Category: A

A salt in which one or more hydrogen atoms remain unreplaced by the hydroxyl (OH) radical.  

An aqueous solution or gel that is useful in treating excessive dryness of the mouth (xerostomia). A remedy designed to alleviate the symptoms of a persistently dry mouth, which can occur as a side effect of certain medications, radiotherapy, or as a result of Sjögren’s syndrome (an autoimmune disorder characterized by the immune system attacking…

The terminal portion of an air passageway within the lung. Its wall is made of simple squamous epithelium and is surrounded by pulmonary capillaries. This is the site of gas exchange. Each alveolar sac is connected to a respiratory bronchiole by an alveolar duct.  

The expanded end of the allantois, well developed in birds and reptiles.  

One of the two roots by which a spinal nerve is attached to the spinal cord; contains efferent nerve fibers.  

A room in which the boundaries are made so that all sound produced in the room is absorbed (i.e., not reflected).  

A tolerable level of harm or potential harm.  

The internal opening of the inguinal canal.  

The tissue at the nostrils that constitutes the external nasal valve.  

The rhythmic discharges of impulses from the atrioventricular node that occur when the activity of the sinoatrial node is depressed or abolished.