SPIDERS Essays - Venomous Spiders, Spider, Arachnid, Spinneret

SPIDERS Michelle Reynolds Pope Science January 06, 1999 Outline Title Introduction: I.The first sub-topic A. Distinctive Characteristics 1.Detail of the external anatomy 2.Detail of the sensory organs B.Circulation and locomotion 1.Detail of the circulitary system 2.Detail of the respiratory system II.The second sub-topic A.Digestion, Venom, and Spider Silk 1.Detail of the digestive system 2.Details of venom and spider silk Conclusion: Spiders are a very special unique and complexed Arachnids Michelle Reynolds Ms. Pope Science January 06, 1999 SPIDERS The word spider came from an Old English verb spinnan. Spinnan means ?to spin.? People in Eroupe see spiders with distaste, in African and in American cultures spiders are respected. Spiders are the most abundant and distinctive of all earthly predators. Most of the time they are not dangerous to us, spiders eat almost always insects and are found in places from the Tundras all the way to the low forrests They play abig job in taking care of the insect population, even the ones that can give us diseases. Distinctive Characteristics Even though insects and spiders belong to the group called, Arthopoda, they look so different from each other so they are put into different classes. The Insects and the Arachnids. Scientists think that these two classes split up thousands of years ago. External Anatomy Spiders come in different sizes, some of them are only 0.1 centimeter long,and some of the are more than 4 inches long. They have two body parts and eight legs. The spiders head and thorax are one body part. The thorax is the chest area of a spider. The abdomen or the stomache is the second body part Each leg has seven sections, and on the tips of many spiders legs are two tiny claws. Spiders that make a web use these claws and their notched hairs, to walk on their webs without sticking to them. Like insects, spiders have a body shell called an exoskeleton. This shell covers the body and the legs and keeps the spider from drying out. Much like our skin is to us. And to support the spider like our bones support us. Spiders even have a skelton inside called the internal skeleton. This is where the muscles attach. Unlike insects, spiders don't have antennaes. They do have two things near their mouths these are called pedipalps. They are used by spiders to handle their food. The palps of a baby male spider look like boxing gloves. When they grow up the palps are used for breeding. Sensory Organs Spiders have eight eyes in two groups and some spiders can see images. Others can't and they have to rely on feel like those on webs. Web weaving spiders eat, breed, and lay their eggs from silk threads. The main part of a spiders senses are two types of hair. The tiny ones have nerves. When these hairs are bent they send information to the brain and may cause it to run away or get ready to attack. They also sense touch, vibration and air flow. The second type of hair are the even tinier one these keep an eye out for pressure changes in the air. Curculation and Locomotion Spiders have an open circulatory system this means that they have no blood vessels or arteries. Instead, the blood oozes between the spiders flesh, and collects in little pockets on the underside of the body. A good circulation is very important to the spiders legs. When spiders don't get enough water, their legs fold up and they can't move them. Respiration Spiders have different kind of respitory systems. Some have a tubular tracheae, some have book lungs, and others have both. They first spiders to live had one or two pairpairs of book lungs. The spiders now days have one pair of book lungs and a pair of tubular tracheae. Digestion Spiders are th only animal to digest their food on the out side of their bodies. The gut of the spider is behind its stomach, and part of it goes into the front legs. This lets the spiders to live for days without eating. Venom Almost all spiders have venom glands. Most spider venoms are not harmful to us, but the black black widow and the brown recluse spiders will poisen us. Spider Silk What makes a spider a spider? They can spin a web. All spiders, even baby ones, have silk glands and spinning organs called spinnerets. The silk glands push the web out and the spinnerets weave the web. Works Cited First reference. The Comptons Interactive Enclopedia CD ROM. Additional reference. The Discovery Channel On-Line on the

Trombone Ensemble essays

Trombone Ensemble essays SWT Trombone Ensemble On the evening of November 11,1999, the Southwest Texas Trombone Ensemble provided an apprehensive crowd with a truly wonderful performance. Starting with Sonata No.1 for Trombone Choir by Evan Copley, the ensemble exhibited fabulous variety in both the note and the speed in which they were playing. This skill mindfully produced a range of emotions, including anxiety and uneasiness. Charles R. Hurt, the conductor of the ensemble, skillfully piloted the ensemble in formulating an eerie feeling. I envisioned a cemetery scene with the light fog, worn tombstones, and mourners draped in black. The mood changed for the better with the arrival of the allegro, bringing with it a sound of a climax which flutters ones emotions. Sonata No.1 concludes climaxing one final time with a abrupt, powerful end. A highly emotional piece by Kazimierz Serocki titled Suita na 4 Puzony flowed placidly interrupted every so often by sounds of concern, as if someone were about to be attac ked by suprise. All the feelings produced in the intrada are subdued by the depressing, dark, cold canone. Its a slow melody of sadness but a sadness of extreme measure. A low pitch adds to the aura of mortality. These two particular feelings, anxiety and gloom, are toyed with throughout. During the arietta, a splendid job was done in building up the final Toccatina. There seemed to be a competition of sorts between the ensemble with sounds coming from each horn individually and sporadically. This effect created quite a frantic and raving atmosphere. To conclude the piece, the ensemble triumphantly came into unison, exploding with sounds of victory for the audience to discuss with one another during intermission. Following the intermission, the terrific trio of Joel Davidson, Joe Kramer, and Mike Lawson performed David Potters Aria ...

Economics Essay Example | Topics and Well Written Essays - 1500 words - 8

Economics - Essay Example As a way of influencing the demand and supply of money in the economy, the Federal Reserve use either contractionary or expansionary money policy. Because, the interest rates are low there is a high availability of money supply in the economy as a result, there is moderate inflation occurrence that is currently at two percent. As the Fed chairperson, the use of restrictive monetary policy measures ensure s there is a steady flow of money in the economy during the period (Bartolotti, 2006). This is because restrictive monetary policy ensures that there is a higher level of depository interest rate for commercial banksas it borrows money from the Federal Reserve banks as they keep their reserves at the authorized level. In addition, it is critical to increase the open market operations by ensuring the citizens with extra money to save can invest in it because of the highly expected returns leading to money being drained out of the economy. As a result, the banking institutions will cha nge a higher rate as it lends less money with increased reserve requirement thus, individuals will seek alternatives for seeking funds rather than borrowing money. In addition, the government can make investments with the funds collected from open market operations leading to increased gross domestic product (GDP) growth. With an unemployment rate that is quite high, there is a need to carry out measures that will influence the growth of employment levels in the economy. Concerning, the new classical economists notion on unemployment and inflation, they highly advocate for a stable inflation-unemployment trade-off that is achievable through the Phillips curve. Based on the Philips curve the trade off is achievable on the assumption of changes in the price level in the private sector freely. This is because the Philips curve enhances the relationship between inflation and unemployment because of fiscal and monetary policy changes (Knoop, 2004). Nonetheless, the classical economics ar gue based on the conceptualization that the expectations-augmented in the Phillips curve emphasizes that the unemployment rate should not extend further than the natural level as it could lead to increased inflation rates. More significantly, it is critical to implement fiscal and monetary policies to influence employment levels (Knoop, 2004). This is because the economy is recovering from a recession period and the economy tends to grow with the aggregate demand (AD) increasing therefore, the levels of employment will increase. Even though, there is an increased pressure for a raise in wages after rescission, the rate at which the economy grows is faster, and the wages begin to rises slowly. Based on the Philips curve an outward shift of the aggregate demand AD curve because of increased consumer spending causes the equilibrium level of national output to shift to the point Y2 beyond potential gross domestic product (GDP). As a result, this creates a positive output gap, and it is more preferably attributed to cause a rise in inflationary pressure