Crayfish are decapods pertaining to the phylum arthropoda, which are invertebrates and contain an open-circulatory system.1 The system works by the hemolymph getting re-oxygenated in the gills before being transporting to the heart by brachio-cardiac veins and then pumped to sinuses that bathe tissues with oxygenated hemolymph.2 The crayfish contain a neurogenic heart that depends on neuronal input from cardiac ganglion.3 The neurogenic heart requires nerve impulses to produce contractions in contrast to a myogenic heart that can contract independently from the nervous system.3 The crayfish heart will beat due to the reaction of the ganglion to stimuli in the environment.4 Stimuli will affect the autonomic nervous system in the crayfish that control involuntary actions such as the heart rhythm.4 Neurotransmitters are the chemical signals in which the nervous system regulates both heart rate and contraction.3The autonomic nervous system breaks into two categories as parasympathetic system that is involved in relaxation of organs and the sympathetic system that will stimulate increased activity. Neurotransmitters can either increase or decrease heart rate by altering the patterns in neural activity of the heart.4 Crayfish are poikilotherms, which means they cannot metabolically thermoregulate thus conform to the ambient temperature in the water.
NAME: ZIYANDA.Q SURNAME: NANGU STUDENT NUMBER: 201502675 DUE DATE: 21-09-17 MAMMAL ORDER ASSIGNMENT ZOO 222 INTRODUCTION All species existence continues through reproduction. Without reproduction, life on earth would be terminated, every species would have been extinct by now. It is also said that reproduction is the basis and purpose of all life (Savage, 2016).For a species to continue to exist, it must reproduce.
In May 1991, zebra mussels were found in the Hudson River. 500 billion of these mussels were found in the course of a year. They looked seemingly harmless, but over time these mussels became a sort of threat. They were destroying the microscopic animals in the river. On the other hand, they also help out by a ton.
Have you ever come face to face with a huge great white shark? I bet you haven’t! In the short story, The Truth about Sharks by Joan Bauer. Beth is falsely accused for stealing a pair of jeans when she was really just trying to find an outfit for her Uncle Al’s birthday party. She starts as a nervous girl trying to prove herself innocent.
Blackfish, a documentary by Gabriela Cowperthwaite, a historically observed impact of the captivity of killer whales. This Documentary focuses on the orca Tilikum, who was captured off the coast of Iceland. On February 21, 1991, Sealand trainer Keltie Byrne fell into the pool with Tilikum. She was pulled to the bottom by Tilikum, tossed around, and drowned. It took Sealand employees two hours to recover her.
Shark Wars EJ ALTBACKER Did you know even under water there is a war going on, not by humans but by sharks. It is not all peace in Shark Wars written by Ej Altbacker. Shark Wars is about a reef shark named grey who causes trouble in his hometown. Eventually he will get banished and has to survive on his own. He ends up wandering into a different species of sharks territory looking for food.
You go into a store to get some chips or a Coca-Cola, soon, thereafter you walk to the back of the store, where the candy section is. As you walk and grab some potato chips, the cashier yells “Hey put that back!” You wonder to yourself, “am I allowed to buy this or does he not want me to?” You go up to the counter and before he explains what happened, and why he yells, he tells you to put your hands up and don't go anywhere. You sit there for a while looking like you're reaching for something on a top shelf, a man with a uniform and badge comes walking in through the front door.
Blackfish (2013) is an American documentary film directed by Gabriela Cowperthwaite and produced by Manuel V. Oteyza. The documentary primarily concerns the controversy of captured Killer Whales at the theme park Sea World, primarily that of Tilikum, an Orca responsible for the deaths of 2010 SeaWorld trainer Dawn Brancheau and two other individuals. The documentary begins with this incident but goes as far back to the 1970 's show the audience how young Orcas are captured in the wild and taken from their families and natural environments. Since its release at the 2013 Sundance Film Festival Blackfish has achieved both critical acclaim and caused controversy regarding SeaWorld 's treatment of its animals as well as retaliation from SeaWorld as to the legitimacy of the film 's claims.
The Great White Shark The Great White Sharks, known mostly because of their white underbellies, are one of the most powerful aquatic animals in the world. They can swim at about 25 Miles Per Hour (40 Kilometers per hour) because of their strong muscles and forceful tails. In addition to that, male Great Whites can grow around 11.5 to 13.1 feet long, while females can grow from 14.8 to 16.4 feet long. This paper will demonstrate how Great White Sharks are an important part of their ecosystem, how their diets work and will adequately describe their habitats. As predators in their ecosystem, Great White sharks help maintain the coral reefs and seagrass habitats.
Imagine a life where everything seems to revolve around one important element. And just as everything seems to be going well, it all changes within a matter of seconds. In the novel Shark Girl by Kelly Bingham, the protagonist, Jane Arrowood, had to experience this. She had a strong passion for drawing, but she was required to have her dominant arm amputated because of a shark attack. As she recovered slowly in the hospital, she showed her true inner strength when she learned to draw and write with her other hand.
The book “I Survived the Shark Attack” is a thrilling fictional tale about a boy who got attacked by a shark and survived. This tale is based on shark attacks in the summer of 1916. The story takes place in New Jersey in a small city called Elm Hills near the atlantic ocean. Chet Roscow is a friendly, brave, and adventurous 10 year old boy. His family is constantly moving because his father is always chasing new business ideas.
Sharks are driven to extinction because people want to eat their fins which serves no purpose to humans; shark fins have no nutritional value or serve any medicinal purpose. Finning is the inhumane practice of cutting off all of the shark’s fins and throwing the body back into the ocean. The sharks either drown are eaten by bigger fish or starve to death. Soon sharks are going to become extinct because of the 100 millions of sharks killed every year. If shark finning continues it will throw off the biodiversity of earth.
I am going to tell you all about whale sharks’ adaptations. First, whale sharks diet is that they do not attack They do eat shrimp. Second, there habitat is in the warmer areas. Some have been spotted in the cooler warters. Last there habits they are solitary creatures.
Marine organisms are animals, plants, and other living things that live in the ocean. A Marine biologist is a scientist who studies marine organisms and studies the bodies, behavior, and the history of marine organisms. They also study how marine organisms interact with each other and their environment. I have chosen to research about Marine biology because I would like to learn about sea life, the ocean, and its surrounding environment. To start off, a Marine biologist might study coral, crabs, fish, microscopic marine organisms, sea stars, seaweed, squid, or whales.
How differrent about two kind of large tropical shark,the whale shark and the tiger shark? First of all, the whale shark is light blue and has dots on its body whereas the tiger shark is dark blue and has a stripe pattern on its body. The whale shark has legth 10 metres and weight 9 tonnes whereas the tiger shark has length 4 metres and weight 500 kilograms. So,the whale shark is bigger and heavier than the tiger shark.
