You've been sitting cross-legged on the floor of your dorm room while studying. As you stand up to go get a snack, you realize t
hat you've lost feeling in one of your feet. A minute later, all feeling is restored. Being a physiology student, you understand that blood flow was occluded during the time that you were sitting, and that blood flow was restored as you stood up. What else is TRUE? Multiple Choice a.As you stood, vasoconstriction occurred in the foot's blood vessels to protect them from shock. b.The resistance of the blood vessels did not change from sitting to standing, but gravity helped in blood flow. c.High levels of built up CO2 acted as vasoconstrictors in the foot's blood vessels. d.The decreased oxygen content of the foot tissues and the increased levels of metabolic wastes both acted as vasodilators, increasing the flow of blood through the tissues upon standing. The decrea e.All of these are true.
Answer: d. d.The decreased oxygen content of the foot tissues and the increased levels of metabolic wastes both acted as vasodilators, increasing the flow of blood through the tissues upon standing.
Explanation:
Asides being occuled during the incidence, there is also a decreasedoxygen content of the foot tissues and the increased levels of metabolic wastes both acted as vasodilators, increasing the flow of blood through the tissues upon standing.
We've got to differentiate first afforestation to reforestation. The former is planting trees in areas where there is no sign or trace of plants or seedlings before. It's like your making a new environment by your own. The latter is replacing or bringing back what was taken before.
