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muscles that act as valves to open and close openings are____muscles?

a. pennate
b. convergent
c. circular
d. bipennate
e. parallel

2007-02-27 09:43:47 · 1 answers · asked by M_J 1 in Science & Mathematics ➔ Biology

1 answers

Circular,

as in the iris of the eye or any other type of sphincter.

2007-02-27 09:55:00 · answer #1 · answered by jason e 2 · 0⤊ 0⤋

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