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The stratum germinativum is an excellent barrier to pathogens.B. FalseA. TrueLangerhans cells phagocytize pathogens and produce antibodies to them.B. FalseA. TrueMelanocytes produce melanin when stimulated by flourescent light.Vitamin D is produced here, and then is part of the process of blood clotting.Question 16 4 out of 6 points
Which of the following statements regarding the dermis are true and which are false?QuestionCorrect MatchSelected MatchThe arterioles constrict in cold weather in order to keep heat close to the body surface.The protein collagen provides strengthA. TrueA. TrueThe papillary layer has capillaries to nourish the stratum corneum.Within a hair follicle, mitosis at the hair root produces the hair shaf.With aging, both collagen and elastin fibers break down and are not replaced.Many cutaneous receptors are located in the dermis.A. TrueA. TrueQuestion 17 4 out of 6 pointsWhich of the following statements regarding subcutaneous tissue are true and which are false?The layer is made of adipose tissue and fibrous connective tissueB. FalseA. TrueThis layer is between the dermis and visceral muscles.B. A.
TrueTriglycerides are the energy storage form in adipocytes.White blood cells are present to intercept pathogens that enter breaks in the skin.A. TrueA. TrueInflammation in this layer is a response to damage.This layer can vary considerably in thickness.Question 18 4 out of 6 pointsWhich of the following statements regarding the accessory structures of the skin are true and which are false?Drying and cracking of the skin are prevented by sebum.A. TrueA. TrueThe eardrum is kept pliable by cerumen.The sensory receptors for pain and pressure are free nerve endings.Fingernails are useful for scratching and for picking up A. A.
Both scalp and body hair provide thermal insulation.B. FalseA. TrueQuestion 19 15 out of 15 pointsGoing out in the sun stimulates quite a bit of activity in the skin, especially on a hot summer day. Describe what is happening in the skin in response to sunlight. Note: this question is worth 15 points. Be sure you include at least five activities.