TAKE-HOME QUIZ-REES RESEARCH Name Printed hardcopy due at the beginning of lab t
ID: 197775 • Letter: T
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TAKE-HOME QUIZ-REES RESEARCH Name Printed hardcopy due at the beginning of lab the week of February 19% -Emailed or late submissions will not be accepted I. Questions - Reading from LDH Student Handout-Professor Rees's Research 1. How do vertebrates respond to low oxygen levels in their environment? 2. What is the expected relationship for the levels of LDH activity in certain tissues and the level of oxygen in the environment. 3. What is the relationship between exercise, aerobic versus anaerobic metabolism. and LDH activity? II. Questions- Professor Rees's Research Paper-Introduction 4. What is hypoxia? 5. What Louisiana habitats might have frequent periods of hypoxia? 6. What parameter does Dr. Rees use as a measure of aerobic metabolism? 7. What parameter does Dr. Rees use as a measure of anaerobic metabolism? 8. In aquatic animals, what is an oxygen conformer and what is an oxygen regulator?Explanation / Answer
Ans 1:
Vertebrates respond to low levels of oxygen in their environment by the following ways:
Ans 1:
Vertebrates respond to low levels of oxygen in their environment by the following ways:
- Some vertebrates may increase rate of breathing to compensate for low O2 level.
- Renal EPO (erythropoeitin) sense low O2 levels, and signal to increase the circulation of RBCs which carry O2.
- Vertebrates which are exposed to low levels of oxygen, have adapted to keep reserves of oxygen in certain tissues and use them whenever needed. Eg. whale (during diving in deep waters).
- If low levels of oxygen prevail for long periods, vertebrates enter into a condition of hypo-meabolism, (i.e. lower metabolism state) so that there is lesser need of energy, compensating for low levels of oxygen (used to produce ATP by aerobic respiration). Eg. certain frozen lake turtles.
- If levels of low oxygen prevail for longer periods vertebrates may enter into hibernation.
- Some vertebrates have adapted and increased number of capillaries in brain, so that supply of O2 to neurons is efficient.
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