What heart sound occurs with closure of AV valves?Group of answer choicesS1 (first heart sound)S2 (second heart sound)S3 (third heart sound)S4 (fourth heart sound)

When the first heart sound is heard, what is occuring with the heart valves?Multiple ChoiceThe semilunar valves are closing.The AV valves are opening.The semilunar valves are opening.The AV valves are closing.

Which of the following indicates the first and second heart sound in the correct order a. Atrioventricular valve closure — semilunar valve closure b. Ventricular diastole — atrioventricular valve closure c. Atrial systole — ventricular systole d. Ventricular systole — semilunar valve closure

Heart sounds are generated when blood vibrates the wall of the heart due to the ______ of the valves.Multiple choice question.stretchingopeningclosing

The opening and closing of the heart valves is associated with ______.Multiple choice question.changes in blood oxygenationchanges in blood compositionchanges in chamber pressurestretch of tissue fibers in the pericardium

Fill in the Blank QuestionFill in the blank question.The AV valves guard the opening between the and , which are chambers of the heart.