Examlex
Which of the following allows the knee to move freely by providing lubrication and reducing friction?
Sac
A fluid-filled structure in the body which can enclose or secrete substances, as in cysts or secretory cells.
Hemoptysis
The expectoration (coughing up) of blood or bloody sputum from the lungs or airways.
Spitting
Ejecting saliva forcibly from one's mouth, sometimes as a response to an irritant or infection.
Basophil
A type of white blood cell involved in inflammatory reactions and allergic responses by releasing histamine and other mediators.
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