The murmur is heard due to antegrade flow of blood through a progressively narrowing mitral opening during the end of the ventricular systole.

The vitelline duct narrows progressively and disappears between the 5 and 8 weeks gestation.

As the septum primum grows, the ostium primum progressively narrows.

The binary search algorithm can also be expressed iteratively with two index limits that progressively narrow the search range.

Towers have thicker girth in the lower levels, progressively narrowing to the topmost level.

The gentle slope of the progressively narrowing passageway confirmed what Dax's inner ear had already told her: they were continuing to move steadily downward.

Immediately inland from the Cascade Range there is a broad plateau, narrowing progressively northwards, only a few miles wide in Canada, and also getting higher.

The accumulation of atherosclerotic lesions progressively narrows the arteries feeding the heart and may result in ischemic myocardial damage.

In a convergent nozzle, the ducting narrows progressively to a throat.

The first eleven trunk segments are broad, though progressively narrowing toward the rear, and each bears a pair of biramous appendages.