Friday, January 31, 2020
Endocrine System Essay Example | Topics and Well Written Essays - 2000 words
Endocrine System - Essay Example The control and coordination of all bodily processes is done by the nervous system in tandem with the endocrine system. The two systems are so closely associated that they are collectively called the neuroendocrine system. Neural control centers in the hypothalamus of the brain control the endocrine system. The nervous system uses electrical impulses to exercise control over the body, while the endocrine system uses chemical messengers called hormones to communicate and link between the nervous system and bodily functions. The major functions of the endocrine system are response to stress and injury, energy metabolism, water and electrolyte balance, reproduction, birth and lactation. The endocrine system is concerned with continuous, long-term effects, which are slow and widespread. The three major components of the endocrine system are the endocrine glands, the hormones and the receptors in the target cells. (Adam 2001). Glands are aggregations of epithelial cells embedded within connective tissue and surrounded by rich vascular networks. The two major categories of glands are exocrine and endocrine. Those glands which excrete substances for elimination are called exocrine glands (derived from the Greek ‘exo’ for outside and ‘krine’ for secrete). These glands have ducts or tubes which carry their secretions to the surface of the skin or into body cavities. Other glands which secrete substances for further use by the body are called endocrine glands (‘endo’ for inside). Endocrine glands are ductless glands which release their secretions directly into the surrounding tissue and blood. The endocrine glands are not physically connected but are distributed throughout the body. Some of them also have non-endocrine functions (Eg. The pancreas also secrete digestive enzymes) and are called mixed glands. The main endocrine glands are the pituitary, the pineal, the thyro id, the parathyroid, the adrenal, the
Thursday, January 23, 2020
Vinegar :: essays research papers
Who’s been cheating on the vinegar? Aim: To investigate if the vinegars have been diluted by working out their concentrations. Scientific Background: Vinegar is an acid and there fore can be neutralised by an alkali. Acid + Alkali à salt + water Hydrochloric acid + Sodium Hydroxide à Sodium chloride + water Vinegar is a weak acid and therefore it only partially ionises in solution. CH3COOH ßà CH3COO- + H+ An alkali such as Sodium Hydroxide has a formula NaOH. If the alkali is strong then it ionises fully in solution. NaOH ßà Na+ + OH- When the acid H+ reacts with the alkali OH- the solution neutralises. Prediction: If the acid has been diluted there will be less H+ ions present in the volume used. Therefore to cancel the alkali more acid will be required. This is on the assumption that the alkali volume and concentration stay constant. Method:  ·Ã‚     Measure 10cm3 of 0.1m alkali into a measuring cylinder then place the solution into a 75cm3 conical flask.  ·Ã‚     Then add 2-3 drops of indicator to the alkali (it will go purple in colour)  ·Ã‚     Measure out 50 cm3 of the vinegar into a measuring cylinder and then place into a glass beaker.  ·Ã‚     Then using a dropper add the vinegar drop wise to the alkali until 1-drop changes the solution to colourless.  ·Ã‚     Replace the vinegar back into the measuring cylinder and record the volume of vinegar used.  ·Ã‚     Repeat this process twice more, recording results.  ·Ã‚     Then repeat the whole procedure for each different concentration of vinegar. Preliminary Work: Aim:- To find out which concentration of alkali will give accurate, measurable values. Concentration(M) Volume of acid(cm3) 0.1m 21.45cm3 0.5m 78.9cm3 0.75m 100+cm3 1.0m 100+cm3 2.0m 100+cm3 We decided from the results that the best measurable concentration of alkali would be the 0.1m concentrations. Investigation:      Test 1     Test 2     Test 3     Average Manufacturers’     10.27cm3     10.3cm3     9.73cm3     10.11cm3 Shop 1     10.3cm3     9.5cm3     10.25cm3     10.11cm3 Shop 2     18.4cm3     17.9cm3     18.4cm3     18.23cm3 Shop 3     40.1cm3     38.45cm3     35.7cm3     38.08cm3 Analysis: These results show that the vinegar from Shop 2 and Shop 3 have been significantly diluted with water or some other substance. The results obtained from shop1 show that its is very similar in concentration to the manufacturers’. Two of the results show that it is less concentrated than the manufacturers’, but one shows that it is more concentrated, this is impossible so its is most likely due to human error and not taking the readings properly. Concentrations: Manufacturers’= 1 ¸10.11 = 0.0989119683 Shop1 = 1 ¸10.11 = 0.0989119683 Shop2 = 1 ¸18.23 = 0.054854635 Shop3 = 1 ¸38.08 = 0.026260504 These results show an obvious difference in the concentration with the manufacturers’ being the most concentrated and shop 3’s being the least concentrated. Evaluation: The results from this experiment can be considered reasonably accurate we took the results quite accurately.
Wednesday, January 15, 2020
Greek and Etruscan Architecture
Greek & Etruscan Architecture Greek and Etruscan architecture began to take shape during the Archaic and Early Classical periods. There were similarities between the early Greek and Etruscan architectural styles, but there were far more differences. One of the most obvious similarities between the Greek and Etruscan styles was the use of a gabled roof. A gabled roof resembles a triangle in that it has a peak in the middle, and then has two straight slopes from the peak to each side wall. These roofs were often supported by the use of pillars or columns and is evident in both Greek and Etruscan architecture. Like Greek temples, Etruscan temples also featured an â€Å"inner chamber†known as a cella. A cella is typically an enclosed prayer room located in the center of a temple. Many of the structures made during this time period were comprised of wood or a mud-brick mixture, which is why there are few structures that remain today. Beginning with the Classical period, Greek architects began to set themselves apart from Etruscan builders by using more durable materials like limestone and marble to construct their temples and buildings. Greek temples were mostly built in the Doric or Ionic orders, while the Etruscans used the more primitive Tuscan order. The Doric and Ionic orders are very ornate, detailed, and aesthetically pleasing. They feature a column with a fluted design, which gives the pillar a thinner, taller, more elegant look. The Tuscan order on the other hand, is a very plain design and features columns with a simple base (foundation), capital (crown of the column) and frieze (horizontal section resting on top of the capital, but below the entablature). Etruscan pillars of the Tuscan order were often made of wood and did not have flutes. Some of the other major differences between Etruscan and Greek architecture can easily be seen when comparing the Greek Parthenon to an Etruscan temple. The Parthenon features a colonnade (row of columns) and steps around the entire perimeter of the complex, while the typical Etruscan temple would have a colonnade and steps in the front of the building only. The Parthenon also featured a one-room cella with two porches. One porch would lead into the cella and the other porch would lead out of the cella. Etruscan temples featured a three room cella with only one porch in the front. The final distinction between the Parthenon and a typical Etruscan temple would be in the artistic level of detail each one was designed with. The Etruscan temple was built in the very plain and basic Tuscan order, with no ornamentation built into the actual structure itself, but multiple statues of gods placed on the roof of the temple. The Greek Parthenon however, was built in both the Doric and Ionic orders, with hundreds of lavishly decorated statues, figurines and figural reliefs built into the pediments (triangular section above the entablature), metopes (a decorative band that fills the space between the frieze and the entablature), and frieze.
Tuesday, January 7, 2020
Security Technologies1 2 Essay - 910 Words
Security Technologies and Methodologies CMGT 582 Security Technologies Methodologies In today’s computer based world there are several potential and devastating threats like hackers, viruses, worms, and Trojans etc. to our computers, networks, and confidential information. So as to protect any computers, networks, and confidential information the installation of security applications is vital and hardware systems to protect our confidential information, computers, and networks. Some of the most popular Internet security systems are firewalls, intrusive prevention system, intrusive detection system, access control, and cryptographic tools and processes. However, there is no Internet security application or†¦show more content†¦An IDS can determine a thread and alert and block according to the configuration and settings as opposed to a firewall that can identify a threat only based on its configuration settings (Skillsoft, 2012). Firewall Firewalls are basically a wall between your computer or network and destructive forces from the Internet. They protect a company’s network and computers by filtering the information that comes through any Internet connection. They use certain methods like packet filtering, proxy service, or stateful inspection to protect computers or networks. This type of protection system is use for keeping computers or networks secure by running any information through filters and discarding all information that cannot pass through the filters. By creating a wall between the confidential information that a company needs to keep secure and any potential threat then the company will not need to worry about who has access to their confidential information. Intrusion Prevention Systems The intrusion prevention systems (IPS) are network security applications that examine the activities on a network or system for malicious activities. These systems identify malicious activity then they log the information that was retrieved from the malicious activity and then they try to block or stop the intrusion. â€Å"In reaction to a security threat, an IPS may drop packets, reset connections, generate alerts, or quarantine potentially threateningShow MoreRelatedEconomic Aspects of Agrarian Reform12715 Words  | 51 Pagesthe economic aspects of Agrarian reforms:\ 1. Introduction of markets for agricultural land to enable removal of fragmented farm holdings, encouraging consolidation of farm lands, introduction of commercial farming than than subsistence agriculture, 2. Free movement of agricultural goods within the country and to the extent possible across borders to enable farmers to specialize in such crops in which the land is most competitive internationally 3. Free market for retailing of agricultural goods,
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