Aortic insufficiency (AI), also known as aortic regurgitation (AR), is the leaking of the aortic valve of the heart that causes blood to flow in the reverse direction during ventricular diastole, from the aorta into the left ventricle.
Definition of echidna. : a spiny-coated toothless burrowing nocturnal monotreme mammal (Tachyglossus aculeatus) of Australia, Tasmania, and New Guinea that has a long extensible tongue and long heavy claws and that feeds chiefly on ants; also : a related mammal (Zaglossus bruijni) of New Guinea having a longer snout and shorter spines.
Here you will learn about henna (Lawsonia inermis) and all of the wonderful uses it has. Henna dates back over 5000 years ago and is widely used around the globe. Some call it a shrub and some call it a plant. The henna plant does bloom and thrives in hot dry desert places. Henna is a shrub, not a tree.