â Blood viscosity â Total blood vessel length â Blood vessel diameter Resistance â¢ Factors that remain relatively constant: â Blood viscosity â¢ The stickiness of blood due to formed elements and plasma proteins â¢ Increased viscosity = increased resistance â Blood vessel length â¢ Longer vessel = greater resistance encountered
Jasmonic acid (JA) is derived from the fatty acid linolenic acid. It is a member of the jasmonate class of plant hormones. It is biosynthesized from linolenic acid by the octadecanoid pathway.
Basics. Abscistic acid is a growth inhibitor produced by the chloroplasts of mature leaves. Chloroplasts contain chlorophyll, the substance that uses light to produce photosynthesis. Abscistic acid counters gibberellin and auxin, hormones that encourage seeds to germinate and plants to grow.After the leaves produce abscistic acid, the hormone moves short distances through the phloem vessels to other parts of the plant and is found stems, the caps of roots and in green fruits.thylene. When the plant growth hormones auxin and gibberellin begin to decrease, stem nodes, aging leaves and ripening fruits produce the hormone ethylene. Ethylene, secreted as a gas, works with abscistic acid to promote the aging and falling of fruits and shedding of leaves that precedes dormancy.