This essay Earth Worms has a total of 438 words and 3 pages.
- Prostomium - a small fleshy lobe that extends over the mouth, used to help dig through the soil
- Mouth - the entrance for food into the digestive system, located under the prostomium
- Pharynx - A tube at the beginning of the digestive tract that creates a sucking action to remove food particles from the soil, located just behind the mouth
- Esophagus - a narrow passage in the digestive track that connects the pharynex to the crop
- Crop - a temporary storage area in the digestive track , food waits here before it passes to the remainder of the digestive track
- Gizzard - an area in the digestive track where strong muscles grind the food in preparation for digestion
- Intestine - Nutrient digestion and absorption take place in this part if the digestive track.
- Anus - Digestive wastes are expelled through this opening located on the posterior end of the worm.
- Brain - a center of nerve cells that coordinate all of the activities of the worms body
- Ventral nerve cord - A cord of nerves that runs the length of the body along the bottom or belly of the worm. All nerve impulses to and from the brain are carried din this cord
- Aortic Arches - a group of 5 muscular tubes that pump blood through the circulatory system of the worm
- Ventral blood vessels - a tube structure that carries blood from the heart to the posterior of the worm located on the bottom of the worm,
- Dorsal blood vessel - gathers blood from the capillaries in the body and returns it to the heart for recircutation located in the back or top of the worm
- Seminal Vesicles (openings) - male reproductive organs
- Ovary (oviduct ovaries) - egg sack, female reproductive organs
- Seminal Receptacles (openings) - temporary storage areas for the male sperm until the eggs are ready to be fertilized
- Nephridium - coiled tubes in the body of a worm that collect and excrete liquid wastes from the body of the worm.
- Clitellum - a swollen area of band around the mid section of the body of the worm. Materials secreted from the clitellum form a cocoon in which the eggs are hatched and the young worms develop.
- Setae - Bristle structures found on the skin of the worm. Four pair of Satae are found on each segment except the first and last. Satae are used for movement.
- Segments (somites) - The divisions in the skin of a segmented worm. The internal segments are called septum. There can be over 100 segments in the body of a worm.
Fish GillsFish Gills Not all animals have lungs. Many animals live in environments where lungs would be efficient enough for survival. Gills are another type of respiratory system, which are very efficient at removing oxygen from water: there is only 1/20 the amount of oxygen present in water as in the same volume of air. Gills greatly increase the surface area for gas exchange and they occur in a variety of animal groups including arthropods (including some terrestrial crustaceans), annelids, fish, and a
The Making Of The CatThe Making Of The Cat R. Roger Breton Nancy J Creek ------------------------ Soup or Sandwich IN THE VERY BEGINNING, about 4.6 billion years ago (give or take a few years), a small ball of rock, water and gas had come to be and immedi- ately set about the process of combining its atoms into more and more complex arrangements. Thus began that most wondrous story, the evolu- tion of life on Earth. For the first 2.1 billion years of the Earth's existence, the Archeo- zoic Era, life very slowly evol
Environmental Science Environmental Science Human kind has entered a brand new relationship with the earth. The constant and increasing pressures we are exerting threaten our planets ability to sustain life itself. Change-in the way we think , and in the way we live-is needed now. Global warming is the most urgent environmental problem the world will face in the next decade and the next century. Few, if any, trends are more important to our future than climate change caused by human activities. Scientist around the
Brittle StarBrittle Star BRITTLE STAR PHYLUM: Echinodermata SPECIES: Ophioderma panamense GEOGRAPHIC RANGE: From Peru and through Southern California HABITAT: They have been observed in the mid and low tide zones, abundant on the sea floor underneath rocks and in crevices and moving about tide pools and in available habitats in southern California NICHE: Omnivoire and filter feeder ADDITIONAL NOTES: Sometimes often called serpent starts due to their snake like movements. The mouth is located on the undersid
Chemistry ResearchChemistry Research CHAPTER 32 The tallest tree is the Redwood (Sequoia sempervirens) approx 110 m The tallest Angiosperm is the Australian Eucalyptus regnans Water Uptake and transport (Fig. 32.1) = water is essential because: transport solute, cool the body, photosynthesis and Turgor pressure Osmosis- movement of H2) through a semi-impermeable membrane Osmotic potential ( o)-depend on dissolve solute: Hi concentration means more negative o. Isoosmotic-two solution with same o; Hypoosmotic- solu
BiodiversityBiodiversity Diversity Essay American biologist R. H. Whittaker in 1959 described a classification system of five primary kingdoms: plants, animals, fungi, protists, and monera. Kingdom animalia cover all taxonomic kingdom all living or extinct animals, an example of an animal is a human. Humans thrive off of one thing or another in each of the five kingdoms. The monera kingdom is the lowest division of rhizopods. Bacteria belong to this kingdom. There are many useful and harmful bacteria in the