HLTC22H3 Chapter 5: Chapter 5(1).docx

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26 Apr 2012

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Chapter 5 aging of the skin and musculoskeletal system. The skin is the front line of defence against harmful environmental influences and is an important part of our immunologic and endocrine systems. Critical in temp maintenance and aids in homeostasis. Sensory nerves in the skin allow us to monitor the environment but also warn us of danger through pain. The integumentary system has important symbolic functions in that it is a key component of our appearance and is a critical source of cues that affect social interaction. The skin is that largest and most visible organ of the body. Outermost layer of the skin is called the epidermis , and the second layer is the dermis. Beneath the epidermis and dermis is a layer of subcutaneous fat; hair follicles, nail beds and nails, and sweat and sebaceous glands are embedded in the various layers.

Related Questions

1-What type of tissue(s) is the hypodermis? Is the hypodermis a layer of skin?

2-What are the important functions of subcutaneous fat? Is liposuction a means of permanent fat loss? Why is the hypodermis the desirable site for subcutaneous injections, such as insulin shots?

3-How do partial-thickness burns differ from full-thickness burns? Is there typically scarring following first degree burns? Why so/why not? Why do severe second degree burns and third degree burns often require skin grafting?

4-Skin is referred to as soft keratin, but hair and nails are referred to as hard keratin. Why? What are the functions of a hair follicle? The arrector-pili reflex is considered to be a vestigial reflex. That is, it once had a physiological purpose, but that purpose does not exist anymore, but the reflex still does. What was the function of this reflex in distant humans? What are goosebumps? How do they relate to this reflex?

The maintenance of homeostasis is of major importance to all organ systems in the body and the overall survival of the individual. Explain how homeostasis is the maintenance of a dynamic range of environmental qualities rather than holding the internal environment at a set point. What would be wrong with a set point (say for body temperature) rather than a working range of temperatures?

The endocrine system is closely tied to homeostasis functioning. Give two examples of hormones (including their glands of origin and action) that play major roles in homeostatic processes in the body. What happens if these hormones are disrupted in their actions?

Also, look at how we adapt to survival in the outside world. Discuss how maintaining homeostasis gives us greater freedom of activity from dependence upon changes in the external environment. What happens during extremes that force our bodies out of homeostatic bounds? Give specific examples.

Why is the maintenance of homeostasis especially important during development of new humans within the bodies of their mothers? What can go wrong if specific homeostatic functions are disrupted?

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2. The outermost layer of the human skin is called the __________. Dermis Fatty connective tissue Epidermis Ceruminous layer

3. The skin helps to protect the body from ultraviolet rays by ________________. A. Sweating B. Being flexible C. Using pigment - producing cells D. Being waterproof

4. Which of the following is NOT a protective function of the human skin? Protecting the body from chemicals Helping to regulate body temperature Protecting internal organs from abrasion Digesting external contaminants Creating a barrier between the body and ultraviolet rays from the sun

5. Which of the following is NOT an organ associated with the lymphatic system? Tonsils Spleen Pancreas Vermiform appendix Peyerâs patches

6. Tonsils ____________________. (Select all that apply) Are accessories of the integumentary system Are masses of lymphatic tissue embedded in mucous membranes Are regulated by the respiratory system Are frequently removed in a tonsillectomy Decrease in size as the body ages

7. During which stage of life are the lymphatic organs the most likely to be less functional and reduced in size? Infancy and Childhood Puberty Adulthood The size and function of the organs is not related to life stage

8. The two major groups of lymphocytes found in the body are the ___________. A lymphocytes and B lymphocytes Minor lymphocytes and Major lymphocytes B lymphocytes and C lymphocytes B lymphocytes and T lymphocytes

9. The organs associated with the Alimentary Canal share which similarity/similarities? They all belong to the lymphatic system They all belong to the gastrointestinal system Food does not pass directly through them during the process of digestion Food does pass directly through them during the process of digestion Both B and D

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HLTC22H3 Chapter 5: Chapter 5(1).docx

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