Keratinocytes develop from stem cells at the base of the epidermis and begin to produce and store the protein keratin. The epidermis is the outermost layer, providing the initial barrier to the external environment. Hemoglobin is another pigment most noticeable in people with little melanin.
By helping to synthesize and absorb vitamin D, the integumentary system works with the digestive system to encourage the uptake of calcium from our diet.
Protection The skin provides protection to its underlying tissues from pathogens, mechanical damage, and UV light. Vasodilation is the process through which smooth muscle lining the blood vessels in the dermis relax and allow more blood to enter the skin.
Stem cells in the follicle reproduce to form the keratinocytes that eventually form the hair while melanocytes produce pigment that gives the hair its color. Skin Color Human skin color is controlled by the interaction of 3 pigments: Young keratinocytes have a cuboidal shape and contain almost no keratin protein at all.
Its main function is to act as a barrier to protect the body from the outside world. Vasoconstriction is the process of smooth muscles in the walls of blood vessels in the dermis contracting to reduce the flood of blood to the skin. The fats contained in the adipocytes can be put back into circulation, via the venous route, during intense effort or when there is a lack of energy providing substances, and are then transformed into energy.
Within the dermis there are two distinct regions: The nail root is the portion of the nail found under the surface of the skin. Also, the stratum corneum is the top part of the epidermis. Just superficial to the stratum spinosum is the stratum granulosum, where keratinocytes begin to produce waxy lamellar granules to waterproof the skin.
Hair Hair is an accessory organ of the skin made of columns of tightly packed dead keratinocytes found in most regions of the body. 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.
The skin also is important in helping to regulate your body temperature. Sebaceous glands are found in every part of the skin except for the thick skin of the palms of the hands and soles of the feet.
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. This substance enters the bloodstream though the capillary networks in the skin. The density of these sensory receptors in the skin varies throughout the body, resulting in some regions of the body being more sensitive to touch, temperature, or pain than other regions.
The skin is one of the first defense mechanisms in your immune system.Integumentary System Learn with flashcards, games, and more — for free.
The integumentary system consists of the largest organ in the body, which is the skin. This extraordinary organ system protects the internal structures of the body from damage, prevents dehydration, stores fat, and produces vitamins and hormones.
The integumentary system consists of the skin, hair, nails, glands, and nerves. Its main function is to act as a barrier to protect the body from the outside world.
It also functions to retain body fluids, protect against disease, eliminate. The integumentary system includes hair, scales, feathers, hooves, and nails. It has a variety of additional functions; it may serve to waterproof, cushion, and protect the deeper tissues, excrete wastes, and regulate temperature, and is the attachment site for sensory receptors to detect pain, sensation, pressure, and temperature.
Integumentary System The integumentary system is an organ system consisting of the skin, hair, nails, and exocrine glands. The skin is only a few millimeters thick yet is by far the largest organ in the body.Download