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What Are Photosynthesis and Respiration?

Respiration occurs in your cells and is fueled by the oxygen you inhale. The carbon dioxide gas you exhale is the result of a completed cycle of cellular respiration.

 Neither you, nor the coeditors you shared it with will be able to recover it again.

The process revolves around catabolic reactions which facilitate oxidation of one molecule with the reduction of the other.

In a broad sense, cellular respiration can be classified into two types: aerobic and anaerobic.

This process though, is not as efficient as cellular respiration.

Cellular respiration occurs in both plants and animals cells while photosynthesis only occurs in plant cells. How are plants and animals connected via these two processes? Be sure to include balanced chemical equations as part of your answer.



Definition

Respiration, at the cellular level, is a set of connected metabolic processes that are directed towards converting stored biochemical energy in food, into ATP (Adenosine Triphosphate) molecules, which are the body's energy currency.

Euglena, Photosyntesis and Aerobic Respiration

The common oxidizing agent in this process is molecular oxygen.


That plants resort to cellular respiration may seem a little confusing, as we have always been told that they produce energy by resorting to photosynthesis.

Plants do resort to cellular respiration, wherein the products of photosynthesis are reunited to produce energy, which they have to do in order to convert the energy which is stored in the form of glucose into usable chemical energy.

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Cycle of Photosynthesis and Respiration - VTAide

In other words, electron transport chain triggers a gradient through which ATP is produced in a process known as chemiosmosis.

During photosynthesis, the plant utilizes the Sun's energy and stores it in the form of bonds of glucose molecules.

Cellular Respiration and Photosynthesis

NAD+ and FAD act like electron shuttle buses for the cell. The empty buses, NAD+ and FAD, drive up to oxidation reactions and collect electron passengers. When the electrons get on the bus, the driver puts up the H sign to show that the bus is full. Then the full buses, NADH and FADH2, drive over to reactions that need electrons and let the passengers off. The buses are now empty again, so they drive back to another oxidation reaction to collect new passengers. During cellular respiration, the electron shuttle buses drive a loop between the reactions of glycolysis and the Krebs cycle (where they pick up passengers) to the electron transport chain (where they drop off passengers).

What Are Photosynthesis and Respiration? - dummies

After the large molecules in food are broken down into their smaller subunits during digestion, the small molecules can be further broken down to transfer their energy to ATP. During cellular respiration, enzymes slowly rearrange the atoms in food molecules. Each rearrangement produces a new molecule in the pathway and can also produce other useful molecules for the cell. Some reactions

LabBench Activity Cell Respiration

Different kinds of food molecules enter cellular respiration at different points in the pathway. Cells break down simple sugars, such as glucose, in the first pathway — glycolysis. Cells use the second pathway, the Krebs cycle, for breaking down fatty acids and amino acids.

Cellular respiration occurs in most cells of both plants and animals

Through this process, green plants capture energy from the sun, use some of it to function and grow, and store some of it in their plant structure, where it’s available to other organisms when they eat the plants. At the same time, the plants release oxygen into the atmosphere.

Chemical Equation for Cellular Respiration - BiologyWise

Cellular respiration is also important in the movement of matter through living systems: As living things break down food molecules using cellular respiration, they release the atoms from the food molecules back out into the environment as carbon dioxide and water. Photosynthesis brings in carbon dioxide and water from the environment, and cellular respiration sends them out again, forming a circular matter pathway that scientists call the carbon cycle.

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