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Free Essays - Biology Essays

Welcome to the free biology essays section. Here you will find a large collection of free biology essays which have been submitted to us by our student friends for publishing, with their permission, to help you with your own biology essays. Please remember to use these free essays as research material and reference them if you use any quotes.

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  • Biology Essays: Physical Workout - During a physical workout ones physical appearance is flushed red, warm to the touch, and perspiration is usually all over and give the person a shiny tint. All of these are healthy reactions unlike the man who has cool, clammy, moist skin with beads of perspiration. The body has to work hard along with the heart during exercise, there is more blood pumped through the body with every beat and is continuously working at its maximum level. Read this complete biology essay...
  • Biology Essays: Tendon Reflex - The clinical relevance of the tendon reflex, particularly the Patellar and Achilles tendon, is based on the ability to evaluate the functional disturbance for nominal or augmented reflex arc and the assessment for the motor system. The tendon reflex is useful for the assessment of several neurological/neuromuscular disorders. The experimental significance of the tendon reflex response is its respective sensitivity for inhibiting and facilitating influences. Read this complete biology essay...
  • Biology Essays: Psychophysical Phenomenon called Masking - Many studies of human pattern vision have concerned a psychophysical phenomenon called masking. In general, masking commonly refers to the “…interference among transient stimuli that are closely coupled in space or time” (Legge & Foley, 1980). In a masking paradigm, this means that when one stimulus (the mask) interferes with the detectability of another stimulus (the test), masking, or suppression, is said to occur (Meese & Hess, 2005). Read this complete biology essay...
  • Biology Essays: Filoviridae - The virus family Filoviridae is comprised of the Marburg virus and the four strains of the Ebola virus: Zaire, Sudan, Reston, and Ivory Coast. Of the four Ebola viruses, the Reston strain is the only one that does not cause disease in humans. A definitive reservoir for the viruses has not been fully determined, though Marburg virus was recently found in fruit bats. Death rates for Marburg and Ebola Zaire can be as high as 90%. Read this complete biology essay...
  • Biology Essays: Poxviridae - Unlike most viruses, members of Poxviridae replicate in the cytoplasm of the cell rather than the nucleus. When the virion first enters the cell via fusion with the plasma membrane, the outer proteins and lipid envelope uncoat from the virion. Then transcriptional enzymes carried in the core of the virion begin early gene expression. These early transcripts leave the core via microtubules and enter the cytoplasm to be translated by host ribosomes. Read this complete biology essay...
  • Biology Essays: Heart Disease - Coronary heart disease is a blanket term which describes all types of heart disease caused by blockage of the arteries that supply blood to the heart. Lack of sufficient blood is associated with a lack of oxygen, also called ischemia. Hence coronary heart disease is also called ischemic heart disease. Angina, heart attack and heart failure and are all clinical forms of coronary heart disease. The heart is a vital organ, pumping blood which carries essential oxygen and nutrients all around the body. Read this complete biology essay...
  • Biology Essays: Artificial Kidney - The human kidney is an amazing organ.  This small fist sized mass of tissues and veins is the body’s main defense against liquid-based pathogens.  The kidney works as a type of seining system to actually draw toxins out of the blood and then distribute them to a storage container for excretion from the body.  The filtration system may seem perfect at first glance, but there are a few problems that can arise depending on the living conditions and family history of the individual. Read this complete biology essay...
  • Biology Essays: QRS Complex & ECG - The first cardiac sounds are caused by the closure of the Mitral and Tricuspid valves at the onset of systole so this will be slightly after the QRS complex is seem on the ECG. The second set of sounds, due to the closure of the Aortic and Pulmonary valves, is heard after systole when the intra-aortic pressure starts to exceed the falling intra-ventricular pressure, and the blood tries to flow back into the ventricle. Read this complete biology essay...
  • Biology Essays: VHF Viruses - An outbreak of Ebola virus in Zaire in May 1995 first focused international attention on the group of diseases known collectively as viral hemorrhagic fevers (VHFs) (Tolan, 2004). These fever and bleeding disorders affect multiple organ systems, with severity varying widely from comparatively mild illness to fatal disease (Centers for Disease Control and Prevention (CDC), 2004). Read this complete biology essay...
  • Biology Essays: Ubiquitin Proteasome System - The ubiquitin-proteasome system is an incompletely understood and extremely complex intracellular pathway which is primarily concerned with the degradation of cellular proteins - usually prior to recycling and reconstruction of the protein sub-units. In the last two decades of the last century, the elements of the system were unravelled and, as a result, we now understand a great deal more about the way that proteins are managed within the cell. Read this complete biology essay...
  • Biology Essays: Dynamic Cardiomyoplasty - The aim of this literature project is to show that even though dynamic cardiomyoplasty is a promising treatment for heart failure, it is by no means without flaws, these must be addressed before it is to be fully trusted clinically. Although chronic low-frequency stimulation of the latissimus dorsi muscle leads to transdifferentiation into cardiac muscle, reports have shown that in the long term the transformed muscle fatigues, deteriorates and becomes infiltrated with fat. Read this complete biology essay...
  • Biology Essays: Stem Cells - Stem cells, under the right conditions, have the ability to differentiate into many specialised cell types. They can give rise to cardiomyocytes, nerve cells, adipocytes and osteocytes. The most researched stem cell is the adult stem cell, but these cells, except in the treatment of leukaemia, do not often lead to true transdifferentation when used clinically. Much research is still to needed to prove their efficacy in treating other diseases, including heart defects for example. Read this complete biology essay...
  • Biology Essays: Retroviruses - The history of retroviruses has been shaped by five distinct parameters. Since the discovery that sarcoma could be transmitted among chickens in the early part of the 20th century, the scientific world has also seen the development of the Focus assay and the discoveries of reverse transcriptase, retroviral oncogenes, and the first human retrovirus. It all began in 1910 with Peyton Rous’ observation that a spindle-cell sarcoma tumor isolated from a chicken. Read this complete biology essay...
  • Biology Essays: Central Nervous System - Central nervous system (CNS) is composed of brain and the spinal cord. Neurons constitute a major part of the developing CNS. An axon is an extension of a neuron. The brain grows as a swelling at the front (rostal) end of the neural tube and later leads to become a spinal cord (1,2). Development of the CNS involves many complex mechanisms beginning at the onset of transformation of a single layer of ectodermal cells. Read this complete biology essay...

All of the essays in the "Free Essays" section were written by students and then submitted to us to display and help others. Thanks to all the students who have submitted their essays to us. You should not hand in our essays as your own. We do not condone plagiarism!