this patient would most likely and should be put on an non-rebreather mask or nrb attached to 100% high flow oxygen at 15 l/min. don't use a nasal cannula, as the amount of oxygen it provides is limited with a rate of 6 l/min.