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Tasmanian Devil

Mammal Presentation Day: May 2nd, 2011

Black Ryder

on 3 May 2011

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Transcript of Tasmanian Devil

Tasmanian Devil Digestive System A Tasmanian devil has a simple digestive system, meaning that it does not regurgitate its food, it has only one stomach, and its intestines and stomach are not particularly enlarged.

Food travels from the mouth, through the esophagus, and into the stomach, where acids break it down. Eventually the intestines receive the food, first the Small Intestine and then the Large Intestine. The small intestine pushes the food along by villi, and the bloodstream takes in nutrients. The large intestines lack villi, but they give some more nutrients to the blood stream and push the wastes out the anus.
Nervous System Mammals have the most complex nervous system on the planet, with humans being the most advanced.

The nervous system of a mammal is based on the brain and the spinal cord, which sends and receive signals from the rest of the body. Signals from the body are sent through nerve endings (or receptors) to the brain, where neurotransmitters send a signal to allow all mammals to feel pain or other sensory information.

The nervous system of a mammal is divided into four main parts: the central nervous system, the peripheral nervous system, the somatic nervous system and the autonomic nervous system. Each of the parts of the nervous system of a mammal works in a different way, and performs a different job in the body to maintain health and to allow you to react to the world. Most mammals, excepting Monotremes and Marsupials, are placental mammals. Yaks, rabbits, cows, hippopotamuses, bats and humans all fall within this category.

In all other vertebrates the developing embryo is separated from its mother's body by the amniotic membrane which surrounds the egg. The reason for this is that after fertilisation the embryo takes on its own existence as a separate organism. This is because the mother's auto-immune system (her internal defence mechanisms) will recognise the new embryo as a foreign body and attack it. The amniotic membrane isolates the young embryo from all biological interaction with its parent, thus protecting it from attack.

Reproductive System The circulatory system forms a complex communication and distribution network to all physiologically active tissues of the body. A constant, copious supply of oxygen is required for sustaining the active, heat-producing (endothermous) physiology of the higher vertebrates. The efficiency of the four-chambered heart is important to this function. Oxygen is transported by specialized red blood cells, or erythrocytes, as in all vertebrates. Packaging the oxygen-bearing pigment hemoglobin in erythrocytes keeps the viscosity of the blood minimal and thereby allows efficient circulation while limiting the mechanical load on the heart. The mammalian erythrocyte is a highly evolved structure; its discoid, biconcave shape allows maximal surface area per unit volume. When mature and functional, mammalian red blood cells are enucleate (lacking a nucleus). Circulatory System The supporting tissues of animals which often serve to protect the body, or parts of it, and play an important role in the animal's physiology.

Skeletons can be divided into two main types based on the relative position of the skeletal tissues. When these tissues are located external to the soft parts, the animal is said to have an exoskeleton. If they occur deep within the body, they form an endoskeleton. All vertebrate animals possess an endoskeleton, but most also have components that are exoskeletal in origin. Invertebrate skeletons, however, show far more variation in position, morphology, and materials used to construct them.

Skeletal System Each cell in an animal’s body must receive O2 and give off CO2. This is easier for smaller organisms. In the vertebrates, the blood carries O2 and CO2 to and from the cells, but these gases must also be exchanged with the outside air or water. In insects, the tracheal system takes air directly to the organs and O2 is usually not carried in the blood. Mammals and some other vertebrates have have lungs to exchange air. However, the lungs are ventilated differently in different groups of vertebrates. For example, a frog opens its nostrils and expands the floor of its mouth to draw air into its mouth. Then it closes its nostrils and uses the floor of its mouth to push O2 into its lungs. Mammals are unique in possessing a diaphragm to pull O2 into the lungs. As the diaphragm contracts and the rib cage rises, a negative pressure is created in the chest cavity causing the lungs to expand and air to be drawn in Respiratory System Facts Type: Mammal

Diet: Carnivore

Average life span in the wild: Up to 5 years

Size: 20 to 31 in (51 to 79 cm)

Weight: 9 to 26 lbs (4 to 12 kg)

Protection status: Endangered

Did you know? When confronted, a Tasmanian devil will often yawn at its tormentor as if pretending to be unbothered by the threat.

Size relative to a 6-ft (2-m) man: Illness discovered in the mid-1990s has killed tens of thousands of Tasmanian devils. Called devil facial tumor disease (DFTD), this rapidly spreading condition is a rare contagious cancer that causes large lumps to form around the animal's mouth and head, making it hard for it to eat. The animal eventually starves to death. Quiz TIme 1. In the Nervous System of a mammal, it's divied into four main parts. Name thoses four parts.
2. Each cell in an Animal's Body must recive __ and give off ___.
3. What is the illness called that killed Tens of Thousands of Tasmanian Devil's? Quiz TIme ANswers 1. The Central NS
The Peripheral NS
The Somatic NS
The Autanomic NS 2. O2 and CO2 3. Devil Facial Tumor Disease
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