After sitting for many hours during a trans‑pacific flight, a passenger jumps up quickly as soon as the "fasten seat belt" light is turned off, and immediately falls to the floor, unconscious! within seconds of being in the horizontal position, however, consciousness is restored. select the option that completes the explanation of what happened.
upon standing, there is a time lag before the person’s heart responds to the:
o increased downward force of the top of her head on her blood. lying horizontally removes the downward force.
o increased pressure difference between her feet and her head. lying horizontally reduces the pressure difference.
o reduced fluid density in her brain, which causes a lack of oxygen. lying horizontally restores the proper fluid density.
o rush of blood and other fluids up into her head. lying horizontally equalizes her fluid levels once again.

increased pressure difference between her feet and her head. Lying horizontally reduces the pressure difference.

Explanation:

The autonomic nervous system controls heart function to adapt to the effect of body positional changes. In some circumstances it takes a few seconds. So even if the passenger would have been held upright she would have recovered consciousness. The horizontal position sped up things

1.Temperature

2.Moisture

3. PH: acidic or basic concentration

Explanation:

Different microorganism grow at different temperature. For example, many human-disease-causing microbes have an optimum temperature of 37C, and most of the bacteria do not grow at temperature higher than 45C. This means that any temperature lower than 45C will favor the growth of certain bacteria while higher temperature may cause death or reduction in the population of most. Hence, the effect of temperature on these organisms.

Water is required to dissolve the cell substances in microorganism just like higher animals.  while some can survive under an extremely dry condition, most can't and this could result in death or reduction in population.

PH, a measure of the hydrogen concentration in a solution for most microorganism is between 6-8, too much of acid or base could disrupt the activities of these organisms and a maintained range ensure an optimal survival.