Eccrine sweat glands Are the much more numerous type and occur almost

Eccrine sweat glands are the much more numerous type

This preview shows page 21 - 23 out of 26 pages.

Eccrine sweat glands: Are the much more numerous type and occur almost everywhere, being especially abundant on the palms & soles. They secrete the predominant type of sweat, which is about 99% water, with traces of salt & metabolic wastes. (2) Apocrine sweat glands: Are mostly confined to the axillary, anal, and genital regions. Apocrine glands start to function during puberty under the influence of androgen (s). The sweat secreted by apocrine glands contains some fats & proteins, in addition to the usual predominant components of sweat. Apocrine gland sweat is odorless when first secreted, but as bacteria on the skin degrade its organic (fat & protein) constituents, it acquires the smell we call body odor . 3. Ceruminous glands a. Located only in the skin that lines the external auditory canal (external ear canal). b. Produce earwax. J. Nails 1. Consist of hard keratin . 2. An ingrown toenail occurs when the edge of a nail digs into the skin around it. 3. Changes in the shape, structure, or appearance of nails may indicate the existence of a disease that affects metabolism throughout the body. The state of one’s fingernails & toenails can be indicative of one’s overall health. K. Burns >> Two life-threatening problems associated with severe burns of the skin: 1. The immediate threat to life is a catastrophic loss of body fluids (and thus loss of water & important electrolytes) from the body. This leads to potentially fatal circulatory shock, characterized by inadequate blood circulation & blood pressure caused by low blood volume. 2. If a burn victim survives the initial crisis stated above, severe infection becomes the main threat. >> Burns may be classified in terms of “ degrees ” and “ thickness ”. 1. First-degree burns …………. Only the epidermis is damaged. 21
2. Second-degree burns ……… Involve injury to the epidermis and the upper portion of the dermis. Symptoms include blisters. ** First- and Second-degree burns are types of “ partial - thickness ” burns. 3. Third-degree burns …………. Involve destruction of the entire thickness of the skin, so are also called “ full - thickness ” burns. Skin grafting is commonly performed to cover areas of third-degree burns. Scarring is very likely to occur at sites of such burns. L. Skin Tumors 1. Most are benign. For example, warts are benign tumors caused by viruses. 2. Skin cancer a. Most significant risk factor for it: Overexposure to UV ( ultraviolet ) rays in sunlight. b. Most common type of cancer. c. Types of skin cancer: (1) Basal cell carcinoma (a) Least malignant & most common type of skin cancer. (b) Involves cancerous cells of the stratum basale/germinativum. (c) Nearly always completely curable. (2) Squamous cell carcinoma (a) Arises from cancerous epithelial cells of the stratum spinosum. (b) If treated early, nearly always cured. (3) Malignant melanoma (a) Is a very serous cancer involving melanocytes. (b) Accounts for only a small percentage of the incidences of skin cancers, but its frequency is increasing in the United States. (c) Often arises from existing moles, usually appearing as a growing dark patch. (d)

  • Left Quote Icon

    Student Picture

  • Left Quote Icon

    Student Picture

  • Left Quote Icon

    Student Picture