lambdoid suture The dermis contains blood vessels and nerve fibers while the epi
ID: 167287 • Letter: L
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lambdoid suture The dermis contains blood vessels and nerve fibers while the epidermis does not For a doctor, simply looking at a patient's skin can help in making a diagnosis. When an individuals is exposed to extremely cold air the dermal blood vessels will dilated that more blood will be brought closer to the outside surface of the skin. Regardless of race, all human beings have about the same number of melanocytes. The pinkish hue of individuals with fair skin is the result of the crimson color of oxygen hemoglobin (contained in red cells) circulating in the dermal capillaries and reflection through the epidermis. Multiple Choice Questions 61) The major regions of a hair shaft include all ofExplanation / Answer
53) Answer: True - Epidermis is the outermost layer of skin and generally made up of layers of epithelial cells and acts as primary defense barrier against environmental pathogens and also helps to regulate transepidermal water loss. The dermis is the second layer of skin after epidermis and comprises of blood vessels and nerve endings and mostly comprised of elastin, collagen, and fibrillin.
54) Answer: False - The nature of the illness/problem cannot be confirmed just by looking at the skin (for example skin rash is a general immune response of the body towards the pathogen) hence additional checkups are required to confirm a diagnosis.
55) Answer: False - when an individual is exposed to extremely cold air the dermal vessels will undergo vasocontraction to prevent heat loss.
56) Answer: True - Regardless of the race all human beings have the same number of melanocytes. the skin color variation is due to amount and type of melanin produced by melanocytes.
57) Answer: True - People with fair skin has less melanin content and the crimson color generated due to binding of oxygen to hemoglobin is reflected through the light skin giving a pinkish hue.
59) Answer: False - Thick skin has lesser dermal layer but has high epidermal layers and found in places that undergo abrasion.
60) Answer: True - Arrector pili muscles are composed of smooth muscle fibres and are attached to hair follicles. The beneficial function can vary from humans to mammals (example: In some mammals, these muscles are used for insulation and in porcupine, they are contracted to erect the hair for defence)
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