Which end of the heart is broader and which end is narrow?

Which end of the polypeptide has the first amino acid and which end has the last amino acid? How are they referred to as, respectively?

Which of the following has no end points?

Which of the following has no end points?

Give the term for the period betwent he end of one heart beat to the end of next heart beat.

Give the term for the period between the end of one heart beat to the end of next heart beat.

Which of the following events takes place in cardiac cycle after the end of first heart sound and before the onset of second heart sound?