1. How can environmental conditions affect your body's fluid balance? Explain what causes loss of water and salt during exercise. 2. Before exercising, what precautions should you take to reduce risks in each of the hollowing areas: how weather, cold weather, pollution, crime?
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1. Various environmental factors such as temperature, humidity, radiation, and atmospheric pressure affect mainly sweating and urinary water loss, while physical exercise affects, in addition increased respiratory water loss from the increased expiratory volume and frequency of breathing.

Body fluid contains sodium (salt). When people exercise, they sweat. Sweat contains sodium. Sweating deceases sodium, which then increases potassium levels. To restore balance, the person needs to restore fluids and electrolytes.

2. There are a number of precautions you can take when exercising in hot weather, begining with proper hydration. The importance of staying hydrated in hot temperatures can't be overstated.
Precautions for Cold weather
Wear several layers of light clothing instead of one heavy layer.
2. If you exercise in the rain/snow, you will lose body heat quicker.
3. Wear a head covering.
4. Wear shoes with good traction.
5. Try wearing a mask/scarf to keep from getting asthma or irritating bronchitis.
Precautions for pollution

1. Schedule your exercise to avoid major intersections where there is heavy traffic.
2. Monitor reports on air quality.
3. Workout inside
Precautions while exercising in a crime area

Carry your ID with emergency contact information and bring a small amount of cash and a cell phone with you, especially if walking alone. Stay alert by not talking on the phone as you walk and keeping the volume low on your headphones.
Let others know where you’re going and when you plan to be back.
Stick to well-lit places with other people around.
Be seen to be safe. Wear light or brightly colored clothing during the day. Wear reflective material on your clothing and carry a flashlight at night. Put lights on the front and back of your bike.
Wear sturdy, appropriate shoes for your activity that give you proper footing.

Hope this helps

The answer is b. increased blood flow reduces nerve sensitivity