1988
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Hace 4 días · The respiratory membrane is formed where the walls of a capillary touch the walls of an alveolus. At the respiratory membrane, gas exchange occurs freely between the air and blood through the extremely thin walls of the alveolus and capillary.
Hace 4 días · The cell membrane, also called the plasma membrane, is found in all cells and separates the interior of the cell from the outside environment. The cell membrane consists of a lipid bilayer that is semipermeable. The cell membrane regulates the transport of materials entering and exiting the cell.
Hace 2 días · A mitochondrion ( pl. mitochondria) is an organelle found in the cells of most eukaryotes, such as animals, plants and fungi. Mitochondria have a double membrane structure and use aerobic respiration to generate adenosine triphosphate (ATP), which is used throughout the cell as a source of chemical energy. [2]
Hace 5 días · Nervous system - Neurons, Membrane, Signals: The principles outlined above can be applied to the neuron and its ionic contents. The plasma membrane of the neuron is semipermeable, being highly permeable to K+ and slightly permeable to Cl− and Na+.
Hace 3 días · Each lung is enclosed within a pleural sac of two membranes called pleurae; the membranes are separated by a film of pleural fluid, which allows the inner and outer membranes to slide over each other whilst breathing takes place, without much friction.
Hace 5 días · Introducing membrane proteins is an option, but adjustment of physical parameters, such as osmotic pressure 37,38,39,40,41, area-to-volume ratio and membrane rigidity 42,43,44,45,46, are often ...
Hace 2 días · Immune system, the complex group of defense responses found in humans and other advanced vertebrates that helps repel disease-causing entities. Immunity from disease is conferred by two cooperative defense systems: innate immunity and acquired immunity. Learn more about the immune system’s mechanisms and evolution.
