Question

each cortical nodule is composed of packed lymphocytes that surround a less dense area called a

○ germ center.
○ trabecula.
○ lymph node.
○ germinal center.

question 104 0.25 pts

which substance can destroy pathogens by lowering the ph to a level at which they cannot function?

○ hydrochloric acid
○ mucus
○ enzymes
○ sebum

question 105 0.25 pts

the lymph nodes located in the groin are called the:

○ inguinal lymph nodes.
○ axillary lymph nodes.
○ submaxillary group.
○ submental group.

Explanation:

First Question (Cortical Nodule Structure)

Cortical nodules in lymph nodes have packed lymphocytes surrounding a less dense germinal center (also called germ center, but "germinal center" is the more precise term here). Trabecula is connective tissue, lymph node is the organ, so the correct answer is the option with germinal center.

Hydrochloric acid (in stomach) has low pH, killing pathogens. Mucus traps, enzymes (like lysozyme) break cell walls, sebum has fatty acids but HCl lowers pH. So the correct option is Hydrochloric acid.

Inguinal lymph nodes are in the groin. Axillary are under arms, submaxillary/submental are in neck. So the correct option is inguinal lymph nodes.

Answer:

D. germinal center.

Question 104 (Substance Destroying Pathogens by pH)