More than 40 million students have trusted Schaum's to help them succeed in the classroom and on exams. Answers for Critical Thinking Questions. The first is a Merkel cell, which functions as a receptor and is responsible for stimulating sensory nerves that the brain perceives as touch. Skin and its accessory structures. Identify the components of the integumentary system. Integumentary system questions and answers. Men tend to accumulate fat in different areas (neck, arms, lower back, and abdomen) than do women (breasts, hips, thighs, and buttocks). The hypodermis consists of well-vascularized, loose, areolar connective tissue and abundant adipose tissue, which functions as a mode of fat storage and provides insulation and cushioning for the integument.
Collagen fibers provide structure and tensile strength, with strands of collagen extending into both the papillary layer and the hypodermis. Deeper layer of the dermis; it has a reticulated appearance due to the presence of abundant collagen and elastin fibers. Integumentary system worksheet answers pdf.fr. Treatment of this disorder usually involves addressing the symptoms, such as limiting UV light exposure to the skin and eyes. A total lack of melanin is caused by the genetic disorder called albinism (See Disorders of the…Integumentary System below). The cells in this layer can still be anchored to each other by desmosomes which is why the peeling that occurs with a sunburn peels the damaged epidermal layers in one sheet. Dark-skinned individuals can also get sunburns, but are more protected than are pale-skinned individuals.
Cells of the epidermis derive from stem cells of the stratum basale. The amount of melanin produced, and therefore UV protection, is directly correlated with the amount of sunlight exposure. Eumelanin exists as black and brown, whereas pheomelanin provides a red color. Elastin fibers provide some elasticity to the skin, enabling movement. The skin and its accessory structures make up the integumentary system, which provides the body with overall protection.
Deepest layer of the epidermis, made of epidermal stem cells. Therefore, its accuracy as a health indicator can be called into question in individuals who are extremely physically fit. In addition, students will learn how each part helps the human body. Each Outline presents all the essential course information in an easy-to-follow, topic-by-topic format. Type of structural protein that gives skin, hair, and nails its hard, water-resistant properties. The keratinocytes that compose the stratum lucidum are dead and flattened (see Figure 5.
View this animation to learn more about layers of the skin. This superficial layer of the dermis projects into the stratum basale of the epidermis to form finger-like dermal papillae (see Figure 5. Melanin gives hair and skin its color, and also helps protect the DNA in the nuclei of living cells of the epidermis from ultraviolet (UV) radiation damage. A basal cell is a cuboidal-shaped stem cell that is a precursor of the keratinocytes of the epidermis. It does not have any blood vessels within it (i. e., it is avascular).
You can expand it or make it of UseAll rights reserved by Humerus TeacherThis product is intended for use by the original purchaser only. Genetic disorder that affects the skin, in which there is no melanin production. In addition, collagen binds water to keep the skin hydrated. Exposure to UV irradiation stimulates the melanocytes to produce and secrete more melanin. They also tend to be more sensitive to light and have vision problems due to the lack of pigmentation on the retinal wall. As the name suggests, the stratum spinosum is spiny in appearance due to the protruding cell processes that join the cells via a structure called a desmosome. Cells in this layer are shed periodically and are replaced by cells pushed up from the stratum granulosum (or stratum lucidum in the case of the palms and soles of feet). This ABC video follows the story of a pair of fraternal African-American twins, one of whom is albino.
The keratinocytes in the stratum spinosum begin the synthesis of keratin and release a water-repelling glycolipid that helps prevent water loss from the body, making the skin relatively waterproof. Connective tissue connecting the integument to the underlying bone and muscle. The stratum spinosum is composed of eight to 10 layers of keratinocytes, formed as a result of cell division in the stratum basale (Figure 5. Tumors of the pituitary gland can result in the secretion of large amounts of melanocyte-stimulating hormone (MSH), which results in a darkening of the skin. In a growing fetus, fingerprints form where the cells of the stratum basale of the epidermis meets the papillae of the underlying dermal layer (papillary layer), resulting in the formation of the ridges on your fingers that you recognize as fingerprints. Muscular System Puzzle. Link] These cells have desmosomes, which give the cells their spiny appearance. View the University of Michigan WebScope at? The defect is primarily due to the inability of melanocytes to produce melanin. This Crossword Puzzle Set of 10 package is great for vocabulary building and is used at the end of each one of my units as a post test activity.
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