Cell Organelles-Function

Cells are the functional and structural units of the body that are found in all living things. Cells are composed of protoplasm. It is joined via cell membranes or plasma membranes and has a nucleus. The nucleus and cytoplasm make up protoplasm, which is one of the important components of the cell. Mitochondria, Golgi bodies, endoplasmic reticulum, ribosomes, Lysosomes and plastids are all organelles located within the cytoplasm of the cells.

Cell organelles-function

Plasma membrane

1. The plasma membrane encloses the cell contents. It protects the integrity of the inner cell.
2. Supporting and maintaining the cell’s shape.
3. It gives cells their shape, like the red blood cells’ characteristic shape and bone cells.
4. This helps regulate cell growth by balancing endocytosis with exocytosis.
5. Cell membranes play an important role in cell communication and signaling.
6. It allows only certain substances to enter the cell as a selectively permeable barrier.

Endoplasmic Reticulum

• The function of the endoplasmic retina is to provide an inner framework, compartment, and reaction surfaces

• It also transports enzymes and other materials through the cell
• The rough endoplasmic retina is home to ribosomes responsible for protein synthesis

• The site of steroid synthesis and storage of carbohydrates is the smooth endoplasmic retinaculum

Plastids

There are various kinds of plastids, each with its specific tasks. A few are categorized according to whether or not they have biological pigments and the stages they go through in development.

Chloroplasts

• Chloroplasts are biconvex in shape semi-porous, a double membrane, cell organelle found in the mesophyll of the cell of the plant

• They are the places to synthesize food via using photosynthesis

Chromoplasts

• Chromoplasts refers to a specialty where all pigments need to be synthesized and stored within the plant

• They can be found in flowering plants and slightly older leaves and fruits

• Chloroplasts are converted into Chromoplasts

• Chromoplasts are a source of carotenoid pigments

• They provide several colors that are noticeable in the fruit and leaves

• The primary reason for the distinguishing color is to attract pollinators

Gerontoplasts

• These are chloroplasts, which belong to the aging process

• Geronoplasts refer to the chloroplasts in leaves that aid in converting into a variety of organelles once the leaf stops producing photosynthesis normally in the autumnal month

Leucoplasts

• Found in the organelles that are not pigmented, that are colorless

• Leucoplasts are generally found in most non-photosynthetic components of plants, such as the roots

• They serve as a storage area for carbohydrates, proteins and lipids, depending on the plant’s needs

• They are used to convert amino acids and fatty acids

• Leucoplasts: It can be classified into three kinds:-

• Amyloplasts: Amyloplasts are the most effective of all three, and they synthesize and store carbohydrates

• Proteinoplasts: Proteinoplasts assist in storing proteins that plants require and are usually present in the seeds

• Elaioplasts: Elaioplasts assist in storing fats and oils, which plants require

Ribosomes

1. Ribosomes are the sites wherein proteins are synthesized.
2. Ribosomes in the cells undergo the process of combining amino acids to produce proteins. These proteins are involved in a variety of biological processes.
3. t-RNA (transfer Ribonucleic acid) is formed when the ribosomal unit contains mRNA (Messenger Ribonucleic acid) during protein synthesis.
4. They take part in DNA (Deoxyribonucleic acid) transcription, which converts DNA (Deoxyribonucleic acid) into mRNA (Messenger Ribonucleic acid). The free ribosomes participate in the synthesis of protein in the cytoplasm. The cytoplasm uses it. However, the protein synthesis, which takes place by the ribosomes found attached to the rough ribosome, is transported outside the cell.
5. In the cytoplasm, free ribosomes are involved in protein synthesis. The cytoplasm makes use of it. Protein synthesis is carried out by ribosomes linked to the rough ribosome outside the cell.

Golgi apparatus:

1. The Golgi apparatus receives most of the transport vesicles that exit the endoplasmic reticulum. Endoplasmic reticulum vesicles integrate with the cis face of the Golgi apparatus and migrate to the maturing face. As a result, the Golgi apparatus functions as a warehouse where chemicals like glycoproteins and glycolipids are synthesized, collected from some other cell organelles, sorted, and delivered to other destinations.
2. The endoplasmic reticulum’s secreted substances are modified in the Golgi apparatus before being sent to the appropriate destinations. The sugars are added to proteins to structure glycoproteins, and the first amino acid methionine is withdrawn from recently created proteins to create a functional protein.
3. Sugars are converted into cell wall components by enzymes in the Golgi body in plants.
4. Lysosomes are also made from Golgi vesicles.

Microbodies

Lysosome Functions

1. 1. 1. They possess hydrolytic enzymes, which degrade biomolecules by several eukaryotic cells.
      2. Lysosomes contain hydrolytic enzymes used by cells to conduct intracellular molecules digestion in several situations.
      3. Lysosomes are used by some single-celled organisms, such as amoeba, to digest the ingested food in the vacuole.
      4. In an acidic environment, these enzymes perform optimally. Because the cytosol pH is neutral, the enzyme would not harm the cell or its organelles if the lysosome membrane cracks and the contents flow out. Excessive leakage from a high number of lysosomes, on the other hand, can cause a cell to self-destruct due to digestion.
      5. With the help of their hydrolyzing enzymes, lysosomes decompose undesirable components, such as decrepit organelles or even complete cells.
      6. White blood cells use lysosomes to decompose microorganisms.
      7. By permitting sperm to penetrate the ovum, they aid in fertilization. The sperm head contains the acrosome, a lysosome that digests the ovum’s top layer before entering it.
      8. Phagocytosis is also carried out by some human cells. Macrophages, immune system cells that allow the body to protect itself by engulfing and eliminating bacteria and other pathogens, were amongst them.

Peroxisomes Function

1. There are enzymes present in the peroxisomes that oxidize the long-chain fatty acids.
2. Using their enzyme, they participate in the synthesis of cholesterol.
3. They are involved in detoxifying substances such as ethanol and hydrogen peroxide, which are harmful to the body cells.
4. Some of its enzymes, called peroxisomal enzymes, initiate plasmalogen synthesis. This substance is the major phospholipid component of myelin.
5. Plant cells also use it in photorespiration.

Glyoxysomes  functions

1. Present in yeast cells and some fungi, and the seeds of plants, which are rich in fat.
2. They synthesize carbohydrates from the stored fat to provide the required energy to the seed during germination using its fatty acid metabolism enzymes. This is important because, at this stage, they are not able to synthesize their carbohydrate as they lack photosynthesis.

Cytoskeleton

1. The cell’s cytoskeleton is a part of the motor proteins and assists in cell mobility. Cell motility is used to describe changes in the location of cells and the movement of cells’ parts.
2. Endocytosis and exocytosis are made easier by the cytoskeleton.
3. Microtubules organize into the mitotic spindle during mitosis to guarantee that chromosomes are distributed correctly to daughter cells.
4. Microtubules help macromolecules move around.
5. To facilitate mobility, microtubules aid in creating cilia and flagella, which are cell appendages.
6. These filaments hold the various organelles of the cell at an exact position inside cells.
7. These filaments aid in helping cells to maintain their shape.
8. These filaments aid in forming the nuclear lamina that is inside the nucleus envelope.
9. Actin filaments in thousands and thicker filaments made from myosin protein interact to induce contracting of muscles cells.
10. In the protist unicellular amoeba as well as some White blood cells in our bodies, localized contractions triggered by myosin and actin are incorporated into the amoeboid cell movement, including extensive pseudopodia.
11. The actin-protein interactions enable the cytoplasmic stream. The term “cytoplasmic streaming” refers to an encircling movement of cytoplasm within cells, which allows for greater mobility of the various cells.

Cilia

1. Cilia are used by some unicellular organisms, such as Paramecium, to swim in the water.
2. Some biological tissues in multicellular organisms, such as epithelial tissues, have cilia.
3. The current in the fluid is produced by beating in the fluid that enables it to travel in a specific direction, such as pushing mucus and dust particles out of the windpipe or trachea.
4. Cilia beat like a boat’s little oars or pedals.

Flagella

1. Flagella are used by some unicellular organisms, such as Euglena, to swim in the water.
2. They assist microorganism relocation.
3. They are sensing units to identify changes in pH and also temperature.
4. Just a few eukaryotes use flagellum to increase the rate of reproduction.
5. Current research studies have revealed flagella also serve as organelles for secretion. For example. Chlamydomonas.

Centriole

1. Centrioles play a role in cell division by orienting the mitotic spindle,’ which emerges during cell division.
2. Centrioles also form basal bodies. The axonemes of cilia and flagella are formed from these basal structures.
3. They aid in the cellular arrangement of microtubules.
4. Centrioles maintain the centrosome’s organization.

Vacuole

1. The primary vacuole serves as a storage area for many components such as water, minerals, proteins, vitamins, and pigments. A vacuole’s remaining space is filled with cell sap.
2. They serve as the primary storage location for mineral ions in plant cells.
3. The vacuole aids in cell pH management by supplying mineral ions to the cytoplasm when it is required to maintain the cell’s normal pH.
4. The vacuoles also contain several lipids.
5. The cell’s turgor pressure is also caused by the vacuole’s volume exerting tension on the cell wall. As a result, it helps the cells maintain their regular form. This enables it to survive harsh circumstances.
6. The mechanism through which the vacuole takes in substances is called endocytosis, while the process by which the vacuole excretes things is called exocytosis. The vacuole is where these chemicals are processed. As a result, it aids in the regulation of various components within the cells.

Mitochondria

1. The mitochondria play a vital role in the metabolic process of the cell.
2. Aerobic respiration takes place in mitochondria.
3. The mitochondria’s major role is to make and conserve energy in ATP (Adenosine Triphosphate), which is then released as needed.
4. Pyruvic acid is oxidized, the breakdown product of glucose to liberate energy, which is stored in the form of ATP (Adenosine Triphosphate) for later use, is done by the mitochondria. Cellular respiration is another name for this process. They use ATP (Adenosine Triphosphate) to generate cellular energy. As a result, they are known as the cell’s “powerhouses.”
5. They also execute various other functions, such as dehydrogenation, oxidative phosphorylation, and electron transport, which are made possible by the presence of certain enzymes on membranes and their structural arrangement.
6. The mitochondria play an important role in encouraging the formation of new cells and the replication of existing ones.
7. The high concentration of ammonia in liver cells can be dangerous. The mitochondria help in the detoxification process.
8. Some blood components and hormones are formed with the help of mitochondria. E.g., oestrogen, and testosterone.
9. It is important to maintain adequate calcium concentration in the cell. It is ensured with the help of mitochondria.
10. Certain cellular processes like cell signaling, cellular differentiation, division control, and cell growth are ensured with the help of mitochondria.
11. They also have ribosomes; therefore, they’re assumed to be capable of protein synthesis.
12. Only the mother’s mitochondria, and thus mitochondrial DNA, are inherited.

Nucleus

1. It is in charge of regulating an individual’s hereditary features.
2. It is in charge of protein synthesis, cell division, and differentiation.
3. The nucleolus stores genetic material in the form of DNA strands and RNA, and proteins.
4. It is a section dedicated to the transcription process, which results in the production of mRNA, which is then used to make proteins.
5. It aids in transferring RNA and DNA from the cell to the nucleus.
6. Ribosomes, often known as protein factories, are produced by the nucleolus.
7. It is in charge of maintaining the integrity of gene expression and genes.
8. It maintains the cell’s functionality.
9. This organelle coordinates other cell organelles’ activities.
10. It takes care of the repairs.
11. Directly participates in cell division, resulting in genetically identical daughter cells. Mitotic cell division is the name for this process.
12. A different type of cell division known as meiotic cell division contributes to the creation of meio-gametes and meiospores.