November 20, 2012
Student #: 300109418
How a venomous lizard does not die if it bites its own tongue? Gila Monster ; retrieved from: http://www.google.ca/imgres?q=gila+monster+lizard&um.com/ Gila Monster ; retrieved from: http://www.google.ca/imgres?q=gila+monster+lizard&um.com/ Lizards belong to the class Reptilian, Scientists have said that reptiles have been on earth for about 200 hundred million years. Lizards are the largest group of reptiles with more than 4300 species around the world. Lizards are found in sub-tropical and tropical regions of the world. Lizards come in different shapes and sizes. Most of the lizards are quite small have four legs and have a fragile tail that can regenerate when part of it is gone. They look similar to salamanders. Lizards are ectoderms meaning they cold blooded, meaning they depend on outside sources like the sun, to raise and maintain their body temperatures. Eating habits for lizards is very different, it depends on the species. Some lizards feed on iguanas which are insects, some eat rodents, and some eat both rodents and insects. Lizards use their teeth to scare predators off as protection. Very few lizards happen to be poisonous and use their venom as a defence. Other species of lizards rely on camouflage such as the chameleon that is able to change its colour according to its surroundings, as a defensive strategy. Females of most lizard species lay eggs and then are usually left to hatch on their own. The most well-known venomous lizards are the Gila monster and he Mexican Beaded Lizard. They are found in Mexico and south west of United States. These lizards are classified in the Family Helodermatidae which has one genus containing only these two species. Both of these lizards have been known as the only venomous lizards for a long time. But more recently discoveries have been made that there are more lizards which are venomous. The venom that both of these lizards produce the Mexican Beaded Lizard and the Gila monster has toxin secreting glands that are smaller than snakes. They bite with their teeth rather than fangs. In an article it states that, “venom enters the bite wound by dripping down grooves in the teeth rather than being injected through the fangs” (animal –world). Lizards tend to hang on to their victims, making them hard to remove once they have bitten. Dry bites in which no venom is released may occur (animal -world). Mexican Beaded Lizard; Retrieved from: http://www.google.ca/imgres?q=mexican+beaded+lizard Mexican Beaded Lizard; Retrieved from: http://www.google.ca/imgres?q=mexican+beaded+lizard
The human body is constantly working to provide the energy and enduring processes needed to maintain life. Homeostasis needs to be maintained to prevent a decrease of energy. Homeostasis is the regulation of internal processes to maintain a steady state (Campbell et al, 2008). The body will remain in a state of imbalance which can lead to death, if homeostasis is not maintained. Homeostatic mechanisms adapt and evolve due to great changes in the external environment. However, what maintain this balance are the kidneys, liver and brain. The kidneys have a responsibility of controlling blood water level, re-absorption of substances in blood and regulation of salt and ion content in the blood. Excretion of urea and other wastes is controlled by the kidneys (Godbole, 2011). Immune System
The immune system is an incredible complex. It can recognize and remember millions of different enemies. It can “produce secretions and cells to match up with and wipe out nearly all of them” (National Institute of Allergy and Infectious Diseases, 2007). According to the national institute of allergy and infectious diseases the immune system “is a network of cells, tissues and organs that work together to defend the body against attacks by foreign invaders.” There are...