Answer:
A: Oxygen levels are low and, therefore, more red blood cells are produced, giving the athletes an advantage when competing at lower altitudes.
Explanation:
<em>At high altitudes, the partial pressure of oxygen is lower compared to lower altitudes</em>. The body system try to adjust to lower oxygen level by undergoing several physiological changes. Depending on the duration spent in high altitude, the body can either try to adjust in the short term or acclimatize for a longer term.
One of the processes the body undergoes during acclimatization is an increase in red blood cell production. The kidney secretes erythropotein in response to inadequate oxygen in body tissues, and this makes the liver to increase erythrocyte production.
The increase in red blood cell production correspondingly increases the oxygen-carrying capacity of the blood as a result of increased hemoglobin. This condition persists for a few weeks even after the body returns to lower altitude where oxygen is adequate. Increased oxygen capacity means the rate of energy production (through respiration) within the body will also increase
<em>Hence, those who acclimatize to high altitude usually experience increased capillary density, tissue perfusion and improved athletic performance at lower altitudes. </em>
The correct option is A.
FALSE<span>The diet planning tool, MyPlate, is available only to health care professionals</span>
There will most likely be a net movement of water into the cell. This is because the concentration of solutes outside the cell is greater than inside the cell
Homan's Test is an
examination procedure of the ankle to test for dorsiflexion, which signals thromboembolism.
This is done by putting patient in supine position with leg straight, and then
raising the leg 10 degrees. The examiner will then dorsiflex the foot and
squeeze the calf. Pain in the calf upon flexion of the ankle with the leg
straight means a positive Homan's sign.
