Area in the Medulla of Brain that regulates Respiration by increasing the duration of inspiration and inhibiting expiration.
Apical Surface
Surface of the Epithelial Cells exposed to the external surface such as the atmosphere or passage they line.
Apex Beat
The location on the Chest wall where the Ventricle hits during every Contraction.
Apex
Upper part or top in pyramid-shaped structures. The opposite end of the base.
Aortic Semilunar Valve
The valve located between the Left Ventricle and the Aorta.
Aortic Bodies
Chemoreceptors located near the arch of the Aorta.
Aorta
The largest Artery. Leads from the Left Ventricle.
Anus
The last part of the Digestive Tract from which fecal matter is eliminated from the body.