In mammalian embryo the pulmonary
aorta communicates with carotico
systemic aorta by a narrow ductus
arteriosus, in the adult this connection
closes leaving
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The number of times a cycle is completed in a second is the frequency. The time taken to complete one vibration is called time period. Frequency and time period is inversely proportional, the number of vibrations per second is frequency.
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Leaving ligamentum arteriosum .
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