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As new keratinocytes are produced atop the stratum basale, the keratinocytes of the stratum spinosum are pushed into the stratum granulosum. Link] These cells do not have nuclei, so you can deduce that they are dead. In vitiligo, the melanocytes in certain areas lose their ability to produce melanin, possibly due to an autoimmune reaction. The epidermis is composed of keratinized, stratified squamous epithelium. The reticular layer appears reticulated (net-like) due to a tight meshwork of fibers. Give three main functions of each of the human body systems below:1. A perfect introduction to the Integumentary System, this worksheet carefully examines some of the main features of the human skin.
Receptor cell in the stratum basale of the epidermis that responds to the sense of touch. The second page is a worksheet where students are asked to describe each system in three works, explain why it is important, and hypothesize about what would happen to the human body if that body system did not work. I made several copies of the descriptions and images o. The first is a Merkel cell, which functions as a receptor and is responsible for stimulating sensory nerves that the brain perceives as touch. Layer of the epidermis between the stratum granulosum and stratum corneum, found only in thick skin covering the palms, soles of the feet, and digits. Systems covered include integumentary system, skeletal system, muscular system, nervous system, somatic and special senses, endocrine system, blood, cardiovascular sys. Layer of the epidermis superficial to the stratum spinosum. You may use both your notes and textbook to answer questions.
The cells in the stratum basale bond to the dermis via intertwining collagen fibers, referred to as the basement membrane. They also tend to be more sensitive to light and have vision problems due to the lack of pigmentation on the retinal wall. Describe the role of keratinocytes and their life cycle. The body mass index (BMI) is often used as a measure of fat, although this measure is, in fact, derived from a mathematical formula that compares body weight (mass) to height. 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. Muscular System Puzzle. Circulatory System7. It also has numerous sensory, and autonomic and sympathetic nerve fibers ensuring communication to and from the brain. The deeper layer of skin is well vascularized (has numerous blood vessels) and is superficial to the hypodermics. The video and worksheet cover the following system: The integumentary system specifically the topic of our skin. Cell found in the stratum basale of the epidermis that produces the pigment melanin. Intercellular vesicle that transfers melanin from melanocytes into keratinocytes of the epidermis. The hypodermis (also called the subcutaneous layer or superficial fascia) is a layer directly below the dermis and serves to connect the skin to the underlying fascia (fibrous tissue) surrounding the muscles.
McGraw-Hill Education. However, in these cases the effect on skin color has nothing do with the skin's pigmentation. Moles are larger masses of melanocytes, and although most are benign, they should be monitored for changes that might indicate the presence of cancer (Figure 5. Too much sun exposure can eventually lead to wrinkling due to the destruction of the cellular structure of the skin, and in severe cases, can cause sufficient DNA damage to result in skin cancer. This layer makes up around 80% of the dermis and is well vascularized and has a rich sensory and sympathetic nerve supply. Two other cell types are found dispersed among the basal cells in the stratum basale. Layer of the epidermis superficial to the stratum basale, characterized by the presence of desmosomes. Cells of the epidermis derive from stem cells of the stratum basale. Most superficial layer of the epidermis. The skin and its accessory structures make up the integumentary system, which provides the body with overall protection.
Cells in the stratum corneum are periodically shed. Coloring in the sketch notes reinforces the learned concepts by activating both sides of the brain. Recall that melanin helps protect the skin from the harmful effects of UV radiation. This worksheet includes 10 questions for students to follow along with the Operation Ouch Video on the integumentary system found on Youtube. The melanin is transferred into the keratinocytes via a cellular vesicle called a melanosome (Figure 5. View the University of Michigan WebScope at? This leads to a loss of color in patches (Figure 5. Describe how the cells change as they become integrated into the different layers of the epidermis. The stratum lucidum is a smooth, seemingly translucent layer of the epidermis located just above the stratum granulosum and below the stratum corneum. Students will learn about the parts and functions of the integumentary system. Everyday Connection – Lipid Storage.
Word Scramble covering the terminology that will be introduced when discussing The Integumentary System with Physiology students. This activity has both pr. There is a dynamic interplay between the amount of protection from UV radiation that melanin provides and the amount of vitamin D produced. Respiratory System8. This activity is perfect for review and can also be used as a study guide. The skin is made of multiple layers of cells and tissues, which are held to underlying structures by connective tissue (Figure 5. Answers for Critical Thinking Questions. With a prolonged reduction in oxygen levels, dark red deoxyhemoglobin becomes dominant in the blood, making the skin appear blue, a condition referred to as cyanosis (kyanos is the Greek word for "blue"). Cosmetic procedures, such as microdermabrasion, help remove some of the dry, upper layer and aim to keep the skin looking "fresh" and healthy.
A sudden drop in oxygenation can affect skin color, causing the skin to initially turn ashen (white). A great resource for students of both middle and high school science. The accumulation of melanin in keratinocytes results in the darkening of the skin, or a tan. Similarly, Addison's disease can stimulate the release of excess amounts of adrenocorticotropic hormone (ACTH), which can give the skin a deep bronze color. This superficial layer of the dermis projects into the stratum basale of the epidermis to form finger-like dermal papillae (see Figure 5. It contains blood and lymph vessels, nerves, and other structures, such as hair follicles and sweat glands. Learning Objectives.
These puzzles cover an entire year of a high school Anatomy class and can also be used in a Biology class. A couple of the more noticeable disorders, albinism and vitiligo, affect the appearance of the skin and its accessory organs. In addition, the papillary layer contains phagocytes, defensive cells that help fight bacteria or other infections that have breached the skin. What are the basic functions of each of these layers?
A word bank is included, which can be removed to make the worksheet more challenging. The stratum corneum is the most superficial layer of the epidermis and is the layer exposed to the outside environment (see Figure 5. The first thing a clinician sees is the skin, and so the examination of the skin should be part of any thorough physical examination. This product includes 10 different crossword puzzles and their answer keys. Eumelanin exists as black and brown, whereas pheomelanin provides a red color. The video is called Science for kids | Body Parts - SKIN | Experiments for kids | Operation Ouch it can be found on youtube.
The skin is composed of two major layers: a superficial epidermis and a deeper dermis. Individuals with albinism tend to appear white or very pale due to the lack of melanin in their skin and hair. This increased melanin accumulation protects the DNA of epidermal cells from UV ray damage and the breakdown of folic acid, a nutrient necessary for our health and well-being. In much of the developed world, insufficient exercise coupled with the ready availability and consumption of high-calorie foods have resulted in unwanted accumulations of adipose tissue in many people. Although you may not typically think of the skin as an organ, it is in fact made of tissues that work together as a single structure to perform unique and critical functions. Fat distribution changes as our bodies mature and age. Schaum's is the key to faster learning and higher grades in every subject. Describe the role of melanocytes in skin pigmentation. Outermost tissue layer of the skin. Skin condition in which melanocytes in certain areas lose the ability to produce melanin, possibly due an autoimmune reaction that leads to loss of color in patches. As new cells are formed, the existing cells are pushed superficially away from the stratum basale.
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