The integumentary system basic structure of
Light Micrograph of a Meissner Corpuscle.
The skin (integumentary system) exercise 6 answer key
It does not contain blood vessels. The sympathetic nervous system is continuously monitoring body temperature and initiating appropriate motor responses. Vitamin D is essential for normal absorption of calcium and phosphorous, which are required for healthy bones. The spines found here are cellular projections called desmosomes that form between keratinocytes to hold them together and resist friction. The nervous system depends on neurons embedded in your skin to sense the outside world. Generally, skin, especially on the face and hands, starts to display the first noticeable signs of aging, as it loses its elasticity over time. Even when the body does not appear to be noticeably sweating, approximately mL of sweat insensible perspiration are secreted a day. Elderly individuals who suffer from vitamin D deficiency can develop a condition called osteomalacia, a softening of the bones. The skin also is important in helping to regulate your body temperature. Hypodermis Deep to the dermis is a layer of loose connective tissues known as the hypodermis, subcutis, or subcutaneous tissue. Main article: Dermis The dermis is the middle layer of skin, composed of dense irregular connective tissue and areolar connective tissue such as a collagen with elastin arranged in a diffusely bundled and woven pattern. In addition to these specialized receptors, there are sensory nerves connected to each hair follicle, pain and temperature receptors scattered throughout the skin, and motor nerves innervate the arrector pili muscles and glands. The other is the reticular layer which is the deep layer of the dermis and consists of the dense irregular connective tissue. Alcohol causes vasodilation in the dermis, leading to increased perspiration as more blood reaches sweat glands.
When UV light present in sunlight or tanning bed lights strikes the skin, it penetrates through the outer layers of the epidermis and strikes some of the molecules of 7-dehydrocholesterol, converting it into vitamin D3.
Skin Color Human skin color is controlled by the interaction of 3 pigments: melanin, carotene, and hemoglobin. In the case of the body entering a state of hypothermia, the skin is able to raise body temperature through the contraction of arrector pili muscles and through vasoconstriction.
The skin integumentary system worksheet answers exercise 6
The ability to order a vitamin D home test and check our own levels thankfully makes it simpler to identify deficiency. According to the American Academy of Dermatology, 24 percent of people from ages 18 to 50 have a tattoo. One is the papillary layer which is the superficial layer and consists of the areolar connective tissue. It is essentially composed of a type of cell known as adipocytes specialized in accumulating and storing fats. Small-bodied invertebrates of aquatic or continually moist habitats respire using the outer layer integument. At this point the cells are so far removed from the nutrients that diffuse from the blood vessels in the dermis that the cells go through the process of apoptosis. Integumentary System Introduction The integumentary system consists of the skin, hair, nails, glands, and nerves. Sweat glands in the skin allow the skin surface to cool when the body gets overheated.
The keratinocytes of the cuticle are stacked on top of each other like shingles so that the outer tip of each cell points away from the body.
The epidermis rests upon and protects the deeper and thicker dermis layer of the skin.
It is composed mainly of fatty tissue. The skin is one of the first defense mechanisms in your immune system. Hemoglobin is the red pigment found in red blood cells, but can be seen through the layers of the skin as a light red or pink color.
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