A MUSCLES The movements your muscles make are coordinated and controlled by the brain and nervous system.
bone marrow <span>contains hematopoietic stem cells, which give rise to the three classes of blood cells that are found in the circulation: white blood cells (leukocytes), red blood cells (erythrocytes), and platelets (thrombocytes)</span>
The factor that makes the football training exercise unsafe is the possibility of dehydration of the players.
<h3>What is a strenuous exercise?</h3>
A strenuous exercise is one that takes a lot of energy from the person that is engaging in it. Being engaged in a strenuous exercise would mean that the person would sweat so much and loose a lot of fluid in the process.
In the course of strenuous exercise, it is possible for a person to become dehydrated especially on a hot day when the temperature is as high as 81°f and the relative humidity is 80 percent.
This makes it important that these practice sessions must hold at a time when the weather is not extremely hot and so much arrangement must be made to keep the members of the team hydrated throughout the football practice.
Learn more about dehydration:brainly.com/question/10625552
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