"Comet" word firstly from Greece. Aster star with long hair. Comet is a Small Solar System Body that orbits the Sun. There are 2 kinds of comet's tail, as a gas (straight) and as dust (curve). When the comet is near sun, comet is bigger and can reach Jupiter's size, the length is 150 million km. Tail's direction always get far from the sun. Before sun rise, comet's tail direction is to the west and after sun set, comet's tail direction is to the east. This caused because there's solar wind, composed from:proton, electron, soft molecules, and solar radiation. Comet has 3 kinds, oval, hyper ball, para ball.
Hair is a protein filament that grows through the epidermis from follicles deep within the dermis. The fine, soft hair found on many nonhuman mammals is typically called fur; wool is the characteristically curly hair found on sheep and goats. Found exclusively in mammals, hair is one of the defining characteristics of the mammalian class. Although other non-mammals, especially insects, show filamentous outgrowths, these are not considered "hair" in the scientific sense. So-called "hairs" are also found on plants. The projections on arthropods such as insects and spiders are actually insect bristles, composed of a polysaccharide called chitin. There are varieties of cats, dogs, and mice bred to have little or no visible fur. In some species, hair is absent at certain stages of life. The main component of hair fiber is keratin. Cross section of hair follicle
The hair can be divided into three parts length-wise, the bulb, a swelling at the base which originates from the dermis, the root, which is the hair lying beneath the skin surface, and the shaft, which is the hair above the skin surface. In cross-section, there are also three parts, the medulla, an area in the core which contains loose cells and airspaces the cortex, which contains densely packed keratin and the cuticle, which is a single layer of cells arranged like roof shingles.
The Human Skeletal System constructed by 206 pieces of bones and few cartilages. When human was born there are more than 300 pieces of bones. Many of them join when the human grow. The function of skeletal system are: 1. Support It holds us upright and provides a frame work for tissues and organs. 2. Protection It protects important and soft organs. Heart and lungs are protected by the rib- cage. The brain is protected by the skull. 3. Movement Takes place when muscles move bone at joints. 4. Making blood cells Red and white blood cells are made inside the bone marrow. 5. Reservoir Store calcium and phosphorus.
Human skeletal system consist of axial and appendicular skeleton.
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Thursday, August 13, 2009
Comet @ 6:59 AM 
