4. Researchers were investigating the effect of various factors on the rate of mitosis. MPF (Mitosis Promoting Factor) is thought to cause more cells to begin mitosis in human skin cells. To test this hypothesis, human skin cells were cultured with plain nutrient media and with nutrient media to which MPF was added. After 24 hours, cells were sampled, stained and observed under the microscope to see whether they were in mitosis or interphase. The data obtained is recorded below. Use the data to evaluate whether MPF does cause more cells to enter and thus be in mitosis. (Follow the steps as in problem #1 on a separate sheet of paper.) THINK: How will the data in the middle column be useful to you? The Effect of MPF on the Division of Human Skin Cells Cells Grown without MPF Skin Cells in Mitosis Skin Cells in Interphase 205 1795 Cells grown with MPF 493 2082

Please answer fast a)  Xena chases Callisto, the temperature inside her leg muscles starts to rise. Describe the effect of increased temperature on local autoregulatory control of blood flow in the affected leg muscles.    b) Consider the venous return in Xena’s body and explain how it changes during exercise. Provide your rationale.   c) Explain how the change of venous return you described in response to the previous question affects Xena’s cardiac output. Discuss your answer.   d) Xena is a fit, young person. Compare the change of Xena’s heart rate during physical exercise to that of an unfit and older individual and justify your observation.

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Why is the left ventricle more muscular than the right ventricle (in heart)? Please write very detailed (at least 300 words) explanation. Thanks

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The order for the blood flow was not 100 percent correct. Is there any other order you can think of??