10. IDEA Glucose is metabolise and produces heat as by product. FACT Heart rate increases to 201 beats per minute. SOLUTION As exercises intensity increase the demand on energy and oxygen increase as well. Energy or ATP production involves the liberation of energy through the breakdown of glucose. This process breakdown the glucose through a pathway that involves a sequence of glycolytic enzyme. Blood glucose comes from the digestion of carbohydrate and the breakdown of liver glycogen. Metabolism increases its intensity which in result to the increasing of oxygen uptake from its resting value within 1 to 2 minutes. In the effort to meet the muscles’ need for oxygen, the rate and depth of respiration increases which will improve the gas exchange in lungs. As a result heart will beat faster and more forcefully to pump more oxygenated blood to muscles. Arterioles dilate to facilitate delivery of blood to muscle capillaries. LEARNING ISSUE Rowing full speed is putting new demands on Jimmy's body. What are these new demands and how does the body respond to them?
23. FACT Weight 76kg. IDEA Muscle and fat are burning during exercise that cause Jimmy lost his weight. SOLUTION During prolonged activity, carbohydrate reserve becomes depleted, and muscle must rely more heavily on the oxidation of fat for energy production. When carbohydrate reserves are low such low of plasma glucose and low muscle glycogen, the endocrine system can accelerate the oxidation of fat called as lipolysis, thus ensuring that muscle’s energy needs can be meet. From this process, we know that, the losing Jimmy’s weight is due to the losing fat in his body besides the losing of water, nutrient and glucose. LEARNING ISSUE Why is Jimmy four pounds lighter than at the start of the race?
24. Body temperature 37.5°C Endocrine system will inhibit the secretion of water from body. What effect has this water loss had on his endocrine system? Exercise and body water loss stimulate the Endocrine system which is posterior pituitary gland to release ADH. This hormone stimulates water reabsorption from the kidneys, which further promotes fluid retention in the body. Thus, the body attempts to compensate for loss of minerals and water during periods of heat stress and heavy sweating by reducing their loss in urine.
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