Crayfish Digestion System Essay

The internal environment of the stomach has strong acids and active enzymes that trigger the occurrence of chemical reactions that begin to break down the ingested food. Thereafter, the process of absorption follows, whereas absorption of nutrients occurs in the intestinal tract. The process of absorption is short and is followed by excretion via the cloaca. Similarly, the liver and the pancreas assist in the process of excretion. Additionally, urinary and fecal waste travel through urinary passages and generative canals that connect to the cloaca and are emitted from the cloaca as jelly like, brown droppings.

1. Introduction: This report will mainly focus on some adaptation features creatures which live in the lake and wetland freshwater habitat have. 2.

The circulatory system of the blackworm is closed containing arteries, veins and a muscular pumping dorsal vessel which contracts enabling blood to be moved from the posterior end, where gas exchange occurs, to the anterior region, the head of the

Unlike our cardiac chambers earth worm circulate blood through vessels, which inspired so deeply that I started thinking to make my career in the

They have also theorized that the crabs “scoop up the bacteria” and consume it (Bliss). So it is like they are eating their own excrement. How and what these animals eat are all different and makes them the species that they are which provides the means for them to adapt and evolve to their

The snail inhales oxygen by lowering the cavity floor, letting in oxygen flow to the cavity and the air will then spread into the bloodstream, due to the thin tissues. The snail will later on shut the pneumostome and raise its cavity floor, letting more oxygen go into the bloodstream. For the snail to exhale, it will have to raise both its pneumostome and its cavity floor, forcing the oxygen to come out of the snail. Since garden snails are terrestrial species, they have nocturnal habits.

Many organisms use energy to perform their cellular functions. That energy comes from the energy that is stored in food then converted to adenosine triphosphate or ATP. ATP can be obtained with or without oxygen, aerobic respiration and anaerobic respiration. Aerobic respiration produces carbon dioxide (CO2) as a by-product while anaerobic respiration produces Ethanol (C2H6O) or Lactic acid (C3H6O3). In aerobic respiration the “CO2 produced during cellular respiration can combine with water to produce carbonic acid.” While CO2 is produced, the amount of CO2 produced is different depending on the organisms, in this case crayfish. To test the changes in pH, NaOH is used to neutralize the carbonic acid produced by the crayfish, by which the

Recently, the famous clear waters of Crater Lake and the Mazama Newt that resides there have been threatened by the expanding crayfish population. In 1915, humans wanted to provide food for the non-native fish in the lake, so they introduced crayfish. In addition to threatening the newt, a drastic change in population threatens the magnificent clear waters of Crater Lake. Officials have attempted to place large, metal underwater barriers to try and slow the spread of the crayfish. The 18-inch tall metal barriers would be placed in certain spots around the lake, perpendicular to the shoreline, similar to a wheel and its spokes. The barriers would be placed so that the crayfish will be separated from the newts, since about two-thirds of the lake is swarming in crayfish.

Their larger and stronger hearts allow them to pump blood through their bodies faster than we can, and this allows them to get more oxygen to their cells. Without a stronger

The digestive system is responsible for chemically and mechanically breaking down food and includes organs such as, mouth, esophagus, stomach, small intestine, rectum, anus, and additional accessory organs. These organs all aid in the breakdown of food. Food is broken down mechanically by chewing and churning in the stomach, and chemically by acidic enzymes in the stomach and in the small intestine which receives enzymes from the pancreas that are specifically designed for the breakdown of nutrients. Once the food and nutrients are broken down, the excretory system removes whatever the body decides is waste by filtering blood in the nephrons of the kidneys and turning it into urine which is then collected in the bladder and removed from the body when the bladder is

Introduction Metabolism is the sum of all anabolic and catabolic reactions within a living organism to sustain life. The energy required to perform these reactions is provided by oxygen in the form of ATP, therefore the oxygen consumption rate can be measured to determine the metabolic rate. Since oxygen is obtained through respiration, the efficiency of an organism’s respiratory system affects its metabolism. Previous studies have shown that caffeine affects the human respiratory center and occasionally dilates bronchus. It can thus stimulate human respiration and increase the metabolic rate (Haggins et al, 1915).

The blood cells release oxygen, which passes through the capillary walls into nearby tissue. Tissue then releases carbon dioxide through the capillary walls into the red blood

There is also strong acid released by the glands in the lining of the stomach which helps break down food into a more useable form and also aids in the destruction of most ingested bacteria. After the contents have successfully been broken down they are released into the small intestine. The small intestine is a 22 foot long tube that helps to break down the food with enzymes released from the pancreas and bile released form the liver. In this organ the process of Peristalsis is at work, pushing the food further and further through the small intestine towards the colon. These movements are stimulated by the presence of chyme.

If fishing with a worm, try inflating the worm with air using a syringe (there are special worm syringes for this that you can buy). By doing this you can float the worm off the bottom and hopefully right in the fishes' faces. If you just fish a worm on the bottom without doing this they are harder for the fish to see and they can crawl under things and hide.

The digestive system is located around the stomach area. Along with the digestive system, many other organ systems all work together to create an organism. An example of this would be if a person eats a sandwich and then goes for a run. During the run, the circulatory system helps the body breathe, the muscle system helps the bones move, and all the while the digestive system digests the food. Later on, the excretory system gets rid of the waste, or food that the body can’t use for nourishment.