By Douglas B. 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 hands and feet, each constitution of the human physique consists of cells. teams of cells shape tissues and organs, which enable the physique to operate as an geared up procedure. pores and skin, the body's biggest organ, varieties a water-resistant barrier that offers safeguard opposed to invading microorganisms and acts as a sensory and thermoregulatory constitution. "Cells, Tissues, and dermis" explores the houses of every of those parts in bodies.
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Additional info for Cells, tissues, and skin
Mitochondria are doublemembraned organelles that produce most of a cell’s ATP. 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.
In addition, membrane proteins exposed to the outside surface of cells may act as receptors. A receptor is a molecule with a binding site that fits the specific shape of a particular chemical messenger, such as a hormone. In this way, chemical messages released by one cell type can communicate with another cell type, thereby influencing its activity. In a similar manner, some glycoproteins on the outer cell surface serve as identification tags that are specifically recognized by other cell proteins in a process called cell-cell recognition.
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 by Douglas B. Light