Final answer:
It is true that tightness and pressure during injections are more important than syringe volume since these factors ensure proper medication delivery and tissue safety. Systemic blood pressure should remain above 60 mmHg for adequate filtration. Short staple cotton was not preferred over long staple cotton before the cotton gin; the gin simply made short staple cotton easier to process.
Step-by-step explanation:
The statement that it is more important to consider the tightness and pressure in the injection portion of the block than the number of cc's the syringe holds is true. In medical contexts, especially during injections, the amount of pressure exerted by the fluid is critical. The pressure ensures that the medication is delivered at an appropriate rate and prevents damage to the surrounding tissues. Similarly, systemic blood pressure must typically stay above a certain level—in this case, 60 mmHg—to ensure proper filtration in the kidneys. If systemic blood pressure drops too low, vital organs may not receive enough blood and can consequently suffer damage due to inadequate filtration.
As for historical applications in agriculture, the statement that short staple cotton was preferred to long staple, prior to the invention of the cotton gin, is false. Long staple cotton has longer fibers and is higher quality, but it was more difficult to process efficiently until Eli Whitney's invention made short staple cotton easier to deseed, thus making it more economically viable and popular.