FACT IDEA LEARNING ISSUES ACTIONAt the start 1. In order for his body to 1. What is responsible for raisingJimmy’s heart rate was gain enough oxygen and Jimmy’s heart and respiratory85 beats per minute and energy, Jimmy rate and stimulating sweatinghe was breathing 18 stretching and warm up, just before the race?breathes per minute. Hefelt nervous excitement. 2. Since the temperature of 2. Why is the sympatheticHis mouth dry and took Jimmy’s body increase, division of the autonomicone last sip of water the sweat gland become nervous system active just more active to release before the race? sweat. 3. What changes do you think are 3. Jimmy try to adapt to occurring in the digestive and the new environment urinary systems at this time? from relax to stress and that’s why at this moment the autonomic 4. What is happening to Jimmys nervous system become blood glucose levels just before active the race? 4. The urinary system is 5. Why is Jimmys mouth dry? not active because the bladder is closed. The digestive system also not active because the peristalsis decrease 5. His blood glucose level starts to drop.
6. The salivary glands have started to reduce its excretion of saliva.One minute in 1. The body need more 1. Rowing full speed is puttingJimmy heart rate was energy to perform. new demands on Jimmys201 beats per minute. Sugar in the form of body. What are these newHe was taking 2 lactose is secreted by demands and how does thebreathes per stroke, fast muscle, and once lactose body respond to them?and forced. The stroke is secreted, blood sugarrate was 34 strokes per in blood will lower 2. What changes in Jimmysminute and his Body muscles promote unloading oftemperature was 37.5°C. 2. When oxygen reduces, O2 from hemoglobin for use byhe was sweating more the carbon dioxide will the muscle cells?and jimmy feel burning increase. Jimmy needon muscles more oxygen for aerobic 3. Why do Jimmys muscles feel respiration. He breath like they are burning? more rapidly than. 4. What conflict is produced 3. Jimmy’s muscles are between Jimmys need to keep experiencing sensory his body cool and his need to information from his remove nitrogenous wastes nervous and the muscle from his blood? What did he cell is accumulated with do before the race to help lactic acid. alleviate this conflict?
At the halfway mark 1. Jimmy had decreased the 1. Since the end of the firstHe still rowing at 34 demands his muscles minute, Jimmy has decreasedstrokes per minute, now were making by the end the demands his muscles arejimmy heart rate was of the first minute, and making. How has he done this?180 beats per minute this can be explained by And why has he done this?and his body the fact that the "fighttemperature was 38°C. and flight" message from 2. What are the changes in hisHis respiratory rate the brain had slowed conditions as a result?down slightly. down with less production of adrenaline, hence less energy demand from the muscles. 2. Jimmy’s nervous system changes would include "fight and flight" response which is usually activated in a stressful situation. 3. His heart and lungs have to work over harder so it get with the respiratory and cardiovascular system with the physical strain that he is enduring,. His brain sends signals to the lungs to breaath faster and deeper and the heart
to beat faster. Increase amounts of blood gets pumped to the muscles, carrying oxygen and removing carbon dioxide. 4. in order to withstand the demand of Jimmy pushing his body to the very limits of its capabilities, all body’s systems work together Homeostasis is maintained by negative feedback which response to reduce Jimmys body back to its original state.At the finish 1. Jimmy reduces his heavy 1. Jimmy has stopped rowing andHis heart rate was 208 breathing since his body his muscles are now at rest.beats per minute. He needs to cool down again Why are his heart andBreathe nearly 80 times to pre exercise levels, and breathing rates still so high?per minute. He felt like like heart rate, it’s a laghis arms and legs were time involved, so after he 2. What changes have occurred toon fire and sweats was stops, his breathing rate his blood chemistry since thepouring out of every gradually or quickly falls start of the race? Think aboutpore of his body. He felt but still stays high, (but glucose levels, pH, lactatelight-headed and his depending on his levels, and temperature.body temperature was recovery ability which is 040 C. dependent on his fitness) 3. Why is he sweating more now
than during the race?2. The pumping of blood to bring oxygen to muscle and pumping of hot blood from muscle to the skin are overcome by breathing rapidly where the heat can be dissipated more quickly. When he finishes the race the heart beat slow down and pumps less blood to the skin. The heat accumulated in muscle causing blood temperature to rise higher. So, it can sweat more right after finish the race then during the race.3. Changes occur in glucose when the glucose level in blood increase. It is because the body need energy to race so the body used the glucose during performed. For the changes in pH, when increases the muscle activity, it leads to increase the CO2 and
Hydrogen level in blood. These chemical are produces cell metabolism and they lower blood pH or increase the acidity. Then during perform, blood level of lactate rises because when exercise stop the lactate falls much more slowly than during the build up. For the temperature, working muscle will produce heat so the body temperature rise the race started.Back at the dock 1. The changes occur in the 1. What change have occurred inHis heart rate and last ten minutes that the last 10 minutes to allowrespiratory back to allow his heart and Jimmy’s haeart and respiratorynormal and his body respiratory rates to come rates to come down.temperature 37.5°C. he down caused by thefelt thirsty and take positive feedback loop.small sips of water and This loop causeshis weighed 76kg. everything to return to 2. Why is Jimmy four pounds normal causing his heart lighter than at the start of the and respiratory rates to race? return to normal. 3. What effect has this water loss had on his endocrine system?
2. Jimmy’s mass reduced because of the 4. Why did Jimmy only take sips dehydration by excessive of water after the race? What loss of in his body fluids could happen if he drank as so his mass getting much as he wanted to? lighter at the end of the race.3. Anti-diuretic hormone (ADH) from his endocrine system is increasing to overcome water loss. It’s produced by the hypothalamus and released by the pituitary. It will signal the kidneys tubules to absorb more water.4. Jimmy was dehydrated after the race and he lost a lot of fluid. So if he directly drinks the water, his muscle will contract and give him muscle cramping. The small sips also allowed his body to adjust to his state of dehydration.