PhysiologyLesson 3 of 4 in the course The Integumentary System

Skin Barrier, Sensation, Thermoregulation, and Age-Related Changes

5 flashcards · 5 quiz questions · 5 match pairs · 5 fill-in sentences · English

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Summary

The skin and its accessory structures form a protective boundary between the body and the environment. They also allow the body to detect changes around it and respond to potential threats.

The skin is the body's first line of defense against environmental hazards, including wind, water, ultraviolet (UV) sunlight, abrasive materials, microbes, and harmful chemicals. Its outer surface helps shield the tissues and organs beneath it.

All flashcards

How does the stratum corneum help protect the body?
Keratin and glycolipids in this outer epidermal layer help limit water loss and resist environmental damage.
What is dermcidin?
A sweat-associated substance with antibiotic properties that helps deter microbial overgrowth on the skin.
What do Meissner and Pacinian corpuscles detect?
Meissner corpuscles respond to light touch; Pacinian corpuscles respond to vibration.
What does a hair root plexus detect?
This network of sensory nerve endings around a hair follicle detects hair movement and relays information toward the central nervous system.
Why can tattoos or piercings increase infection risk?
They breach the skin's protective barrier, creating a possible route for microbes to enter.

Quiz questions

  1. When the body is cold, what happens to dermal arterioles, and what is the effect?Answer: They constrict, reducing skin blood flow and limiting heat loss.
  2. Which organs convert cholecalciferol first to calcidiol and then to calcitriol?Answer: The liver, then the kidneys
  3. Which minerals does vitamin D help the body absorb?Answer: Calcium and phosphorus
  4. What age-related change can contribute to slower wound healing?Answer: Reduced regenerative capacity of the dermis
  5. Why may some older adults tolerate extreme heat less well?Answer: Sweat production may decline with age.

Based on Anatomy and Physiology 2e by J. Gordon Betts, Kelly A. Young, James A. Wise, Eddie Johnson, Brandon Poe, Dean H. Kruse, Oksana Korol, Jody E. Johnson, Mark Womble, Peter DeSaix (OpenStax), licensed CC BY 4.0. Adapted into a summary, flashcards and quizzes.

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