Adenosine Triphosphate (ATP)
ATP stands for Adenosine Triphosphate and is the immediate supply of energy for biological processes. The ATP consists of an organic nitrogenous base, Adenosine, which is one of the four bases found in a
DNA strand, it also consists of a ribose sugar with three phosphates joined by high energy bonds. The energy itself is stored in the form of high-energy chemical bonds; this energy is released on hydrolysis,
i.e. by the reaction with water, in a similar way peptide bonds are hydrolysed in proteins. ATP is adapted to is highly suited to its function and role within living organisms as it is easily broken down and is thus a store for immediate energy; it is also a small molecule and can easily move around cells and through membranes.
The production of ATP is usually associated with two principalities including respiration and mitochondria. It is common knowledge that respiration, which happens in all living organisms, produces energy and is expressed by the equation of:
Glucose + Oxygen Carbon Dioxide + Water + Energy
Respiration can be, aerobic, occurring in an oxygenated environment or anaerobic, occurring in oxygen lacking environments. The latter producing 2 molecules of ATP and the former producing between 36- 38
ATP molecules. The energy released from the respiration of glucose is used to add inorganic phosphate to ADP, producing ATP. This is achieved by glycolysis, krebs cycle and oxidative phosphorylation which are cumulatively known to be involved in aerobic cellular respiration. As we shall see, this process makes use of co-enzymes such as ADP and Dehydrogenases such as NAD+.
Glycolysis occurs in the cytoplasm of a cell and involves the production of 2 molecules of pyruvate which occurs when glucose undergoes phosphorylation, lysis and then oxidation, yielding pyruvate and 2 molecules of ATP along with 2 molecules of reduced NAD. In aerobic respiration only the reduced NAD generated here enters a mitochondrion and goes into the electron transport chair where it is used to generate 6 molecules of ATP. Hence, the net ATP produced from glycolysis are 8 molecules of ATP.
The next stage is krebs cycle which occurs in the matrix of the mitochondria, the resulting product from oxdative decarboxylation of pyruvate is progressively degraded by as series of reactions involving four dehydrogenations, two decarboxylations and ...
... middle of paper ...
...P the hexose would not be formed and none of the compounds would be produced, thus the plant would not exist.
ATP is used in active transport in plants, similar to the kidney in humans. The absorption of minerals, such as nitrates & phosphates require ATP, which are present in root hair cells. These nitrates and phosphates are used in protein and chlorophyll synthesis as well as synthesis of DNA, ATP and NADP, which are essential to the plants growth. However, the mineral salts which are carried in solution by the symplast or apoplast pathway need to cross the endodermal barrier, which is impermeable. They cross the endodermal barrier by active transport and continue their journey in solution as ions in the xylem.
In conclusion, ATP is adapted to its function and is probably one of the most important molecules in biological processes; it is produced in the mitochondria but is used all over the human body and is equally important in plants, where it is produced in the thylakoids. ATP is essential for survival as it allows the growth of autotrophs and thus supports all the food chains in the world, and also is important in maintaining and controlling the human internal environment.
The ATP is used for many cell functions including transport work moving substances across cell membranes. It is also used for mechanical work, supplying the energy needed for muscle contraction. It supplies energy not only to heart muscle (for blood circulation) and skeletal muscle (such as for gross body movement), but also to the chromosomes and flagella to enable them to carry out their many functions. A major role of ATP is in chemical work, supplying the needed energy to synthesize the multi-thousands of types of macromolecules that the cell needs to exist. ATP is also used as an on-off switch both to control chemical reactions and to send messages.
The mind which is a non-extended thing, thinking is very different from the body which is a non-thinking thing, an extended and therefore Descartes argues that it is possible for the body to function without the mind and the mind to function without the body (Sorabji, 72). In Descartes theory of mind-body dualism, there exist several theories. Descartes describes the real distinction as the distinction between two things or substances. A substance is something that does not require any other creature to exist since it can occur with God’s concurrence only. Mode, on the other hand, is the affection towards a particular substance. Descartes argues that there are two payoffs for arguing that the mind and body can exist without each other. This includes the religious motivation and provides hope for the immortality of the soul and the second one is the scientific motivation that paves way for the new version of Descartes mechanistic
Rene Descartes uses the Skeptical method to re-examine everything he knows and form concrete beliefs in the process. In some of his meditations he touches on the body verses mind dichotomy. First, the “body” and “mind/soul” need to be differentiated. Rene Descartes and Simon Blackburn lace definitions of these two entities through their writings. In his second meditation Descartes briefly discusses the difference between the mind and body. Descartes notes that he pulled this thought from his old, misguided days, but it is still useful for defining these two terms, as it gets the essence of difference between them. He writes, “I had a face, hands, arms, and the whole structure of bodily parts that corpses have – I call it the body. The next belief was that I ate and drank, that I moved about, and that I engaged in sense perception and thinking; these things, I thought, were done by the soul” (4). Basically, the main activity of the body is movement and sustenance, while the mind is used for sensing and thinking. Blackburn calls him a substance dualist. He further explains this distinction in discussion Descartes dualism, “thoughts and experiences ate modifications in one kind of stuff; movement and position belongs to the other” (51). The body’s basic function is movement and the mind’s basic function is sensing – one is tangible, while the other is
Outline and assess Descartes' arguments for the conclusion that mind and body are distinct substances.
In conjunction with this theory, any matter is known through the mind. This reasoning was used as a basis toward the dualism of the mind and body. The mind is a thinking entity. It has the ability to imagine, dream, and ultimately encompass the aspects that are not fundamentally matter. The body exists outside the mind. It is the connection to the external world based on the scientific properties of mass, size, shape, and motion. Descartes argues that the mind is distinct from the body. The mind thinks and does not have scientific properties. One’s body is a non-thinking thing. This distinction leads Descartes to conclude that the mind is not the same as the body. There is no characteristic that is categorized as both mind and body; the body can be changed, the mind cannot. In continuation, the mind can exist without the body and the body can exist without the mind since each thing is distinct. Descartes later explains how the brain is not the same as the mind. The brain is the connection between the mind and body in a human being. Descartes argues that matter cannot be the same as anything mental. The mind is affected by the brain, providing one with insight into the external world. Also, the mind can influence the brain, hence one’s body being controlled by the mind. However, it is possible for the brain to cease functionally and the mind to still operate. Essentially, one can conclude that the
Therefore, it is clear that Descartes does not give a satisfactory answer to Elizabeth regarding the union between the body and the soul. In this regard, it is understandable why Elizabeth gets upset when she fails to get the answer she needed. Ultimately, the question is not answered and Descartes advises Elizabeth not to pay much attention to the meditation in order to explain the union of the body and soul. Instead, she should think of the union as an independent phenomenon.
The human body is made of cells, which means that if the cells die, the human dies. Metabolism keeps the cells and thus the body alive and functioning properly and can be divided into two parts: catabolism and anabolism. Catabolism breaks down molecules in order to gain energy while anabolism synthesizes everything that the cells need.
In arguing for the distinction between mind and body, Descartes seeks to show that the two are independent substances and can exist separately. It will be useful to outline Descartes’ argument based on clear and distinct perception by listing his premises and conclusion. The essay will then analyse each premise in turn, arguing that the argument fails because his premises are faulty. The argument, found in the Sixth Meditation, runs as follows
Therefore, in Meditation two in Meditations on First Philosophy, Descartes proves to show the distinction between the mind and that of the body. Descartes knows without a doubt that he is a thinking thing who has certain powers such as affirming, denying, sensing, imagining etc. The example that he provided with the piece of wax showed how we could misjudge and come to error when perceiving a thing. Descartes is able to prove that he exists in the same way that he judged the existence of the wax and how he saw it. Most importantly, Descartes comes to the conclusion that the intellect of the mind is what helps distinct and perceive something, rather than other factors.
Fermentation is an anaerobic process in which fuel molecules are broken down to create pyruvate and ATP molecules (Alberts, 1998). Both pyruvate and ATP are major energy sources used by the cell to do a variety of things. For example, ATP is used in cell division to divide the chromosomes (Alberts, 1998).
What is the mind-body problem? The mind-body problem is the main question of trying to distinguish between the qualities of the mental and physical (Schulz & Schulz, 2016). Many scholars seemed to always argue about the mind and body as to whether they were separate or essentially the same thing. Descartes decided to tackle this question head on and he came up with some interesting answers to
DiPiero, Thomas. "University of Rochester." Rochester Review ::. N.p., Oct. 2010. Web. 13 Apr. 2014.
Cesare Beccaria, a seventeenth century theologian developed the classical theory in 1764 (Cesare Beccaria , 2014). He published an anonymous essay titled On Crimes and Punishment. In the essay, he wrote about criminal justice and ways to make the justice
TutorVista.com (2015), states that; “photosynthesis and cellular respiration are metabolic reactions that complete each other in the environment. They are the same reactions but occur in reverse. In photosynthesis, carbon dioxide and water yield glucose and oxygen respiration, process glucose and oxygen yield carbon dioxide and water, catabolic pathway process which requires or contains molecular oxygen for the production of adenosine triphosphate. This three step aerobic respiration cycle occurs in the cytoplasm and in the organelles called mitochondria. Within this process, cells break down oxygen and glucose in its storable form called adenosine triphosphate or ATP. This cellular respiration or sometimes called an exothermic reaction is similar to a combustion type reaction whereby the cell releases energy in the form heat but at a much slower rate within a living cell. According to our text, Campbell Essential Biology with Physiology, (2010, pg. 94), cellular respiration is stated as “The aerobic harvesting of energy from food molecules; the energy-releasing chemical breakdown of food molecules, such as glucose, and the storage of potential energy in a form that cells can use to perform work; involves glycolysis, the citric acid cycle, the electron transport chain, and chemiosmosis”. It is also my understanding that it is possible for cellular respiration to take place without oxygen, which is called anaerobic respiration. In the anaerobic respiration process the glycosis step or sometimes referred to as the metabolic pathway process deferrers because the anaerobic condition produces
Enzymes Enzymes are the sparks that start the essential chemical reactions our bodies need to live. They are necessary for digesting food, for stimulating the brain, for providing cellular energy, and for repairing all tissues, organs, and cells. There are three types of enzymes: metabolic enzymes, digestive enzymes, and food enzymes. Metabolic enzymes catalyse, or spark, the reactions within the cells. The body's organs, tissues and cells are run by metabolic enzymes.