Module 2 Learning Assignment 2B.docx - QUESTION 1 Match each major part of the integumentary system with its proper structure and\/or function Made of

Module 2 Learning Assignment 2B.docx - QUESTION 1 Match...

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QUESTION 1 Match each major part of the integumentary system with its proper structure and/or function. Made of areolar connective and adipose tissue Contains the accessory structures of the skin, such as receptors and sweat glands The outer layer of the skin, made of stratified squamous epithelium Connects the dermis to the muscles and stores fat Mitosis constantly renews this layer, which forms a barrier between the body and the external environment The inner layer of the skin, made of fibrous connective tissue A . Epidermis B . Dermis C . Subcutaneous Tissue QUESTION 2 Match the following parts of the dermis with their proper descriptions. Contains capillaries to nourish the stratum germinativum of the epidermis Provide information about changes in the external environment The protein that gives the dermis its strength Produce a lipid substance called sebum The cells that produce collagen and elastin Mitosis at the root produces the hair shaft Produce their secretion in times of stress or strong emotions Produce their secretion during exercise or in a warm environment A . Fibroblasts B . Collagen fibers C . Elastin fibers D . Papillary layer E . Hair follicles F. Nail follicles G . Sebaceous glands H . Eccrine sweat glands I. Apocrine sweat glands J. Receptors C. B. A. C. A. B. D. J . B. G. A. E. I. H.
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Mitosis at the root produces the nail The protein that gives the dermis elasticity QUESTION 3 The dermis is made of irregular fibrous connective tissue. What is the structure and makeup of the matrix of this tissue that contributes to the SPECIFIC functioning of the dermis? The fibers of the dermis are criss-cross and run in all directions. The dermis is made up of collagen (strong) and elastin (elastic- stretchy) fibers. The strength and elasticity allow the skin to provide a barrier to the outside environment and for the skin to recoil after being stretched. QUESTION 4 Reference Figure 5-2 - Which type of cell is capable of self-locomotion? Where does this type of cell originate? What does it carry and to where? What purpose does this serve? The Langerhans cell is capable of self-locomotion. This cell originates in the red bone marrow. The Langerhans picks up (phagocytize) and carries foreign materials, such as bacterium, and transport it to a lymph node. The purpose of this is to trigger an immune response such as the production of antibodies as a response to pathogens. In the epidermis: 1) Where does mitosis take place? 2) What protein do the new cells produce? 3) What purpose does this protein serve and where? 4) What happens to these cells as they move toward the surface? 5) What are Merkel cells? Mitosis takes place in the epidermis in stratum germinativum (stratum basale). The new cells produce the protein keratin. In the Stratum germinativum living keratinocytes are able to synthesize antimicrobial peptides called defensins and as they get farther away from the capillaries of the dermis they die. In the stratum corneum keratin prevents loss and entry of water and can also resist the entry of chemicals and pathogens. Merkel cells are receptors for the sense of
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