PAPER Topics

... heat needed in the body. Skeletal muscle tissue is made up of smaller fibers called myofibrils. These myofibrils are composed of even smaller protein filaments. These filaments can be either thick or thin. The thick filaments are made of the protein myosin, and the thin filaments are made of the protein actin. The arrangement of the myosin and actin gives skeletal muscle its striated (or striped) appearance. Each section of a myofibril is called a sarcomere, and is the functional unit of muscle. How muscles contract is directly related to their structure. The sliding filament theory is an explanation of how muscle contractions occur. This theory states that the actin filaments within ...

... Scientist barely ever count the amount of individuals in a certain area because it would take too much time. Instead of actually counting the number of individuals in an area they would compare it with other areas where they know the population of individuals. In this way they can roughly estimate the number of individuals in a certain area. 4. What might happen to a rabbit population in an area where there are no predators? If there were a few rabbits in an area with no predators they would over-populate and cause serious damage to the ground. Since they are fast at reproducing there is nothing to control the population level as the predators do so they damage the eco-system and t ...

... blood temperature, or a change outside of your body such as a touch on the arm. Your body then goes through a process know as its integrative function. This is when your nervous system processes information sent via your sensory neurons and in a way “makes decisions” regarding appropriate responses. When all is said and done during this process a decision is made and sent through interneurons that act as a postman and deliver the decision to the motor function part of your nervous system. The motor function involves responding to the decision delivered by the interneurons by using efferent neurons that obtain the decision and send it to the effector to finally carry out the response. ...

... From one of these single strands of a DNA molecule, a mRNA molecule is built. This is accomplished by an enzyme which travels along a portion of DNA between two exons and attaches the opposing base pairs to the backbone of the mRNA (a structure composed of phosphates and ribose). The nitrogen bases of this new molecule are identical to that of the opposite side of the original DNA molecule except that the thymine has been replaced with uracil. The formation of this molecule allows for the construction of proteins in the ribosome without risking the DNA in the cytoplasm. The mRNA travels through the cell to a ribosome. Here tRNA which contain the appropriate anti-codon col ...

... would help to know how they work and what responsibilities are needed when choosing to take them. are a synthetic for of the naturally occurring hormone, testosterone. are used to promote accelerated muscle hypertrophy in both males and females. Hypertrophy describes the increase in size of muscle as the result of stress put upon the muscle. Muscles go through hypertrophy in order to adapt to the increased demands placed upon them to perform. This is the primary goal of weight training. Once steroids are introduced into the bloodstream, they circulate throughout the body and are gradually collected at the receptor sites in the body designed to recognize and absorb them. These sit ...

... and pay to have them properly disposed of or stored ( 1). There are many things deposited in . Garbage, rubbish, ashes, large wastes, dead animals, sewage-treatment solids, industrial wastes, mining wastes and agricultural wastes are all materials deposited in (SWD 1). Many of these materials, about 50%, could be recycled, like glass, plastic, paper, etc., instead of being put in . Some trash put in is biodegradable, and some will never decompose. Food, yard wastes and paper were found in from around 50 years ago, and they never did decompose. A newspaper was found dating back to earlier than 1960 that was supposed to decompose in five weeks, but is still visible in the landfill af ...

... Thomson, another important person in the development of the atomic theory, was born in 1906. Thomson won the Nobel Prize in physics (1906) for his work in the conduction of electricty through gases. He discovered the electron by using cathode rays. An electron is the smallest particle of an atom, the charge on an electron is negative. Ernest Rutherford, who was born in 1871 identified the three main components of radioactivity: alpha, beta, and gamma particles. Radioactivity was discovered by a French scientist named Becquerel. Rutherford was also the first one to disdcover the true structure of an atom. An atom has a central heavy nucleus with an electron cloud surroundi ...

... risk for attention deficit disorders with hyperactivity, fine-motor impairment, and clumsiness as well as more subtle delays in motor performance and speech disorders. [4] These findings have been referred to as fetal alcohol effects (FAE). As recently described, FAS and FAE produce profound cognitive, behavioral, and psychosocial problems that persist to date of follow-up of those affected. In the most comprehensive and far-reaching study to date, Streissguth et al [5] traced the natural history into adulthood and demonstrated the profound, pervasive, and persistent nature of the biopsychosocial manifestations of these disorders. Cognitively those affected maintained subnormal int ...

... Pacific water is pushed westward by the trade winds, that water flows toward Asia and makes room for the colder, deep sea water, to rise and flow to the Americas. Because cold water doesn't evaporate, there is a large reduction in the formation of storm clouds. The weather patterns of La Nina are basically an exact opposite of El Nino. Strong high pressure systems form over the Pacific and low pressure systems are discovered over Australia. Westerly trade winds push the warm waters west. The once thick cloud cover over the equator is split. Because of the opposite pressure systems, the Jet Stream is severely distorted and Atlantic storms gain strength, and numbers. Also, the hurricane ...

... storage, and disposal of the depleted uranium. When nuclear fuel is first loaded into a reactor, 238U and 235U are present. When in the reactor, the 235U is gradually depleted and gives rise to fission products, generally, cesium (137Cs) and strontium (90Sr). These waste materials are very unstable and have to undergo radioactive disintegration before they can be transformed into stable isotopes. Each radioactive isotope in this waste material decays at its characteristic rate. A half-life can be less than a second or can be thousands of years long. The isotopes also emit characteristic radiation: it can be electromagnetic (X- ray or gamma radiation) or it can consist of particle ...