What are spincter muscles?

Explanation:

A sphincter is a circular muscle that normally maintains constriction of a natural body passage or orifice and which relaxes as required by normal physiological functioning. ... There are over 60 types in the human body, some microscopically small, in particular the millions of precapillary sphincters.

sphincter muscle, any of the ringlike muscles surrounding and able to contract or close a bodily passage or opening. ... There is also a sphincter in the eye, the sphincter pupillae, a ring of fibres in the iris that contracts the pupil in the presence of bright light...

Explanation:

Pura Wikipedia lele.. XD, BTW spelling mei 'h' missing Tha...!

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the relative standard reduction potential of the half-cell in which reduction occurs; more positive than the other half-cell. reduction is a chemical process in which electrons are added to an atom or an ion; it always occurs accompanied by oxidation of the reducing agent.

ionic bonds are two oppositely charged ions that attract. a sodium ion has a 1 positive charge; a chloride ion has a 1 negative charge. sodium and chloride have oppostive charged ions that attract which forms an ionic bond. a chemical bond formed when two atoms share electrons is called