A patient presents to the emergency room with a bad headache and extreme fatigue. The patient is diagnosed with a purely metabolic acidosis as ,thankfully, her respiratory system is compensating. Given the patient’s arterial blood gas results (shown below), which of the following values is most likely to be the patient’s PaCO2 in the ED?   Arterial Blood Gas Results pH 7.32 pO2 98 mmHg HCO3- 14 mEq/L  

Upon acute ascent to high altitude, the first physiologic response is which of the following?

Identify the primary lymphoid organs.

Select all of the immunoglobulin characteristics below that describe IgG

The ability of an antigen to elicit an antibody response is termed _______________________.

Select all of the cells below that serve as antigen presenting cells.

MHC I antigens are found on:

Exogeneous antigens processed through a processing cell will use MHC II proteins for displaying the antigens to the immune response.

Which of the following is a powerful substance released after the activation of the complement system that will attract leukocytes and macrophages to the site?

The main barrier to prevent invasion by foreign particles is: