Suppose we collect [N] samples of a signal, with [dt] second…

Suppose we collect [N] samples of a signal, with [dt] seconds between each pair of data points. What is the lowest non-zero frequency that can be mathematically represented by these data? Round your answer to four decimal places if necessary. (This is not asking about the Nyquist frequency.)

Fill in the blanks for the blood’s pathway through the heart…

Fill in the blanks for the blood’s pathway through the heart.   Vena cavae (both)  →   Right atrium   →  Tricuspid (AV) Valve   →     [BLANK-1]    →      [BLANK-2]    →     Pulmonary trunk and arteries    →     [BLANK-3]    →   Pulmonary veins  →   Left atrium    →   [BLANK-4]  valve  →    [BLANK-5]    →  Aortic (SL) valve   →     [BLANK-6]   →    rest of body