Animal Dissection Lab Report

It lacks a backbone, but has a nerve cord that runs down its back and a rod that runs the length of its body parallel to the nerve cord that supports the body (notochord). Humans have a notochord as an embryo, but it breaks up and becomes part of the disks that lie between our vertebrae. Also shared with Amphioxus are gill arches, the bar of cartilage associated with each arch and the cartilage that form jaws, ear bones and our voice box.

The octopus has several main organs that are vital to its survival; the brain for its intelligence; the ink sack for its defense; and the arms for capturing its prey. This paper will discuss these different organs and how they have evolved physiologically to its environment.

When society thinks about starfish, perch, chordate, and fetal pig they become extremely curious about how their bodies operate because of how they are made up. I will give a brief synopsis of all animals before going into major detail about them. According to the online website named dictionary.com, Starfish are any echinoderm of the class Asteroidea, having the body radially arranged, usually in the form of a star, with five or more rays or arms radiating from a central disk; asteroid (dictionary.com). It is known that a chordate is an animal belonging to the phylum Chordata, composed of true vertebrates and animals having a notochord (dictionary.com). According to research, a fetal pig is an animal in the phylum Chordata and class Mammalia (dictionary.com). A perch is known to be a certain kind of fish with very spiny fins (dictionary). Starfish, perch, chordate, and fetal pig are some very interesting animals that possess some exclusive qualities both similar and different.

On this image, we see the external dorsal side of a preserved crayfish. As part of the largest animal phylum the Arthropoda, the body of the crayfish is segmented, with jointed appendages and exoskeleton. The paired antennae (1) are long appendages located the front of the mouth and modified for help the animal to sense touch and taste. The antennules (2) are shorter, also paired with the same function but they also help to maintain balance. The chelipeds (3) are located on the front of the thorax, and they are responsible for defence and grasping food. On the at ventral part of the thorax, we found four pairs of walking legs (4), with these legs the crayfish changes locations on the bottom of freshwater lakes, streams and also on land. They

Crayfish: In our dissection of the crayfish we found that it used gills instead of lungs, like the clam. Its gills allow an exchange of carbon dioxide for oxygen. Much like the worm, the crayfish has segments that split its body into several parts. Crayfish segments often become fused, so parts of the crayfish may be multiple parts. Much like a skeleton the crayfish has a hard exoskeleton. The structures it uses to capture its prey or securing and eating food are its chelipeds, mandibles, maxillae, and maxillipeds. Rows of chitinous teeth line its stomach to help further break down its food.

The Amphioctopus Marginatus is of the Kingdom Animalia because like other members of this kingdom, it is both multicellular and is a heterotroph. This species is also part of the phylum Mollusca because like other mollusks, it has a coelom, (letter B on the first phylogeny tree), a visceral body mass, and a mantle (letter C). Furthermore, because it is not part of the phylum Chordata, it does not have the notochord (letter A) (Doc 2). It is of the class Cephalopoda, because like other members of this class, such as Asteroceras Confusum, the Marginatus has a merged head and foot (letter F), a siphon (letter D), and a ring of tentacles (letter E) surrounding the head (Doc 1). As a member of the order Octopoda, this species has eight arms

Steele, V.J., and Oshel, P.E 1989. Ultrastructure of the attachment cells of the organ of Bellonci in Gammarus setosus (Crustacea, Amphipoda). Journal of Morphology, 200(1), 93-119.

From inspecting the crayfish I believe that it's more complex than what I guessed it was. Based on the organs and the way their organ system runs.

The Excretory system is carried on by nephridia, these are found in different pairs along the body segment. They appear as small white fibres on the dorsal side.

Sea Cucumbers belong to the phylum Echinodermata, the order Aspidochirotida, and the family Holothuriidae. It has bilateral symmetry, three tissue layers, segmentation and blind sac gut type allows it to be classified as an Echinodermata, while its respiratory trees and calcareous ring put it in the order Aspidochirotida. The presence of only the left gonad and tentacular ampullae classifies it as a Holothuriidae. Sea cucumbers have a coelom that develops through enterocoely, making them a deuterostome. The coelom originated in sea cucumbers to transport coelomic fluid throughout the

Most people can feel bad for the people of Baltimore with the furious nature from April 18, 2015 - May 3, 2015. It’s really easy to feel a lot of compassion for the people who’ve suffered from police brutality, poverty, and injustice; even if you’ve never experienced either. Burning and looting a CVS store would be a lot harder to understand and would hardly seem to have anything to do with protesting the actions of the Baltimore Police Department. President Obama decried the Baltimore riots as “senseless act of violence and destruction.” Baltimore Mayor Stephanie Rawlings-Blake also seemed disheartened. “We worked so hard to get a company like CVS to invest in this neighborhood,” she said, “this is the only place that so many people have to pick up their prescriptions.” Why would anyone burn down the only CVS in their neighborhood?

Logic: The option above was chosen because ctenophores, cnidarians, and bilaterians were assumed to be under similar environmental pressures. The notion of convergent evolution, the alternative option, often suggests not closely related organism adapt to similar niches. With the given data, there is no overwhelming argument that would place

Throughout the first few weeks of working on the Mental Heath Unit at Victoria Hospital, I was exposed to many new and different situations in regards to patient care. One situation in particular that stuck out to me occurred during my first week when I was working with a patient who had schizophrenia and paranoia. During this time, I was required to give this gentleman his intramuscular (IM) depot injection of Invega Sustenna, which assists in managing the symptoms of schizophrenia. For confidentiality reasons, this patient will be referred to as Roger for the remainder of the reflection.

In the article, “Why humans Join Groups,” written by Ed Fisher, a columnist writer for the Morning Sun, explicates the social behavior of humans, leaning on why our species are wired to form “complex relationships” and why we as human avoid solitude to capitalize in certain benefits a group of people would provide. Fisher explores that by having a “[conformed] belief…” humans detect a sense of affiliation in society. As a result, we as the human race had revolutionized our own behavior causing differences within various kinships---causing ethnic lines/borders. In other words, as the human species advance, nations develop. What is considered a nation?

The nervous system is made up of basic units called neurons. The main role of the neurons is to receive, integrate and transmit information throughout the body. There are some neuroglial cells found in nervous system aswell which provide support to the neurons by giving protection and nourishment Neurons have nerve processes that looks like finger like projections extended from the nerve cell body. They also contain axons and dendrites which enable them to transmit signals throughout the body. Normally, axon carry signals away from the cell body and dendrites carry signals toward the cell body according to Regina Bailey (2013). Neurons have three different shapes: bipolar, unipolar and multipolar where bipolar has two neuronal processes coming out of the cell body, unipolar has only one neuronal process coming out of the cell body and multipolar has many neuronal processes coming out of the cell body.