By Douglas Light
Cells are the smallest devices in a position to maintaining lifestyles, they usually make up almost each point of the human physique. From the strands of hair on the best of the pinnacle to the nails on arms and feet, each constitution of the human physique consists of cells. teams of cells shape tissues and organs, which permit the physique to operate as an equipped approach. epidermis, the body's biggest organ, kinds a water-proof barrier that gives safety opposed to invading microorganisms and acts as a sensory and thermoregulatory constitution. "Cells, Tissues, and Skin" explores the homes of every of those elements in bodies.
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Additional resources for Cells, Tissues, and Skin (Your Body: How It Works)
Sample text
Q 6/21/03 1:05 PM Page 59 Cytoplasm provide a physical framework that determines cell shape, reinforce the plasma membrane and nuclear envelope, and act as scaffolds for membrane and cytoplasmic proteins. They also are used for intracellular transport and for various types of cell movements. q 6/21/03 1:05 PM Page 60 5 The Nucleus: A Command Center for Cells The nucleus of a cell is a spherical or oval structure averaging about 5 micrometers in diameter, making it the largest cytoplasmic organelle.
4). q 6/21/03 1:03 PM Page 40 40 CELLS, TISSUES, AND SKIN In some instances, water and solute particles are forced through membranes by hydrostatic pressure. This process is called filtration. The force for this movement usually comes from blood pressure, which is created largely by the pumping action of the heart. Like diffusion, filtration across a membrane is a passive process. However, in this case the driving force is a pressure gradient that actually pushes solute-containing fluid from the higher-pressure area to a lower-pressure area.
The endosymbiotic theory suggests they evolved from freeliving bacteria. The cytoskeleton is an elaborate network of protein structures in the cytoplasm consisting of microtubules, microfilaments, and intermediate filaments. q 6/21/03 1:05 PM Page 59 Cytoplasm provide a physical framework that determines cell shape, reinforce the plasma membrane and nuclear envelope, and act as scaffolds for membrane and cytoplasmic proteins. They also are used for intracellular transport and for various types of cell movements.
Cells, Tissues, and Skin (Your Body: How It Works) by Douglas Light
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