Exam 10: Physical Activity- Thermoregulation

The body's thermoregulatory mechanisms primarily protect against overheating.

Radiation is a form of heat transfer that does not require molecular contact between objects.

The most important performance-enhancing nutrient when physical activity and heat stress combine.

Osmolality of sweat considered __________ in relation to other body fluids.

Heat acclimatization.

Aging blunts the magnitude of the sweating response by __________.

Athletes who use __________ to lose weight not only produce dehydration but also cause excessive mineral loss associated with muscle weakness and impaired neuromuscular function.

Younger adults recover suboptimally from dehydration compared with older counterparts because of younger adults' reduced thirst drive.

Sweat evaporation from the skin depends on three factors.

Exists when the serum sodium concentration falls below 135 mEq/L.

An imbalance in fluid dynamics when fluid intake does not replenish water loss.

The pituitary gland contains the central coordinating center for temperature regulation.

Should be done to reduce risk of overhydration and hyponatremia during prolonged physical activity?

Sweating is the body's defense against __________. The effect of __________ enables moisture to __________ the body.

Sweat is hypertonic compared with other body fluids.

Thermal receptors in the skin provide input from the periphery to modulate hypothalamic activity.

Provides the major physiologic defense against overheating.

Increased ambient temperature __________ the effectiveness of heat loss by conduction, convection, and radiation.

Sweat gland classification.

Refers to the percentage of water in ambient air at a particular temperature compared to the total quantity of moisture that the air could carry.