Final answer:
(A) Lying down on his back with his legs elevated .When a person feels faint, they should lie down on their back with legs elevated to improve blood flow to the brain, which helps prevent fainting. This position relates to managing Orthostatic Hypotension and utilizes homeostatic mechanisms to stabilize internal conditions.
Step-by-step explanation:
If a person is feeling like he is going to faint, he should be placed in position (A) Lying down on his back with his legs elevated. This position helps in improving blood flow to the brain, which can help prevent fainting. There are specific positions that can help manage Orthostatic Hypotension, a condition where blood pressure drops on standing, leading to dizziness or fainting. A person lying down is described as being in a supine position when face up, which is recommended if they feel like they are going to faint. Elevating the legs further helps increase the return of blood to the heart and then to the brain, stabilizing blood pressure and oxygen supply to the brain.
This practice is based on homeostatic mechanisms where the body works to maintain stable internal conditions. When a person changes position from sitting or lying down to standing, the cardiovascular system must adjust quickly to maintain blood flow to the brain against gravity. In cases where this system is temporarily overwhelmed or dysfunctional, lying down with legs elevated helps to restore balance.