Click card to see definition . Blood vessels that supply the capillaries of the papillary region are seen running through the reticular layer. Due to the absorptive capabilities of skin, the cells comprising the outermost 0.25–0.40 mm of the skin can be supplied by external oxygen rather than via the underlying capillary network. Vitamin D refers to a group of fat-soluble steroids responsible for increasing intestinal absorption of calcium, iron, magnesium, phosphate, and zinc. The integumentary system consists of the skin, hair, nails, the subcutaneous tissue below the skin, and assorted glands.The most obvious function of the integumentary system is the protection that the skin gives to underlying tissues. The dermis is the layer of skin beneath the epidermis that consists of connective tissue and cushions the body from stress and strain. The papillary region is composed of loose areolar connective tissue. The integumentary system is an organ system consisting of the skin, hair, nails, and exocrine glands. integumentary system synonyms, integumentary system pronunciation, integumentary system translation, English dictionary definition of integumentary system. Why do athletes and people in tropical climates often have white deposits on their clothes? They are usually seen with ring-shaped or scaly rashes, redness, itching, blisters or with the thickening of skin. Somatosensory receptors and nociceptors are important components of this organ system that serve as warning sensors, allowing the body to move away from noxious stimuli. (adsbygoogle = window.adsbygoogle || []).push({}); The skin provides an overlaying protective barrier from the environment and pathogens while contributing to the adaptive immune system. Vitamin D from the diet or that is synthesized by the body is biologically inactive; activation requires enzymatic conversion in the liver and kidney. Vitamin D3 is made in the skin when the 7-dehydrocholesterol reacts with ultraviolet light of UVB type at wavelengths between 280 and 315 nm, with peak synthesis occurring between 295 and 297 nm. Beneath this, the dermis comprises two sections, the papillary and reticular layers, and contains connective tissues, vessels, glands, follicles, hair roots, sensory nerve endings, and muscular tissue. The body will also limit or stop the process of sweating to minimize any evaporative heat loss. The first way involves the abundance of blood vessels found in the dermis, the middle layer of the skin. IN humans the integumentary system includes the skin – a thickened keratinized epithelium made of multiple layers of cells that is largely impervious to water. The integumentary system helps regulate body temperature through its tight association with the sympathetic nervous system, the division of the nervous system involved in our fight-or-flight responses. These protein fibers give the dermis its typical properties of strength, extensibility, and elasticity. Together, these two layers form the largest organ in the body, with a surface area of nearly 2 square meters. The integumentary system has multiple roles in homeostasis, including protection, temperature regulation, sensory reception, biochemical synthesis, and absorption. On the other hand, goosebumps arising from the contraction of arrector pili muscles can keep the body warm, especially in hairy mammals. The deepest layer is the hypodermis, which is primarily made up of adipose tissue. Langerhans cells in the skin also contribute to protection as they are part of the adaptive immune system. The skin is an incredibly large organ. It also contains specialized cells that secrete melanin to protect the body from the carcinogenic effects of UV rays and cells that have an immune function. The average person’s skin weighs 10 pounds and has a surface area of almost 20 square feet. The integumentary system distinguishes, separates, and protects the organism from its surroundings, but also plays a key metabolic function, as the major region for vitamin D production. The integumentary system protects the body’s internal living tissues and organs, protects against invasion by infectious organism, and protects the body from dehydration. This is named for its fingerlike projections called papillae, that extend toward the epidermis and contain terminal networks of blood capillaries. Control of the blood supply to the dermis forms part of the body’s thermoregulatory capacity. The receptive field—the region in which a receptor can sense an effect—can vary from small to large. It consists of multiple layers of terminally differentiated keratinocytes that are also called corneocytes. The skin assists in homeostasis (keeping different aspects of the body constant, e.g., temperature). There are numerous secretory glands present in the skin which secrete a large range of distinct fluids. Retrieved from https://biologydictionary.net/integumentary-system/. The integumentary system has multiple roles in maintaining the body's equilibrium. The sebaceous glands secrete an oily/waxy matter called sebum to lubricate and waterproof the skin and hair of mammals. This layer also cushions underlying tissues and protects them from desiccation. While acne only causes mild discomfort, at the other end of the spectrum are diseases like necrotizing fasciitis, which can be deadly even with appropriate treatment. If the body must cool down, the body vasodilates these blood vessels. Psoriasis is an autoimmune disorder and albinism arises from a complete lack of pigments on the skin. The integumentary system functions in thermoregulation—the ability of an organism to keep its body temperature within certain boundaries—even when the surrounding temperature is very different. All body systems work in an interconnected manner to maintain the internal conditions essential to the function of the body. The skin can also be subjected to genetic disorders like psoriasis or albinism. Finally, the integumentary system contains resident immune cells that are adept at clearing minor infections. All body systems work in an interconnected manner to maintain the internal conditions essential to the function of the body.
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