An overview of the cellular transport and the osmosis

There are several different types of this easy movement of molecules. It could be as simple as molecules moving freely such as osmosis or diffusion. You may also see proteins in the cell membrane that act as channels to help the movement along. And of course there is an in-between transport process where very small molecules are able to cross a semi-permeable membrane.

An overview of the cellular transport and the osmosis

References What is Cellular Respiration? Living organisms, including plantsanimalsand microorganismsgenerate their own energy in a process called Cellular Respiration.

Interestingly depending on the type of precursor for ATP production, organisms can be classified into two: Why is Cellular Respiration Important?

As alluded to earlier, cellular respiration regardless whether it is aerobic or anaerobic provides the required amount of ATP for living organisms. The energy present in the form of ATP can then be utilized to drive various intra-cellular physiological processes like the transport of molecules across cell membranes and the synthesis of bio-molecules.

Wikimedia Aerobic respiration is the type of cellular respiration that requires the presence of oxygen. Among all the types of cellular respiration it is the most efficient. Plants and animals carry out this kind of respiration; plants obtain the precursor molecules from photosynthesis while animals obtain them from the food they eat i.

Photosynthesis Equation The equation for photosynthesis of plant cells is: Hence, the locations where occur in the cell vary from pathway to pathway.

Its overall chemical reaction of cellular respiration equation is simplified as: May range from 34 to 38 net ATP. The above cellular respiration formula is formulated by combining the three following processes into a single one. Such processes are explained below.

Stages of Cellular Respiration 1. Slide Share The first metabolic pathway during cellular respiration is glycolysis. As shown in the above diagram, glycolysis takes place in the cytosol. However, two molecules are consumed during the preparatory phase, hence, resulting to a net of just two ATP molecules.

Such reaction is the oxidative decarboxylation of pyruvate by the Pyruvate dehydrogenase complex PDC. In simpler terms, the pyruvate from glycolysis is oxidized converted to acetyl coA, one molecule of NADH nicotinamide adenine dinucleotideand one molecule of carbon dioxide.

The Krebs cycle, which occurs in the matrix of the mitochondrion, includes a series of oxidation-reduction reactions that result in the oxidation of the acetyl group to two carbon dioxide molecules.

An overview of the cellular transport and the osmosis

Note that the goal of the Krebs cycle is to generate high energy electrons from carbon sources. Also notice that the process itself does not generate huge amounts of ATP and does not use oxygen as a precursor molecule. Wikimedia The final pathway in the cellular respiration PDF is comprised of the electron transport chain and oxidative phosphorylation which both occur in the inner membrane of the mitochondrion.

This former, which is a part of the latter, establishes the chemiosmotic gradient proton gradient across the inner membrane of the mitochondrion by oxidizing the NADH from the Krebs cycle whereas the latter manages the pathway in which the electrons from the donors are transferred to the acceptors in redox reactions.

In ETC, electrons are transferred from one complex to next where the electrons reduce oxygen to produce water. - IB Biology Review Notes - Topic 1 - Cells

Such reactions produce the majority of ATP during cellular respiration. In total, the resulting product of aerobic cellular respiration from a single glucose molecule can be up to 38 ATP.

However, some organisms can only produce 34 to 36 because they have a different precursor molecule. What is the role of Oxygen in the process?

Oxygen is an essential molecule in cellular respiration. But where does it exactly fit in the picture? Basically, oxygen can be found at the end of the ETC during aerobic respiration where it accepts electrons while picking up protons in order to produce water molecules. When oxygen levels are depleted, electrons will be simply dispersed and the electron transport chain will discontinue.

Of course no ATP will be produced, causing the cease of some physiological functions in the cell. Fermentation Lactic Acid Fermentation Source: Wikimedia Alternatively during a depletion of oxygen, the cell may undergo a process called fermentation and utilize an alternative pathway at the end of glycolysis.

And instead of oxidative phosphorylation, it uses substrate level phosphorylation that does not require oxygen in the process this is not to be confused with anaerobic respiration. In animal cells, this process is called the lactic acid fermentation.

It is almost the same with aerobic respiration except that it produces lactic acid in the process. It can be simplified in the equation: Such process is referred to as the ethanol or alcohol fermentation.

Anaerobic Respiration Anaeribic Respiration Source: Wikimedia This process occurs just like the typical cellular reaction same glycolytic and Krebs cycle pathway but only differs because it is used by organisms like bacteria and archaea where oxygen is not the final electron acceptor.Osmosis - the diffusion of water (across a membrane) Water will move in the direction where there is a high concentration of solute (and hence a lower concentration of water.

A simple rule to remember is: Salt is a solute, when it is concentrated inside or outside the cell, it will draw the water in its direction.

Osmosis, Diffusion and Cell Transport. Types of Transport There are 3 types of transport in cells: 1. Osmosis is the diffusion of water from an area of high concentration to an area of low concentration across a membrane.

Cell membranes are completely permeable. Overview. The contractile vacuole is a specialized type of vacuole that regulates the quantity of water inside a freshwater environments, the concentration of solutes is hypotonic, higher inside than outside the these conditions, water osmosis causes water to accumulate in the cell from the external environment.

The contractile vacuole acts as part of a protective mechanism. Cell Membrane & Transport Overview Chapter Exam Instructions. Choose your answers to the questions and click 'Next' to see the next set of questions.

Metabolism (/ m ə ˈ t æ b ə l ɪ z ə m /, from Greek: μεταβολή metabolē, "change") is the set of life-sustaining chemical reactions in three main purposes of metabolism are the conversion of food/fuel to energy to run cellular processes, the conversion of food/fuel to building blocks for proteins, lipids, nucleic acids, and some carbohydrates, and the elimination of.

Apr 03,  · Hemochromatosis is the abnormal accumulation of iron in parenchymal organs, leading to organ toxicity. This is the most common inherited liver disease in white persons and the most common autosomal recessive genetic disorder. Cell Function: Passive Transport