Cells

A:

The longest cells in the human body are neurons. Neurons are cells within the nervous system and carry messages throughout the body.

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  • What is the function of the cell body?

    Q: What is the function of the cell body?

    A: The main function of the cell body of a neuron is to integrate synaptic information and transmit this information to other cells via the axon. The cell body also completes a variety of biochemical processes to keep the neuron functioning properly.
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  • How does skin regenerate?

    Q: How does skin regenerate?

    A: Skin regenerates by filling the gap between the sides of the cut with newly generated skin cells, starting with the dermis (bottom-most layer of the skin) and working its way up. Very shallow cuts are followed by easy regeneration, as only the stratum basale layer (the deepest layer of skin) of the epidermis (the outermost layer of the skin) is needed to generate enough cells to repair the damage.
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  • What is the function of the mitochondrion?

    Q: What is the function of the mitochondrion?

    A: A mitochondrion produces energy for a cell. Mitochondria (the plural of mitochondrion) are small organelles found in most nucleated cells, including those of plants, animals and fungi.
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  • What organelle produces ATP?

    Q: What organelle produces ATP?

    A: The mitochondria inside a cell produces ATP, or adenosine triphosphate. Cellular respiration is responsible for ATP production, a process in which ATP production occurs after biochemical energy from nutrients is converted.
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  • What is a cell membrane?

    Q: What is a cell membrane?

    A: A cell membrane is a thin layer that acts as a barrier that separates an individual cell or a cellular compartment from other surrounding structures. This dynamic layer plays an essential part in the transport of ions and nutrients.
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  • Why do cells divide?

    Q: Why do cells divide?

    A: Cells divide as a way of reproducing or growing or to create sex cells. Cells can only reach a certain size due to a lack of balanced growth between their parts, so they have to divide once they reach a certain point. Sex cells, such as eggs and sperm, are only created through specialized cell division.
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  • Why does a cell make a copy of its DNA before mitosis occurs?

    Q: Why does a cell make a copy of its DNA before mitosis occurs?

    A: A cell makes a copy of its DNA before mitosis occurs so there is a set of DNA for the daughter cell after mitosis has occurred. Because each cell needs its own set of DNA, there must be two sets of DNA present in a cell before it divides into two.
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  • What are the three parts of the cell theory?

    Q: What are the three parts of the cell theory?

    A: The three fundamental propositions of classical cell theory are that the cell is the most basic unit of life, all life is made up of cells and cells are formed only by other cells. Each tenet of this theory is important to understanding the way living things function on every level.
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  • What is the largest cell in the world?

    Q: What is the largest cell in the world?

    A: The largest cell in the world is an ostrich’s egg. Sometimes weighing over 3 pounds, the ostrich’s egg is composed of a single cell, as all other animal eggs are.
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  • What is a summary of mitosis?

    Q: What is a summary of mitosis?

    A: During mitosis, a cell enlarges, splits and multiplies DNA, and then separates into two daughter cells. During this reproductive cycle, the cell goes through five different phases.
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  • What is the function of a cell membrane?

    Q: What is the function of a cell membrane?

    A: A cell membrane protects the structures within the cell. Cell membranes are semipermeable, meaning that only certain objects are able to pass through them. Cell membranes also give shape to the cell and support its structure.
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  • What is the purpose of cell division?

    Q: What is the purpose of cell division?

    A: Cell division has three purposes for an organism: reproduction, growth and maintenance. For single-celled organisms, this is their direct and only method of reproduction, and it serves no other purpose. For multicellular organisms, cell division is a step in reproduction and is necessary for growth and maintenance.
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  • What makes plant and animal cells different?

    Q: What makes plant and animal cells different?

    A: There are several key differences between plant and animal cells, such as cell wall structure, presence or absence of plastids, lysosomes and centrioles and shape of vacuoles. These characteristics are the primary and most distinct differences between plant and animal cells. However, they only exist in organisms classified as eukaryotic, and occur primarily in central organelles.
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  • What is the function of cytoplasm?

    Q: What is the function of cytoplasm?

    A: Cytoplasm has many functions in both prokaryotic and eukaryotic cells, including aiding in the movement of cellular materials and transporting the genetic material and products of cellular respiration. It also acts as a liquid medium to suspend organelles and helps cells expand during reproduction.
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  • What are some of the main functions of skin cells?

    Q: What are some of the main functions of skin cells?

    A: Some of the main functions of skin cells are to provide protection, perceive and transmit sensation, control evaporation and regulate temperature. Skin cells, which are epithelial cells, are also self-repairing and reproduce quickly. Epithelial cells are the most commonly found of the four tissue types.
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  • What is the control center of a cell?

    Q: What is the control center of a cell?

    A: The nucleus is the control center of a cell. The nucleus controls the cell's growth and reproduction and contains the cell's DNA.
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  • What is the function of the cheek cell?

    Q: What is the function of the cheek cell?

    A: A cheek cell, an epithelial cell found in the tissue on the inside lining of the mouth, continually secretes mucus to maintains a moist environment in the mouth. Together with salivary glands that secrete saliva, the cheek cells supply enough moisture in the mouth for enzymes to thrive. This moisture softens food, assists in swallowing and starts digestion.
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  • What is the function of collar cells in sponges?

    Q: What is the function of collar cells in sponges?

    A: Collar cells beat their flagella back and forth to force water through the sponge. Collar cells also pick up tiny bits of food brought in with water.
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  • What organelle is the site of protein synthesis?

    Q: What organelle is the site of protein synthesis?

    A: There are four organelles found in eukaryotic cells that aid in the synthesis of proteins. These organelles include the nucleus, the ribosomes, the rough endoplasmic reticulum and the Golgi apparatus. All of these organelles help produce and process proteins, but only the ribosomes actually piece together amino acids into proteins.
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  • What is diffusion in science?

    Q: What is diffusion in science?

    A: Diffusion is the action of molecules moving from an area of high concentration to an area of lower concentration. It is caused by kinetic energy.
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  • What is the function of the dermis layer of cells?

    Q: What is the function of the dermis layer of cells?

    A: The dermis layer of skin is beneath the epidermis, and its main function is temperature regulation and blood supply. The dermis also gives skin its thickness, and it makes up roughly 90 percent of the thickness of skin.
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