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External respiration occurs in the lungs, and it is the first step in the journey of oxygen inside the body. When we inhale, oxygen enters our lungs and diffuses across the thin alveolar membrane. The alveoli are tiny, air-filled sacs that provide a vast surface area for gas exchange. Oxygen in the alveoli has a higher partial pressure (105 mmHg) than in the adjacent pulmonary capillaries (40 mmHg), establishing a pressure gradient. As a result, oxygen molecules move from the alveoli into the...
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Newton's first law states that a net external force causes a change in motion. External forces act on an object or system, originating outside of the object or system. In contrast, internal forces originate inside the system of interest and do not lead to any acceleration. In simpler words, internal forces are forces that act on one part of an object and are exerted by another part of the same object. External forces are forces that act on an object due to some other object. Therefore, when...
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Nails are one of the important accessory structures of the skin. They are hard, protective structures that cover the dorsal surface of the distal phalanges of fingers and toes. Nails are composed of specialized keratinized cells and serve various functions, including protection, sensation, and manual dexterity.
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Many cellular signals are hydrophilic and therefore cannot pass through the plasma membrane. However, small or hydrophobic signaling molecules can cross the hydrophobic core of the plasma membrane and bind to internal, or intracellular, receptors that reside within the cell. Many mammalian steroid hormones use this mechanism of cell signaling, as does nitric oxide (NO) gas.
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The work done by an external force on a particle changes its kinetic energy. However, internal forces must also be considered for a system of interacting particles. The potential energy formulation helps formulate the effect of internal forces. The net work done by an external force can be written in terms of the total change of mechanical energy, which includes both kinetic and potential energies.
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Nails: The External Protective Window to the Internal Milieu

R Gary Sibbald1, Elizabeth A Ayello

  • 1R. Gary Sibbald, MD, DSc (Hons), MEd, BSc, FRCPC (Med Derm), FAAD, MAPWCA, JM, is the co-Editor-in-Chief of Advances in Skin & Wound Care; Professor, Medicine and Public Health, University of Toronto, Toronto, Ontario, Canada; Director, International Interprofessional Wound Care Course & Masters of Science in Community Health (Prevention & Wound Care), Dalla Lana Faculty of Public Health, University of Toronto; Project Lead, Project ECHO Ontario Wound and Skin; and Investigator, Institute for Better Health, Trillium Health. Elizabeth A. Ayello, PhD, RN, CWON, ETN, MAPWCA, FAAN, is the co-Editor-in-Chief of Advances in Skin & Wound Care; Faculty, Excelsior College School of Nursing, Albany, New York; President, World Council of Enterostomal Therapists, President, Ayello Harris & Associates, Inc, Copake, New York; and President (1999), National Pressure Ulcer Advisory Panel.

Advances in Skin & Wound Care
|July 24, 2019
PubMed
Summary

No abstract available in PubMed .

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