smallest and most fundamental unit of matter

the smallest unit of matter that retains all of the chemical properties of an element

calculated mean of the mass number for an element’s isotopes

total number of protons in an atom

adenosine triphosphate, the cell’s energy currency

(also F1F0 ATP synthase) membrane-embedded protein complex that adds a phosphate to ADP with energy from protons diffusing through it

hormone produced by the heart to reduce blood volume, pressure, and Na+ concentration

one-way membranous flap of connective tissue between the atrium and the ventricle in the right side of the heart; also known as tricuspid valve

(plural: atria) chamber of the heart that receives blood from the veins and sends blood to the ventricles(plural: atria) chamber of the heart that receives blood from the veins and sends blood to the ventricles

neurodevelopmental disorder characterized by difficulty maintaining attention and controlling impulses

weakening of a virus during vaccine development

sense of hearing

(also, middle ear) transduces sounds from the air into vibrations in the fluid-filled cochlea

genus of hominins that evolved in eastern Africa approximately four million years ago

neurodevelopmental disorder characterized by impaired social interaction and communication abilities