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Quartiles (MA)

Figure 40.11 Age-based comparison of the quartile values of R (area of the COX cytochemical precipitate/overall area of each mitochondrion). The quartile values are the respective means of the I, II, III, and IV groups of data ordered by increasing values of the area of synaptic mitochondria (from the rat cerebellar cortex). In adult animals there is a progressive decrease in R (quartiles I—II: -4.7%, quartiles II-III: -9.3%, quartiles III-IV: -11.5%); in old rats an increasing trend can be envisaged (quartiles I-II: +2.6%, quartiles II-III: +3.0%, quartiles III-IV: +2.7%). The paired-quartile decreases in R due to aging were: I (-31.6%), II (-26.4%), III (-16.4%), IV (-3.0%). As clearly shown by the intersection point of the two lines, the very large mitochondria showed almost the same values of R (adult animals 0.30, old animals 0.29). (Reproduced with permission from Naturwissenschaften 92, 82-85, 2005.)

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Blood Pressure Health

Your heart pumps blood throughout your body using a network of tubing called arteries and capillaries which return the blood back to your heart via your veins. Blood pressure is the force of the blood pushing against the walls of your arteries as your heart beats.Learn more...

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