Question

Larry is taking a walk in the park. The pollen in the air makes him sneeze constantly. What line of defense is his immune system exhibiting?
A.) First line of defense
B.) Second line of defense
C.) Third line of defense
D.) Fourth line of defense

Answer 1

Larry is taking a walk in the park. The pollen in the air makes him sneeze constantly. The line of defense that is his immune system exhibiting is that of "(A) first line of defense." There are only 3 lines of defense in the immune system. The first line of defense are a combination of physical and chemical barriers that prevent all types of foreign agents from penetrating the outer layer of the body. In this case, it is the nasal cavity.

Answer 2

Correct answer choice is:

A.) First line of defense

Explanation:

The immune system can be divided into three basic lines of defense against pathogenic infection. The first line of defense (or exterior defense mode) involves physical and chemical restraints that are perpetually willing and equipped to protect the body from germs. These contain your skin, cracks, excretion, cilia, belly acid, urine flow, 'friendly' bacteria and white blood cells known as neutrophils.