Final answer:
During mammalian exercise, oxygen delivery is enhanced by multiple physiological responses including increased blood flow and oxygen extraction by tissues, as well as a decrease in systemic vascular resistance. These processes work together to ensure efficient oxygen supply to the muscles, with venoconstriction also contributing to overall cardiovascular function.
Step-by-step explanation:
When a mammal exercises, oxygen delivery is increased by several mechanisms, including increased blood flow, the extraction of more O2 per unit volume of blood, and a lowering of resistance in the systemic vasculature. Therefore, the correct answer is e. All of the above.
Venoconstriction plays a role in regulating the cardiovascular system by increasing blood pressure within the vein, increasing blood flow within the vein, and increasing the return of blood to the heart, so the correct answer is d. all of the above.
Some factors that do not facilitate the transfer of oxygen to tissues include a decreased body temperature and increased viscosity of the blood. However, increased exercise is known to improve oxygen delivery, making option a. decreased body temperature the correct answer for what will not facilitate oxygen transfer.