how do lizards maintain homeostasis?
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since lizards are ectotherms i.e. cannot control their temperature via a special biological mechanism they must rely on behavioural temperature regulation.\nLizards bask in the sun when their body temperature is too low and seek shade when it is to high. Whilst in the sun all reptiles must be extra cautious since their temperature increases in a number of ways: apart from the obvious amount of radiation from the sun giving them heat directly, this has another effect as well, the increased temperature causes the enzymes that control their metabolism to work more efficiently metabolising faster and generating more heat from chemical reactions.\nReptiles generally suffer from generating heat faster than they can get rid of it so they must constantly change surroundings
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I can show you a website that's a little technical, but should help.\n\nThe basic answer is, not really.  Most lizards are designed not to waste water, so they don't "pee" in the same sense a dog or a cat does.
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the amphibian deposits its egg with all the nutrients it will ever have in its yolk.\n\nmammals carry their eggs and the maturing baby, thus providing it with nutrients via the placenta.  on a side note, monotremes, or egg-laying mammals provide their young with big yolks
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Homeostasis \nHomeostasis is the physiological process by which the internal systems of the body (e.g. blood pressure, body temperature, acid-base balance) are maintained at equilibrium despite variations in the external conditions. \nThe body can maintain the fluid levels using the kidneys, these organs filter out harmful chemicals and excess liquid into the bladder from which the urine is then expelled.  Body temperature is regulated somewhat by the skin, example, if you are hot you begin to sweat and this helps to cool the body, if you are cold you shiver this helps to raise, the body temperature.
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They hold their breath. They can hold their breath for a very long time because they have a very efficient metabolic rate that allows them to control the amount of oxygen required by their bodies. Their heart rate drops and blood supply to external parts that do not require so much oxygen are reduced.
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The trachea in reptiles is similar to that of higher vertebrates, with well-developed hyaline rings.  However, there is no mucociliary transport mechanism to aid the removal of foreign substances from the respiratory tract.  Furthermore, the absence of a diaphragm prevents the animal from coughing. \n\nThe lungs are similar to the avian-type system with a series of reticulated open-ended sacs and many capillaries in close proximity.  The cranial part of the reptile lung is the gaseous exchange portion, while the caudal part functions as an air sac.  The latter may act as a reserve of air during periods of apnoea. \n\nAlveolar macrophages are present in the reptilian lung, but may display poor bacterial removal if the animal is being kept below its optimal temperature. \n\nIn snakes, the right lung is larger than the left, and generally stretches from the heart to the kidney.  It may extend even further down to the cloaca in some aquatic snakes.  Some snakes have a tracheal lung on the dorsal aspect of the trachea, which enables the snake to breathe when the main lung is compressed by swallowed prey.
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to maintain the concentration level of the cell
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DESCRIPTION: \n\nThis unusual mid-sized stocky agamid lizard has prominent spines along its sides and a large, essentially triangle-shaped head. Forming a sort of shield around the snout is a spiney jaw pouch which, when swollen, looks like a beard and makes any predator think twice before attacking. This wide-ranging species shows considerable geographic variation; its basic color varies from shades of brown, gray, and reddish-brown to bright orange. The ventral surface ranges from pale to dark gray, with white elongated spots edged with black. Mature males have dark "beards" which become black during courtship and breeding. Adults can grow as large as ten inches in body length or two feet in total length, including the tail. Males are larger than females. \n\nII. GEOGRAPHICAL RANGE AND HABITAT: \n\nThese lizards are native to Central Australia. They prefer semi-arid to arid woodland habitats. Time is spent both on the ground and in trees. They may be found perched on bush branches and even on fence posts. \n\nIII. DIET:\n\nBearded dragons are omnivorous and consume many types of insects, small vertebrates, and vegetation including fruits and flowers. \n\nIV. LIFE CYCLE/SOCIAL STRUCTURE:\n\nSexual maturity is reached at one to two years of age. Mature females typically lay clutches of eleven to sixteen oblong leathery eggs in early summer. The eggs are laid in nests dug in sandy soil and the unattended young hatch 3 months later. \n\nV. SPECIAL ADAPTATIONS:\n\nA bulky body and the habit of basking allows them to store heat, making it possible to operate at lower temperatures than other lizards. They can also survive higher temperatures for several hours, since they can regulate body temperature by evaporation. \n\nVI. INTERPRETIVE INFORMATION:\n\nWhen intimidated, they flatten their bodies and stand erect with mouth gaping. The light-colored mouth lining, spines bordering the lower jaw and puffed-out blackish beard give a formidable appearance. This defensive display has earned these lizards the common name of "bearded dragon". \nAggressiveness to other members of the group is shown through "body language". The tip of the tail is slightly curved at the end and the head is bobbed rapidly. Submission is signaled by rotating the arms in a full circular motion, which looks a bit like waving. Ritualistic sparring matches take place in which both animals are in flat postures, beards and tails up and outward; they circle each other, biting at one another's tail, but usually no damage is done. \n\nTheir ability to change shades of color, from light to dark, helps them to regulate body temperature. Color changes can also depend on emotional state, and may also be used for concealment. When injured, sick, or dying the back becomes black and the legs pale yellow. \n\nAustralian desert lizards often make their escape by rising on their hind legs and running bipedally. They cannot run as fast as when using four feet, but perhaps this behavior aids in temperature control. They lift their bodies from the hot ground to lose the heat they generate in running. This reduces the amount of heat they take in from the ground and increases the cooling airflow over their bodies.
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No!\nCold-blooded animals, such as fish and reptiles, are called ectotherms, meaning that they cannot control their internal temperature.
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All sorts of factors affect the suitability of the human body fluids to sustain life; these include properties like temperature, salinity, and acidity, and the concentrations of nutrients such as glucose, various ions, oxygen, and wastes, such as carbon dioxide and urea. Since these properties affect the chemical reactions that keep bodies alive, there are built-in physiological mechanisms to maintain them at desirable levels.\n\nHowever, it should be noted that homeostasis is not the reason for these ongoing unconscious adjustments. Homeostasis should be thought of as a general characterization of many normal processes in concert, not their proximal cause per se. Moreover, there are numerous biological phenomena which do not conform to this model, such as anabolism.
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The sun provides energy to living organisms of the Earth.  There are autrophs and heterotrophs.  Autotrophs (like plants) use sunlight to turn CO2 and Water, which cannot be further oxidized as fuel into GLucose, which can be burned by a cell as a source of fuel.  Low rung food chain heterotrophs eat autotrophs (these are herbivores) and get their calories (food is a source of chemical potential energy) from the glucose (and some other chemicals) made by autotrophs.  \n\nHigher level heterotrophs eat the lower level heterotrophs, getting their calories from proteins and fats of the herbivores they are eating.  The calories contained in the proteins and fats of the herbivores is derived from the calories of the autotrophs.  In essence, the calories from food on this planet are derived from energy from sunlight that plants have converted to chemical form.
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A few of many.\n\n1) Nocturnal habits. By minmising activity during the hottest parts of the day less water is lost to cooling, in addition to avoiding the high temperatures.\n\n\n2) Burrowing. Almost everysmall desert animals burrows> But many large animals also burrow in the desert. Things like warthogs, spotted dogs, wombats and hyaenas all burrow. Burrowing is a way of avoiding the sun. In addition the air temperature below the ground is always fairly constant, menaing it is cooler by day and warmer at night. The burrow also traps any moisture the animal breathes out or loses to sweating, slowing further loss.\n\n3) Seasonal activity. Most deserts have distinct wet and dry seasons. Many desert animals like shrimp or frogs will will hibernate in some form through the dry part of the year and only reemerge when it rains.\n\n4) Migration. Many desert animals are migratory or nomadic. This allows them to follow the available water and food. Animals like kangaroos, wildebeest, camels and bison are all nomadic or migratory in desert environments.\n\n5) Evolutionary adpation. This is a grab bag that covers all sorts of things. For exmaple many desert animls have highly efficient kidneys so they don't lose much water in urine. Camels have specially shaped blood cells that won't clog up their veins when their blod thickens as they dehydrate. Sidewinder snakes have evolved a method of moving over hot shadeless ground that minimises the amount of that they absorb. And so on.
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endocrine glands dump hormones and proteins directly into the bloodstream.  They have a large bloodflow to them, so they can release their products into that blood stream.  Endocrine glands are responsible for a majority of the homeostasis of the body.  look on wikipedia.org for more info.
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the nervous system consists mainly of the brain and the spinal chord. when there is a change in the environment which causes a change n the body, it is picked up by receptors. they send a message to the brain via the peripheral system. the brain (usually the hypothalamus) coordinates a response to counteract the change. they send a message to the effectors via the peripheral system again which initiate the response. this brings the body back to its optimum position, maintaining homeostasis. &#92;\n\nnote: the peripheral system is a branching network of neurones.
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reptiles normally dont live in cold areas due to that they are cold blooded.  this means that they need heat to raise their body temp. so they can begin to move, eat, reproduce, etc.  that is why u normally see them sunning themselves.\nfrogs lay alot of eggs due to the amount of predation over the eggs.  the more eggs laid the greater chance of a few to grow to adult frogs.  frogs are not the only animal to lay a large amt of eggs.  this also goes to other toads, reptiles, fish and insects.
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Both fish and reptiles are exothermic organisms.  this means they depend on their environment to raise and lower their body temp.  For example the alligator will go lay in the sun.  This behavior will raise the body temp.  So in fact the term warm blooded is not accurate.  Because in the case of the alligator laying in the sun, their blood is now warm blooded.  When the alligator moves to a shady area the blood is now cold.
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Lizards _do_ have an excretory system, just like all vertebrates. \nTheir kidneys produce uric acid as final product of nitrogen metabolism, and uric acid combines to form salts (urates) that appear as whitish crystallized matter. \nThe end of the excretory ducts of lizards open at a cloaca, that also includes the end openings of the reproductive system and the digestive system. The excretions of lizards are of 3 types: brown solid matter (feces from the digestive system), white chalky semi-solid matter (urates), and clear liquid (urine). Often the feces and the urates are discharged together, that's why you see the white spot. \n\nThe same happens in birds, btw.