Q:

Which organelle is the site of cellular respiration?

A:

Quick Answer

The mitochondria of the eukaryotic cells are the sites of cellular respiration and where most of the steps take place. Cellular respiration allows for the release of energy stored in chemical bonds of glucose (obtained from food) to form adenosine triphosphate, which is the energy currency of the cell.

Know More

Full Answer

Cellular respiration occurs in multiple steps. Glucose is first broken down into smaller pyruvate molecules in the cytoplasm. After this step, if the cell does not have oxygen, the pyruvate is fermented in an anaerobic process to release lactate. In the presence of oxygen, aerobic respiration takes place in the mitochondria.

The pyruvate is transported to the mitochondria, where it first enters the tricarboxylic acid cycle, which is also known as Krebs cycle. Pyruvate is oxidized to acetyl CoA, which then enters the TCA cycle, resulting in the production of one ATP molecule and three NADH, or reduced nicotinamide dinucleotide, molecules. The TCA cycle is not a major source for ATP production.

The NADH produced is then cycled through the electron transport along the convoluted membranes of the mitochondria. The oxidation of NADH to NAD+ allows for ATP production. Most of the ATP produced during cellular respiration is produced during the electron transport phase.

Mitochondria are present in all living eukaryotic cells. Some cells, such as fat cells and muscle cells, may have more mitochondria because they either store energy or have a need to respond quickly to move and do work.

Learn more about Cells

Related Questions

  • Q:

    Why is cellular respiration important?

    A:

    Faculty resources from Thomas Nelson Community College explain that cellular respiration is the process by which cells produce adenosine triphosphate, or ATP. ATP is the molecule that carries energy for the cells of an organism, and it functions as a “currency” for the cells in an organism. Cells cannot store ATP; instead, they must produce it continuously or the organism will die.

    Full Answer >
    Filed Under:
  • Q:

    How Is Breathing Related to Cellular Respiration?

    A:

    Cellular respiration is directly related to breathing, as breathing provides the necessary oxygen molecules for the process of cellular respiration to take place; cellular respiration is a process by which cells acquire energy. The oxygen provided by breathing is used as a final hydrogen acceptor for the process, explains Antranik.org.

    Full Answer >
    Filed Under:
  • Q:

    What is released during cellular respiration?

    A:

    According to the State University of New York, the major products released during cellular respiration are carbon dioxide, water and energy in the form of ATP molecules. These are all generated in several steps in the progressive breakdown of glucose molecules through reactions with oxygen and other molecules.

    Full Answer >
    Filed Under:
  • Q:

    What happens during cellular respiration?

    A:

    During cellular respiration, glucose breaks down into carbon dioxide and water. This process releases a store of energy, or ATP, that cells can use for their needs.

    Full Answer >
    Filed Under:

Explore