During the period of ejection in the cardiac cycle (when blood is leaving the ventricles), the atrioventricular valves are and the semilunar valves are .

Based on the observation that only male crickets produce a song, you hypothesize that a male's song is a form of communication to potential mates. you set up a simple experiment to test this hypothesis. in the laboratory, you place a male snowy tree cricket in enclosure a, which is adjacent to enclosureb. in enclosure b, you place other insects, one at a time, and observe their responses to the male's song. the enclosures are designed so that the two insects being tested cannot see or smell each other, but sound is transmitted from enclosure a to enclosureb.

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Your client has just been prescribed oral iron. why would you advise this client to avoid taking their medication with coffee, tea, eggs, or milk?