7.1 - Anatomy of the Integumentary System.pdf - 8/4/2020...

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8/4/20207.1: Anatomy of the Integumentary System: Essential Human Anatomy and Physiology I with Lab- Bowman1/107.1: Anatomy of the IntegumentarySystemNotice:To optimize your learning in this course, we advise that you complete the labs and modulesas indicated in the BIOD 151 Lab Schedule.Introduction to the Integumentary SystemThe integumentary systemis comprised of theskin, hair, and nails.Skinis the largest organ of thebody. It is made up of theepidermis(outer layer),dermis(middle layer), and thehypodermis(inner, also calledsubcutaneoustissue layer). SeeFigure 7.1below to see the three layers of theskin. Skin cells absorb ultraviolet radiation to produce vitamin D, which is used to promote bonedevelopment. The integumentary system contains the sensory receptors and glands used forprotection of the skin and underlying tissues. The integumentary system plays an important role inprotecting internal organs from extreme temperature changes as well as pathogenic (disease-causing) microorganisms. If the integumentary system is damaged and microbes or foreign objectsmake their way into the body, it is thelymphatic systemthat is responsible for mounting the attack todefend the body’s internal environment.
8/4/20207.1: Anatomy of the Integumentary System: Essential Human Anatomy and Physiology I with Lab- Bowman2/10Figure 7.1 The three layers of the skin: epidermis, dermis, and hypodermis.The epidermis isadhered to the basement membrane (highlighted in blue).Sensory OrgansThe skin contains several types of sense organs, each one specialized to detect a certain type ofsensory input(Figure 7.2).Merkel’s cellsandMeissner's corpusclesaremechanoreceptorsthatdetect mechanical sensory information in the form of light touch and vibration.Nociceptorsdetectpain, such as from a pin prick.Pacinian corpusclesdetect the mechanical sensory information ofpressure applied to the skin.Thermoreceptorsdetect hot and cold. Sensory organs embedded inthe skin are designed to detect sensory information and then to relay that information to the brain.The brain then interprets the information to determine an appropriate response.
8/4/20207.1: Anatomy of the Integumentary System: Essential Human Anatomy and Physiology I with Lab- Bowman3/10Figure 7.2 Sensory organs embedded within the layers of the skinGlandsRecallendocrine glandssecretehormones,which are secreted in the bloodstream for body-widedistribution.Exocrine glandscontain secretions released through aduct(opening) into an epithelialsurface or lining. Exocrine gland secretions can also release their contents onto the surface of the

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Term
Spring
Professor
Rebekah Stepp
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