Fast heart rate: Tachycardia means fast heart beat. Sinus node is the structure where normally heart rhythm and beat is originated, and it naturally responds to stimuli when the heart needs to beat faster. Inappropriate sinus tachycardia is when the heart is beating fast, when it shouldn't. ...Read more.
An atom is the smallest unit of an element that retains the identity (and the chemical properties) of that element. + 66 others found this useful. Sandra Pinzon.Edit.he atom is the smallest particle of an element that retains it's characteristics. Sub-atomic particles such as protons, neutrons and electrons form the atom and it is the amo â¦ unt of each of these sub-atomic particles that make the element that element. 5 people found this useful.
Indium (atomic number 49, symbol In) is a malleable and soft chemical element, which is similar to thallium and gallium in terms of chemical properties. It is a rare and fusible metal and exhibits intermediary properties between gallium and thallium. The primary source of indium is zinc ores, and it occurs in a compound form in them. Indium rarely occurs in the form of grains of a free or native metal, and these grains are of no commercial importance.