The water flea Daphnia performs an approximately constant number of heart beats and then dies. On the average, the flea lives twice as long as 15°C as at 25°C. Estimate the activation energy for the reaction that controls its heart rate
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The water flea Daphnia performs an approximately constant number of heart beats and then
dies. On the average, the flea lives twice as long as 15°C as at 25°C. Estimate the activation
energy for the reaction that controls its heart rate
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- Nitroglycerin has its positive cardiovascular effect by stimulating the production of which increased O CAMP: vasodilation O CGMP; vasodilation O DAG; Ca+2 release to cardiac cells DAG; cardiac cell growth CAMP; cardiac cell growthYou have conducted a study to test the swimming velocities of trout in water of a single temperature after being acclimated to different temperatures. You raised trout offspring in water held at a constant temperature of 8°C, 16°C, 24°C, 32°C, or 40°C. During your experiment, you recorded the maximum velocity of each trout raised in the different temperature environments at 0.02, 0.07, 0.11, 0.21, and 0.12 meters per second, respectively. As you are writing your report, you realize you forgot to record the temperature of the water in which you tested the swimming performance of the trout. Using the data from your study, determine the most likely temperature of the water in which you tested the swimming performance of the trout. Water temperature 8°C 16°C 24°C 32°C 40°C Swimming speed 0.2 0.07 0.11 0.21 0.12 O 15°C O30°C 25°C 40°C 5°C 道 87°FExplain why the evolution of the four-chambered heart was critical for the development of an endothermic lifestyle – the generation of internal heat – in birds and mammals.
- Each of the following statements briefly describes one of Hb an allosteric interactions. Which of the statements below are false? A drop in the [H+] of blood plasma would lead to a decrease Hb affinity for O₂. An increase in the partial pressure of CO₂ in the tissues would lead to a decrease Hb affinity for O₂- If you inhaled CO for an extended period of time, at partial pressures 1000 fold higher than normal indoor atmospheric pressure, your body would have a difficult time delivering oxygen to your tissues. When the partial pressure of oxygen is low within the atmosphere, your body responds by increasing the biological activity of Hb's negative effectors.Caffeine lowers the heart rate by increasing rates of depolarization at the SA node True False Nicotine raises the heart rate because it stimulates the activity of the sympathetic neurons in medulla oblongata True False The Frank-Starling Law of the Heart states that the force of heart contraction is directly proportional to the initial length of the muscle fiber, within optimal limits of length True False If the sarcomeres stretched beyond the optimal length, the force of contraction would go down, but that can potentially happen only during open heart surgery when the heart is not constrained by the pericardium, lungs, ribs and diaphragm. True False It is the Na+ channel-driven spontaneous depolarization that is affected by sympathetic and parasympathetic inputs to speed up or slow down the firing rate of the SA node and other conductive cells. True FalseIn the countercurrent heat exchange mechanism, which type of blood provides heat to the other? arterial blood to venous blood venous blood to arterial blood either mechanism works
- Which of the following combinations would all result in an increase in stimulation to breathe? Group of answer choices decrease in PCO2 : increase in H+ : decrease in PO2 increase in PCO2 : increase in H+ : decrease in PO2 decrease in PCO2 : decrease in H+ : decrease in PO2 increase in PCO2 : decrease in H+ : increase in PO2 decrease in PCO2 : decrease in H+ : increase in PO2When a person is in a state of heat exhaustion, trying to reduce body temperature is a priority over trying to maintain MAP. With this in mind, explain why people in a state of heat exhaustion have a rapid heart rate, but low stroke volume.There is an animal that uses almost 100 percent of the oxygen in its blood. Analyzing the Hb of this animal, it’s found that 2,3-BPG does not bind to Hb, but bicarbonate ions do. Knowing that bicarbonate ions are strong negative allosteric effectors, what do you make of these findings? Why is the animal’s Hb not responsive to 2,3 BGP, but responsive to bicarbonate ions?