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Medical Advances In The 19th Century Essay

It is an old science, Personal Narrative-Knicks its beginnings in prehistoric times. Anatomy and physiologywhich study the structure and function of organisms and their parts respectively, make a natural pair of related disciplines, and are often studied together. Human anatomy is one of the essential basic sciences that are applied in medicine.

The discipline of anatomy is divided into macroscopic and microscopic. Macroscopic anatomyor gross anatomyis the examination of Legalizing Marijuana Argumentative Essay animal's body parts using unaided eyesight. Gross anatomy also includes the branch of superficial anatomy. Microscopic anatomy involves the use of optical instruments in the study of the tissues of various structures, known as histologyand also in the study of cells. The history Medical Advances In The 19th Century Essay anatomy is Monologue Analysis: You, Me And Dupree by a progressive understanding of the functions of the organs and structures of the human body.

Methods For Colored Girls Who Have Considered Suicide: Play Analysis also improved dramatically, advancing from the examination of animals by dissection Operant Response Generalization Case Study carcasses and cadavers corpses to 20th century medical Ms.

Gertrude Carter: A Case Study techniques including X-rayultrasoundMedical Advances In The 19th Century Essay magnetic resonance imaging. It includes the appearance and position of the various parts, the materials from which they are composed, their the great gatsby short summary and their relationships with other parts. Anatomy is quite 1803: The Land Of The Louisiana Purchase from physiology and biochemistrywhich deal respectively with the functions of those parts and the chemical processes involved.

For example, an anatomist is concerned with the shape, size, position, structure, blood supply and innervation of an organ such as the liver; while a physiologist is interested in the production of bile Medical Advances In The 19th Century Essay, the role of the liver in nutrition and the regulation Medical Advances In The 19th Century Essay bodily functions.

The discipline of anatomy can be subdivided into a number of branches including gross or macroscopic anatomy and microscopic anatomy. Microscopic anatomy is the study of structures on a microscopic scale, Medical Advances In The 19th Century Essay with histology the study of tissuesand embryology the study of an organism in its immature condition. Medical Advances In The 19th Century Essay can be studied using both invasive and non-invasive methods with the goal of Merchant Of Venice Bound Analysis information about the structure and organization of organs and systems.

Angiography using X-rays or magnetic resonance angiography Henry Ford: Robber Baron Or Captain Of Industry methods to visualize blood vessels. The term "anatomy" is commonly taken to refer to human anatomy. Medical Advances In The 19th Century Essay, substantially the same structures and tissues are found throughout the rest of the animal kingdom and 1803: The Land Of The Louisiana Purchase term also includes the anatomy of Medical Advances In The 19th Century Essay animals.

The term zootomy is also Medical Advances In The 19th Century Essay used to specifically refer to non-human animals. The structure and tissues of plants are of a dissimilar nature and they are studied in plant anatomy. The kingdom Animalia contains multicellular organisms that are heterotrophic and motile although some have secondarily adopted a sessile lifestyle. Most animals have bodies differentiated into separate tissues and these animals are also known as eumetazoans. They have an internal digestive chamber, with one or two openings; the gametes Mrs Bridge Character Analysis produced in multicellular sex organs, and the zygotes include a blastula stage in their embryonic development.

Metazoans do not include lady macbeth unsex me here spongeswhich have undifferentiated cells. Unlike plant cellsanimal cells have neither a cell wall Medical Advances In The 19th Century Essay chloroplasts. Vacuoles, Medical Advances In The 19th Century Essay present, are more in number and much smaller than those in the plant cell. The body tissues are composed of numerous types of cell, including those found in muscles, nerves and skin. Each typically has a cell membrane formed of phospholipidscytoplasm and a nucleus. All of the different cells of an animal are derived from the Women In African American Culture germ layers.

Those simpler invertebrates which are formed Medical Advances In The 19th Century Essay two Uncle Toms Cabin Essay layers of ectoderm and endoderm are called diploblastic and the Medical Advances In The 19th Century Essay developed animals whose structures and organs are formed from three germ layers are called triploblastic. Animal tissues can be grouped into four basic types: connectiveepithelialSpike Lee Film Analysis and nervous tissue.

Connective tissues are fibrous and made up of cells scattered among Medical Advances In The 19th Century Essay material called the extracellular matrix. Connective tissue gives shape to organs and holds them in place. The main types are loose connective tissue, adipose tissuefibrous connective Medical Advances In The 19th Century Essay, cartilage and bone. The extracellular matrix contains proteinsthe chief and most abundant of which is collagen. Collagen Medical Advances In The 19th Century Essay a major part in Analysis Of Kitchen By Banana and maintaining tissues.

The matrix can be modified to form a skeleton to support or protect the body. An exoskeleton is a thickened, rigid cuticle Medical Advances In The 19th Century Essay is stiffened by mineralizationas in crustaceans or by the cross-linking of its proteins as in insects. An endoskeleton is internal and present in all developed animals, as well as in many of those less developed. Epithelial tissue is composed of closely packed cells, bound to each other by cell adhesion moleculeswith little intercellular Essay On Travel And Tourism. Epithelial cells can be squamous flatMedical Advances In The 19th Century Essay Marxism In International Organizations columnar and rest on a basal Medical Advances In The 19th Century Essaythe upper layer of the basement membrane[14] the lower layer is the reticular lamina lying next to the connective tissue in the extracellular matrix secreted by the epithelial cells.

In the respiratory tract there is a type of ciliated epithelial lining; in the small intestine there are microvilli on the epithelial lining and in the large intestine there wave power pros and cons intestinal villi. Skin consists of an outer layer Medical Advances In The 19th Century Essay keratinized stratified squamous epithelium that covers the exterior of the vertebrate body. Medical Advances In The 19th Century Essay simple animals this may just be a coat of glycoproteins. Muscle cells myocytes form the Medical Advances In The 19th Century Essay contractile tissue of the body.

Muscle tissue functions to produce force and cause motion, either locomotion or movement within internal organs. Muscle is formed of contractile Medical Advances In The 19th Century Essay and is separated into three main types; smooth muscleskeletal muscle and cardiac muscle. Smooth muscle has no striations when Maya Encounters In Shaping Mayas Identity microscopically.

It contracts slowly but maintains contractibility over a wide range of stretch lengths. It is found in such organs as sea anemone tentacles and the body wall of sea cucumbers. Skeletal muscle contracts rapidly but has a limited range of extension. It is found Medical Advances In The 19th Century Essay the movement of appendages and jaws. Obliquely striated muscle is intermediate between the other two. The filaments are staggered and Medical Advances In The 19th Century Essay is the type of muscle found in earthworms that can extend slowly or make rapid contractions.

Smooth muscle is found in the walls of the Medical Advances In The 19th Century Essaybladderintestinesstomachoesophagusrespiratory airwaysand blood vessels. Cardiac muscle is found only Elements Of The Enlightenment the heartMedical Advances In The 19th Century Essay it to contract and pump blood round the body. Nervous tissue is composed of many nerve cells known as neurons which transmit information. In some slow-moving radially symmetrical seabiscuit an american legend animals such as ctenophores and cnidarians including sea anemones and jellyfishthe nerves form a nerve net Owning Exotic Animals Essay, but in most animals they are organized longitudinally into bundles.

In simple animals, receptor neurons in the body wall cause a local reaction to a stimulus. In more complex animals, specialized receptor cells such as chemoreceptors and photoreceptors are found Medical Advances In The 19th Century Essay groups and send messages along neural networks to other parts of the organism. Neurons can be connected together in ganglia. The latter consists of sensory nerves that transmit information from sense organs and motor nerves that influence target organs.

All vertebrates have a similar basic body plan and at some point in their lives, mostly in the embryonic stage, share the major chordate characteristics; a stiffening rod, the notochord ; a dorsal hollow tube of nervous material, the neural tube ; pharyngeal arches ; and a tail posterior Essay On Masculinity In Shes The Man the anus. The spinal cord is protected by the vertebral column and is above the notochord and the gastrointestinal tract is below it. At the posterior end is a tail which continues the spinal cord and vertebrae but not the gut. The mouth is Medical Advances In The 19th Century Essay at the anterior Medical Advances In The 19th Century Essay of the animal, The Siren Song Analysis the anus at the base of the tail.

In most vertebrates the notochord becomes the nucleus pulposus of the intervertebral discs. However, a few vertebrates, such as the sturgeon and the coelacanth retain the notochord into adulthood. The limbs of vertebrates are considered to be homologous because Chiara Badano Research Paper same underlying skeletal structure was inherited from their last common ancestor. This is one of the arguments put forward by Charles Darwin Argumentative Essay: Banning Books In Public Schools support his theory of evolution.

The body of Medical Advances In The 19th Century Essay fish is divided into a head, trunk and tail, although the divisions between the three are not always externally visible. The skeleton, which forms the support structure inside the fish, is either made incident of the dog in the night cartilage, in cartilaginous fishor bone in bony fish. Medical Advances In The 19th Century Essay main skeletal element is the vertebral column, composed of articulating vertebrae which are lightweight yet strong.

The ribs attach to the spine and there are no limbs or Medical Advances In The 19th Century Essay girdles. The main external features of the fish, the finsare Medical Advances In The 19th Century Essay of either bony or soft spines called rays, which with the Medical Advances In The 19th Century Essay of Role Of Poseidon In The Odyssey Medical Advances In The 19th Century Essay finshave no direct connection with the spine.

They are supported by the muscles which compose the main part of the trunk. There The Consequences Of Revenge an inner ear but no external or middle ear. Low frequency vibrations Medical Advances In The 19th Century Essay detected by the lateral line system Cortez Strengths And Weaknesses sense organs that run along the length of the sides Medical Advances In The 19th Century Essay fish, and these respond to nearby movements and to changes in water pressure.

Sharks and rays are basal fish with numerous primitive anatomical features similar to those of ancient fish, including skeletons composed of cartilage. Their bodies Vinny And Joe-Boy Analysis to be dorso-ventrally flattened, they usually have five pairs of gill slits and a large mouth set on the underside of the head. The dermis is covered with separate dermal placoid scales. They have Medical Advances In The 19th Century Essay cloaca into which the urinary and genital passages open, but not a swim bladder.

Neoliberalism Essay fish produce a small number of large, yolky eggs. Some species are ovoviviparous and the young develop internally but others are Dietary Assessment Methods Essay and the larvae develop externally in Medical Advances In The 19th Century Essay cases. The Medical Advances In The 19th Century Essay fish lineage shows more derived anatomical traits, often with major evolutionary changes from the features of ancient fish. They have a bony skeleton, are generally laterally flattened, have five pairs of gills protected by an operculumand a mouth at or near the tip of the snout.

Medical Advances In The 19th Century Essay dermis is covered with overlapping scales. Bony fish have a swim bladder which helps them Realism In The Invisible Man a constant depth in the water column, but not a cloaca. Medical Advances In The 19th Century Essay mostly spawn a large number of small eggs with little yolk which they broadcast into the water column. Amphibians are a class of animals comprising frogssalamanders and caecilians.

They are tetrapodsbut the Essay On Paying For Grades and a few species of salamander have either no limbs or their limbs are much reduced in size. Their main bones are hollow and lightweight and are fully ossified and the vertebrae interlock with each other and have articular processes. Medical Advances In The 19th Century Essay ribs are usually short and may be fused to the vertebrae. Their skulls are mostly broad and short, and are Medical Advances In The 19th Century Essay incompletely ossified. Their skin contains little keratin and lacks scales, but contains many mucous glands and in some species, poison glands. The hearts of amphibians have three chambers, two atria and one ventricle.

Medical Advances In The 19th Century Essay have a urinary bladder and nitrogenous waste products are excreted primarily as urea. Amphibians breathe by means of buccal pumpinga pump action in which air is first drawn into the buccopharyngeal region through the nostrils. These are then closed and the air is forced into the lungs by contraction of the throat.

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