![]() This new form of parental care provides a plausible intermediate stage in the evolution of viviparity in caecilians. Young animals are equipped with a specialized dentition, which they use to peel and eat the outer layer of their mother's modified skin. Boulengerula taitanus is a direct-developing, oviparous caecilian 3, the skin of which is transformed in brooding females to provide a rich supply of nutrients for the developing offspring. Here we report a remarkable form of parental care and mechanism of parent–offspring nutrient transfer in a caecilian amphibian. Alternative forms of nutrition may allow parents to delay and potentially redirect their investment. Providing offspring with additional nutrition should be favoured by natural selection when the consequent increased fitness of the young offsets any corresponding reduction in fecundity 2. It also contains 1,000 nerve endings and 20 blood vessels.Although the initial growth and development of most multicellular animals depends on the provision of yolk, there are many varied contrivances by which animals provide additional or alternative investment in their offspring 1. One inch of your skin has approximately 19 million skin cells and 60,000 melanocytes (cells that make melanin or skin pigment). Regulates body temperature: Fat in the hypodermis keeps you from getting too cold or hot.These nerves and blood vessels branch out to connect the hypodermis to the rest of the body. Helps the nerves and blood vessels: Nerves and blood vessels in the dermis (middle layer) get larger in the hypodermis.Has connective tissue: This tissue connects layers of skin to muscles and bones.Cushions muscles and bones: Fat in the hypodermis protects muscles and bones from injuries when you fall or are in an accident.The bottom layer of skin, or hypodermis, is the fatty layer. What does the hypodermis (bottom layer of skin) do? Supplies blood: Blood vessels in the dermis provide nutrients to the epidermis, keeping the skin layers healthy.Sweat helps regulate your body temperature. Produces sweat: Sweat glands in the dermis release sweat through skin pores.Oil also prevents your skin from absorbing too much water when you swim or get caught in a rainstorm. Makes oil: Oil glands in the dermis help keep the skin soft and smooth. ![]() These nerve receptors also help you feel pain. Keeps you in touch: Nerves in the dermis tell you when something is too hot to touch, itchy or super soft.Grows hair: The roots of hair follicles attach to the dermis.It also helps stretched skin regain its shape. Another protein found in the dermis, elastin, keeps skin flexible. Has collagen and elastin: Collagen is a protein that makes skin cells strong and resilient.The dermis makes up 90% of skin’s thickness. What does the dermis (middle layer of skin) do? People who make more melanin have darker skin and may tan more quickly. The amount of melanin you have determines the color of your skin, hair and eyes. Provides skin color: The epidermis contains melanin, the pigment that gives skin its color.They help fight off germs and infections. Protects your body: Langerhans cells in the epidermis are part of the body’s immune system.These new cells replace the approximately 40,000 old skin cells that your body sheds every day. Makes new skin: The epidermis continually makes new skin cells.It also protects against rain, sun and other elements. Acts as a protective barrier: The epidermis keeps bacteria and germs from entering your body and bloodstream and causing infections.Keratin, a protein inside skin cells, makes up the skin cells and, along with other proteins, sticks together to form this layer. Your epidermis is the top layer of the skin that you can see and touch. What does the epidermis (top layer of skin) do?
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |