Anatomy and Physiology Answer Key

The integumentary system page 43 1 a and b any of in

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Unformatted text preview: nses to pain, pressure, heat etc. – Skin secretes sebum nd antimicrobial substances to protect against microbial invasion. – Skin contains melanocytes which provide protection against excessive UV light. – Skin absorbs UV light and produces a vitamin D precursor (needed for calcium absorption). Note missing word: In opening graphic, the label skeletal system should read: " Skin absorbs sunlight ad produces a vitamin D precursor. " 2. A tattoo inserts ink into the upper layer of the dermis where it becomes trapped within fibroblasts (as part of the body sealing off the foreign material). While it is trapped here, it remains a relatively inert and (a) Stratum basale: Epidermis (innermost). The regenerative layer of cells, which produces new cells and also contains the mealnocytes, which give skin its protective dark pigment. (b) Stratum corneum: Epidermis (outermost). Provides protection against wear and therefore protects the deeper layers of cells. (c) Sweat glands: Dermis (reticular layer): Produce sweat, which cools by evaporation (thermoregulation). (d) Collagen fibers: Lower dermis. Provide strength to the dermis, making it resilient. Bone (page 50) 1. Bones grow in length by continuous growth of new cartilage in the epiphyseal plate, which is then covered in a bone matrix and calcified to form new bone. Appositional growth, in contrast, involves addition of new bone to the outside of the diaphysis and resorption of bone from the inner diaphysis surface. 2. (a) Support: Provides a frame to keep the body supported. (b) Protection: Bones can serve to protect internal organs, such as the skull protecting the brain or the ribs protecting the heart and lungs. (c) Movement: Bones, skeletal muscles, tendons, ligaments, and joints function together to generate and transfer forces so that body parts or the whole body can be moved. (d) Blood cell production: The marrow, located within the medullary cavity of long bones and interstices of cancellous bone, produces blood cells in a process called haematopoiesis. (e) Mineral storage: Bones act as reserves of minerals important for...
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This document was uploaded on 01/28/2014.

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