Essays on Crustacean

Influence of Temperature and Neurotransmitters on Heart Rate in crayfish

TA for the Experiment: Introduction The cardiovascular system achieves key physiological functions in animals. Particularly, crayfish (Procambarus clarkia), also known as freshwater lobster, have been used to study physiological processes. This is because it is easier to study them in this species than in any other organism. In Crayfish, the circulatory system is open. Blood moves from the heart through the arteries and goes back through the open sinuses. Their heart is located in the cephalotorax, in front of the first abdominal segment, in the dorsal portion. Basic heart rate beat and rhythm in adult crustaceans depends on a ...

David Foster Wallace, in his essay Consider the Lobster, questions the ethics of being a non vegetarian consumer and whether it is morally alright to kill an animal for food. The essay addresses the Maine Lobster Festival (known as MFL) where lobsters are abundant in supply. While covering this story Wallace was faced with certain issues of morality towards killing of animals. In this paper I will discuss Wallace’s concerns, in addition to which I will give my response to the issue. Wallace begins the essay by introducing the MFL of 2003 where he describes how it is a ...

Abstract

Animals whose body temperatures are affected by their surroundings are said to be ectothermic. If an ectothermic organism is exposed cold conditions, the heart rate of the animal lowers. In high temperatures the heart rate of the animal is very high. Caffeine being a stimulant works by causing the nervous system to work faster. It further leads to the constriction of the blood vessels. The Daphnia magna sometimes referred to as the water flea lives in the fresh waters. It is an exothermic crustacean. The results of Table one shows that Daphnia’s heart rate lowers as temperatures the temperatures ...

Lab Report Comparing the Anatomy of Crayfish and Grasshopper

Introduction The aim of the investigation is to compare and contrast the external anatomical characteristics of two classes of the Phylum Arthropoda, Class Crustacea and Class Insecta. A crayfish was used to represent the Class Crustacea and a grasshopper was to represent the Class Insecta. Arthropods are the most abundant and diverse group of animals on the planet. The organisms in this Phyla share common characteristics which include: the body of most arthropods is covered with chitin hardened into an exoskeleton. In crustacean, the chitin is hardened by calcium. In insects, the chitin is tanned, chemically bonded with ...