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An athlete travels to the Colorado Rockies to train for an upcoming marathon. He runs 15 miles every other day and while breathing O2 deficient air. His blood O2 levels become lowered as a result. His kidney cells sense the reduction in O2 and secrete a hormone, erythropoietin into the blood stream. The hormone circulates to the bone marrow where it acts on stem cells. The stem cells differentiate into mature red blood cells which can carry additional oxygen.
1. What is the stimulus?2. What is the efferent pathway?3. What is the effector?4. Is this a negative or positive feedback mechanism? Explain your answer.
A patient`s blood was centrifugated in a capillary tube. The total height of the column blood was 3.5 cm and the column of packed cells was 1.8 cm. Analysis of hole blood gave a hemoglobin concentration of 12 g%, and counting the RBCs in a hemacyt..
Select two hormones, Describe how each of these hormones contributes to homeostasis. Especially interesting are hormones that are antagonists relative to specific functions of the body.
The supernatant from normal cells corrects the defects in B and C, but not defect in A. Hurler's disease is as a result of the failure to make one particular lysosomal enzyme. The supernatant from A corrects the defect in Hurler's cells, but supernat..
In mice, black eyes (B) are dominant over red eyes (b) and short ears (S) are dominant over having a long floppy ears (s). A black eyed, short eared mouse is crossed with a red eyed, long-eared mouse. The offspring has black eyes and long ears.
An organism has 15 homologous chromosomes. How many gamete combinations are possible during this organism's gametogenesis?
Mr. and Mrs. Jackson have three children. Each of the three is found to have a different blood type. Sarah is type O, John is type A, while Joe is type B. What are the blood type phenotypes and genotypes of Mr. and Mrs. Jackson?
In explaining their findings, the authors have ignored a major threat to the validity of their estimates of exposure. Explain and discuss this error.
32P is an unstable isotope of phosphorus that has a half-life of 14.29 days. Atoms of this isotope undergo beta decay in which a neutron decays into a proton and an electron.
List the steps of the complement fixation test. include diagrams for each step, contrasting the results for a positive sample versus a negative?please help me.
Provide an instance where this definition does not apply and in brief explain why this example does not apply to the species concept.
What is the rate of coagulation of naturally occurring colloids (under various pH and I scenarios)? How may the size spectrum of agglomerates change over time? How quickly do colloidal aggregates settle.
Describe a series of small habitats that exist within 10 or 20 kilometers of your house and which might be subject to MacArthur and Wilson's theory of island biogeography.
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