Question

quiz instructions
exam 2 will consist of 50 questions from chapters 6 - 9. you will be able to see one question at a time. you will have 90 minutes to complete this exam. good luck!
question 36
people in the united states are commonly deficient in this nutrient, which can result in a decrease in fitness due to reduced oxygen - carrying capabilities.
iron
phosphorus
vitamin b
calcium
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Explanation:

Iron is an essential mineral. It is a key component of hemoglobin in red blood cells. Hemoglobin is responsible for carrying oxygen throughout the body. When there is an iron deficiency, the body cannot produce enough healthy red blood cells, leading to a condition called iron - deficiency anemia. This reduces the oxygen - carrying capabilities of the blood, which can cause a decrease in fitness, such as fatigue, weakness, and shortness of breath during physical activity. Phosphorus is important for bone health and energy metabolism. Vitamin B (there are multiple types like B1, B2, etc.) has various functions including energy production and nerve function. Calcium is crucial for bone and teeth health, muscle function, and nerve transmission. But none of these have the direct role in oxygen - carrying like iron.

Answer:

iron