Damn Near Everything There Is To Know About Cells:
Biology Cell Report
There are many parts of a cell, they all have specific duties, and are all needed to continue the life of the cell. Some cells exist as single-celled organisms that perform all of the organism's metabolism within a single cell.
Such single-celled organisms are called unicellular. Other organisms are made up of many cells, with their cells specialized to perform distinct metabolic functions. One cell within an organism may be adapted for movement, while another cell carries out digestion. The individual cells no longer carry out all life functions, but rather depend on each other. Many-celled organisms are called multicellular. When a group of cells function together to perform an activity, they form a tissue. The cells of a human are organized into tissues such as muscle and nerve tissues. Plant tissues include those of the stem and root. Many cells in tissues are linked to each other at contact sites called cell junctions. Cell junctions help maintain differences in the internal environment between adjacent cells, help anchor cells together, and allow cells to communicate with one another by passing small molecules from one cell to another. Groups of two or more tissues that function together make up organs. An organ system is a group of organs that work together to carry out major life functions.
Eukariotic Cell Structure:
Boundaries and Control:
Plasma Membrane - The plasma membrane is sometimes called the cell membrane, or the cellular membrane. It is the outermost part of the animal cell, and it's purpose is to enclose the cell, and change shape if needed. The cell membrane is capable of allowing materials to enter and exit the cell. Oxygen and nutrients enter, and waste products such as excess water leave. The plasma membrane helps maintain a chemical balance within the cell.
Cell wall - The cell wall is an added boundary to the cell. It is relatively inflexible, and surrounds the plasma membrane. The cell wall is much thinker than the plasma membrane and is made of different substances in different organisms. The cells of plants, fungi, almost all bacteria, and some protists have cell walls. Animal cells have no cell walls. Plant cells contain cellulose molecules, which form fibers. This fibrous cellulose of plants provides the bulk of the fiber in our diets. Chitin, a nitr...
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... pigments, molecules that give color.
Structures for Support and Locomotion:
The cytoskeleton is a network of thin, fibrous elements that act as a sort of scaffold to provide support for organelles. It also helps maintain cell shape in a manner similar to the way poles maintain the shape of a tent. The cytoskeleton is usually composed of microtubules and microfilaments.
Microtubules are thin, hollow cylinders made of protein. Microfilaments are thin, solid protein fibers. Microtubules and microfilaments make up most of the sytoskeleton. Cilia - Cilia are only contained in some cells. They are short, numerous, hairlike projections out of the plasma membrane. Cilia tend to occur in large numbers on a cell's surface, and their beating activity is usually coordinated.
Flagella - Flagella are longer projections that move with a whiplike motion.
Cells that have flagella only have one or two per cell. In single-celled organisms, cilia and flagella are the major means of locomotion. Sperm cells of animals and some plants move by means of flagella. Organisms that contain many cells, including humans, have cilia that move fluids over a cell's surface, rather than moving the cell itself.
The building of the grocery store is like the cell membrane, because it gives it structure and keeps everything inside safe. The security guard of the front door in the grocery store is like the cell membrane, because it says what can come in and out of the cell. The boss of the store is like the nucleus, because they tell the employes what to do and what needs to be done. The floors of the grocery store is like the cytoplasm, because it hold everything in it place, where it need to be. The illes in the store is
Charles Darwin once compared the root tips of plants to “the brain of one of the lower animals” he even reported electrical signal systems in plants, much like a nervous system. More than a century after Darwin, a scientist named Mancuso discovered the center for the electrical signals, or action potentials, is located in the root tips. Even small plants had nearly 14 million root tips, all acting in a similar way to a nervous system. Humans and most animals have centralized brains, meaning it is all grouped together in one spot, forming what we envision as a brain. Plants may not have a centralized brain like humans, but that doesn’t mean they lack a brain, in fact plants have “decentralized intelligence” distributed throughout them. Since plants cannot react quickly, they have no way of defending themselves against predators, so by scattering the “brain” plants avoid dying off when damaged (Marinelli). The root tips and sensory cells allow plants to feel and react to different stimuli. It is uncertain as to whether plants feel pain, but they do respond to anesthetics and react to being damaged. For example, when a caterpillar eats a plant’s leaf, the plant begins to secrete defensive chemicals. The censor cells react to the damage being done and cause the leaf to secrete chemicals to fend off the predator, as well as repair the
The body is composed of cells, which form the basic unit of life. Unique cells found in the body are the stem cells. These cells are biological cells that are not specialized for particular functioning in organisms. They can be distinguished since they have the ability to differentiate or divide into multiple body cells, and their ability to replicate self. They are unique in the way they can renew themselves by undergoing cell division when inactive for a long period. It is also possible to induce stem cells to organs or tissue cells under some conditions. When the cells divide, they replenish the cells in a living organism. They serve as an internal system that repairs and replaces the tissues that are worn out.1 Dividing cells may remain as stem cells or become specialized in their functions, for instance red blood cells, brain or muscle cells.
The Lives of a Cell: Notes of a Biology Watcher by Lewis Thomas consists of short, insightful essays that offer the reader a different perspective on the world and on ourselves.
parts, and each part has its own job. The nucleus of a cell is very similar
The endothelial cells in direct contact with blood cells are called vascular endothelial cells while those in contact with lymph are called lymphatic endothelial cells.
B) The plasma membrane on the outside of the cell is required since it separates the innards from the ouside (Module 14, slide 4). They are can perform this fuction since they are made of a lipid bilayer with hydophilic and hydrophobic parts to keep the inside of the cell prrotected from the outside environment (Campbell 99).
The body is composed of cells. Normally, these cells divide at a composed and calculated manner. If cells die or are destroyed, the body creates more cells through the division of existing cells. However, occasionally, problems with some cells in the body may occur.
Cytoplasm is a jelly-like fluid inside the cell in which the organelles are suspended. All life activities except reproduction happen here. In a basketball stadium the fans are like cytoplasm in a plant cell. The fans are like cytoplasm because they are all over the stadium like cytoplasm is all over the plant cell. This is how cytoplasm is like the fans because they both are all around the
All organ system work together; in order to keep and support the conditions that the cells, tissues, and organs need to function properly. Each organ system has an important function in the body. There is one system that is not as well known as other; it is the integumentary system. Most people know the organs of the integumentary system, but they do not know that these organs work together to form this system.
plasma membranes, meaning animals and plants contain lipids. In this paper I will display and
Cells are able to grow and reproduce. Cells reproduce by splitting and passing on their genes (hereditary information) to Daughter cells. The nucleus always divides before the rest of the cell divides. Therefore each daughter cell contains their own nucleus. The nucleus controls the cells activities through the genetic material DNA. The cells in a body are all the same except the gametes they were all made from one cell, the Zygote. This is the cell that was formed when two gametes from your parents fused.
"The general idea is an old one, that any two cells or systems of cells that are repeatedly active at the same time will tend to become 'associated', so that activity in one facilita...
Cells are the basic building blocks of all living things. The human body is composed of trillions of cells. They provide structure for the body, take in nutrients from food, convert those nutrients into energy, and carry out specialized functions. But it also contains highly organized physical structures which are called intracellular organelles. These organelles are important for cellular function. For instance Mitochondria is the one of most important organelle of the cell. Without Mitochondria more than 95% of the cell’s energy, which release from nutrients would cease immediately [Guyton et al. 2007].
The Animal Cell is a little bit different than the Plant Cell for only a couple of reasons. One is how the Plant Cell has a cell wall and the Animal Cell doesn’t. The cell wall protects and gives structure to the cell. Then there is the Nucleus, which serves as a control center for the cell. Inside the Nucleus there are one or more Nucleoli. They are dense, granular bodies that disappear at the beginning of cell division and reappear at the end. Then you have the Cytoplasm. This is the watery material lying within the cell between the cell membrane and the nucleus. The Cytoplasm also contains organelles, which have specific functions in the cell metabolism. Then there are the Golgi Bodies, which serve as processing, packaging, and storage for the cell. These organelles package and ship things out. Another parts of the cell, a very important one in fact, are the Lysosomes. These organelles are used to break things down and contain enzymes.