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Related Concept Videos

Hair Cells01:22

Hair Cells

45.3K
Hair cells are the sensory receptors of the auditory system—they transduce mechanical sound waves into electrical energy that the nervous system can understand. Hair cells are located in the organ of Corti within the cochlea of the inner ear, between the basilar and tectorial membranes. The actual sensory receptors are called inner hair cells. The outer hair cells serve other functions, such as sound amplification in the cochlea, and are not discussed in detail here.
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Free-falling Bodies: Example01:05

Free-falling Bodies: Example

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An object falling without any air resistance under the influence of gravitational force is said to be in free-fall. For free-falling bodies, the acceleration due to gravity is constant, irrespective of their mass. Free-fall is experienced not only by objects falling downward, but also by all objects whose motion is influenced by gravitational force alone. The dynamics of free-fall motion can be calculated using kinematic equations of motion, since free-fall acceleration is constant.
The...
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Free-falling Bodies: Introduction01:07

Free-falling Bodies: Introduction

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All objects, neglecting air resistance, fall with the same acceleration towards the Earth's center due to the force exerted by the Earth's gravity. This experimentally determined fact is unexpected because we are so accustomed to the effects of air resistance and friction that we expect light objects to fall slower than heavier ones. People believed that a heavier object had a greater acceleration when falling until Galileo Galilei (1564–1642) proved otherwise. We now know this is...
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Accessory Structures of the Skin: Hair and Hair Follicles01:16

Accessory Structures of the Skin: Hair and Hair Follicles

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Hair and hair follicles are integral components of the integumentary system. Hair is a filamentous structure composed mainly of a protein called keratin. It is found on the surface of the skin throughout the body, except for areas such as the palms of the hands and soles of the feet.
Hair is a keratinous filament growing out of the epidermis. It is primarily made of dead, keratinized cells. Hair strands originate at the epidermal penetration called the hair follicle. The hair shaft is the part...
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Accessory Structures of the Skin: Hair Growth and Types01:20

Accessory Structures of the Skin: Hair Growth and Types

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Hair growth begins with the production of keratinocytes by the basal cells of the hair bulb. As new cells are deposited at the hair bulb, the hair shaft is pushed through the follicle toward the surface. Keratinization is completed as the cells are pushed to the skin surface to form the shaft of hair that is externally visible. The external hair is completely dead and composed entirely of keratin. Hair can be cut or shaven without damaging the hair structure because the cut is superficial. Most...
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Definition and Measurement of Pressure: Atmospheric Pressure, Barometer, and Manometer02:57

Definition and Measurement of Pressure: Atmospheric Pressure, Barometer, and Manometer

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Gas pressure is caused by force exerted by gas molecules colliding with the surfaces of objects. Although the force of each collision is very small, any surface of an appreciable area experiences a large number of collisions in a short time, which can result in high pressure.
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Related Experiment Video

Updated: Feb 12, 2026

Collecting Hair Samples for Hair Cortisol Analysis in African Americans
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Published on: June 10, 2018

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[When hair starts to fall out].

Caroline de Lorenzi1, Sandrine Quenan1

  • 1Service de dermatologie et vénéréologie, HUG, 1211 Genève 14.

Revue Medicale Suisse
|March 29, 2018
PubMed
Summary

This paper reviews common hair loss causes to improve diagnosis and treatment. Understanding diverse hair loss mechanisms is key for effective patient management in dermatology and general practice.

Area of Science:

  • Dermatology
  • Trichology

Background:

  • Hair loss causes significant physical and psychological distress.
  • It is a frequent reason for consultations in primary care and dermatology.
  • Diverse etiologies can complicate diagnosis and delay management.

Purpose of the Study:

  • To describe the primary causes of hair loss.
  • To enhance the diagnostic process for hair loss.
  • To optimize the management of hair loss.

Main Methods:

  • Literature review of hair loss etiologies.
  • Analysis of diagnostic challenges.
  • Synthesis of treatment optimization strategies.

Main Results:

  • Identified diverse causes of hair loss.

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  • Highlighted diagnostic complexities.
  • Emphasized the need for understanding underlying mechanisms.

    • Conclusions:

    • Accurate diagnosis of hair loss is crucial for timely management.
    • Knowledge of hair loss causes and mechanisms improves patient outcomes.
    • This review aims to support clinicians in diagnosing and treating hair loss effectively.