The Physical Barriers That Are Part of the Immune System

question 104

Multiple Choice

The physical barriers that are part of the immune system function by having _________.

• A) tightly packed epithelial cells that prevent pathogens from entering tissues
• B) mucus that traps pathogens and other foreign substances
• C) cilia that sweep mucus out of the throat
• D) All of the answers are correct.
• E) None of the answers are correct.

---

Definitions:

Melatonin

A hormone, secreted by the pineal gland, that is involved in the regulation of daily biological rhythms.

Oxytocin

A hormone and neurotransmitter involved in childbirth and lactation, also known as the "love hormone," it plays a role in social bonding, sexual reproduction, and during and after childbirth.

Prefrontal Cortex

The part of the frontal lobes of the brain that is involved in decision making, problem-solving, control of purposeful behaviors, consciousness, and emotions.

Right Hemisphere

The half of the brain that is typically associated with spatial abilities, face recognition, visual imagery, and music perception.