The response of pulmonary arterioles to depressed alveolar oxygen tension. The vascular response shunts pulmonary blood flow away from alveoli that are under-ventilated, toward lung regions that are better ventilated, thus minimizing the effect of ventilation-perfusion inequalities in the lung.

Hertz – Unit of frequency; 1 Hz equals one cycle per second

Hypoxic hypoxia is commonly referred to as hypoxemic hypoxia (or relative deficiency in the bloodstream), but is described accurately as a condition of relative oxygen deficiency in the tissues caused by low arterial oxygen tension.

1) Term developed to describe a reduced possibility of developing a dermatological response to chemicals utilized in production of a given product. 2) Passage of the 200 person modified Draize test, as defined by the FDA & ASTM, reflects reduced contact dermatitis potential (Type IV) to the product.

Increased oxygenation via ventilator or Ambu bag.

Characterized by less than normal pressure or density. Applies to a solution with lower specific gravity than that of another solution taken as a reference.

An increase in the depth of breathing, with or without an increase in the rate of breathing.

As a surface disinfectant, used at the right concentration and pH is effective against most vegetative bacteria, fungi, enveloped and non-enveloped viruses as well as Mycobacterium tuberculosis and bacterial spores if solution remains at high concentration. It is inactivated by organic substances. For sporicidal concentration: 1 part household bleach to 9 parts water; approximately 5,000 ppm free chlorine – good for 24 hours, then need to make fresh again.

Term used to describe an exaggerated response to a foreign substance (i.e., an antigen), which causes tissue damage in a host after repeated challenges, causing the individual to become sensitized. Type I hypersensitivity mediated by IgE antibodies and produces an immediate (minutes to an hour) reaction; e.g. peanut, latex, penicillin allergy. Type IV hypersensitivity is cell mediated and response requires 24-72 hours for the rash-like symptoms to fully express, skin transplants to be rejected, etc.

Location: promontory of sacrum. Serves pelvic plexus and viscera of pelvis. Contains sympathetic elements.