In most cases, that air makes a whistling or wheezing sound as it moves through narrowed passages. Excessive mucus production, shortness of breath, and cough are the other classic symptoms of asthma. But in cough-variant asthma, coughing is the only symptom. It sounds exotic, but it's far from rare.
Definition of photosystem : either of two photochemical reaction centers consisting chiefly of photosynthetic pigments complexed with protein and occurring in chloroplasts: a: one that absorbs light with a wavelength of about 700 nanometers â called also photosystem I b: one that absorbs light with a wavelength of about 680 nanometers â called also photosystem II new!
noun. The definition of a subsystem is a smaller method or procedure within a larger set of methods or procedures. An example of a subsystem is the way a department works in a larger company.ubsystem-Computer Definition. A unit or device that is part of a larger system. For example, a disk subsystem is a part of a computer system. A bus is a part of the computer.