<span>A stem is one of two main structural axes of a vascular plant. The stem is normally divided into nodes and internodes, the nodes hold buds which grow into one or more leaves, inflorescence (flowers), cones or other stems etc. The internodes act as spaces that distance one node from another.</span>
Leukotrienes are involved in asthmatic and allergic reactions and act to sustain inflammatory reactions.
In asthma, Lekotrienes causes.:
i)airflow obstruction
ii)increased secretion of mucus
iii)mucosal accumulation
iv)bronchoconstriction
v)infiltration of inflammatory cells in the airway wall.
