Final answer:
The most appropriate treatment for a football player complaining of severe neck pain and tingling in their arms and legs after being tackled is to keep them very still, call for emergency medical assistance, and provide basic first aid without moving their head or neck.
Step-by-step explanation:
If a football player complains of severe neck pain and tingling in his arms and legs after being tackled, the most appropriate treatment is to keep the person very still and not move them, as moving them could cause further injury and complications. It is important to call 911 or the local emergency medical assistance number to get professional help. In the meantime, you can provide basic first aid, such as stopping any bleeding and making the person comfortable, without moving their head or neck. This can help prevent additional damage while waiting for emergency care to arrive.