Electrolysis Practice Exam

Which of the following are considered defensive forces against infection in the body?

1. Platelets and plasma

2. Red blood cells

3. White blood cells, body secretions, unbroken skin

4. Enzymes and hormones

The correct answer is: White blood cells, body secretions, unbroken skin

The choice highlighting white blood cells, body secretions, and unbroken skin accurately identifies key components of the body's defense mechanism against infections. White blood cells, or leukocytes, function as the primary agents of the immune response, actively seeking and eliminating pathogens such as bacteria and viruses. Body secretions, such as mucus and saliva, contain antimicrobial properties that help trap and neutralize harmful microorganisms. Additionally, unbroken skin serves as a physical barrier, preventing pathogens from entering the body in the first place. The other options mention elements that do play important roles in the body’s functioning but are not primarily focused on the defense against infection in the same comprehensive manner. For instance, platelets and plasma are vital for blood clotting and transport of nutrients, while red blood cells are responsible for transporting oxygen. Enzymes and hormones have diverse roles in metabolism and regulatory functions, but they do not directly contribute to the immune defense system in the same way that the highlighted components do. Therefore, the accurate representation of the body's defensive forces against infections is found in the third choice.