BIO 260 LAB FINAL - negative feedback mechanism –Answer An increa...

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BIO 260 LAB FINAL

• If Hormone A causes the production of Hormone B, what would be an ex- ample of a

negative feedback mechanism –Answer An increase in Hormone B decreases the production of Hormone A

• Steroid sex hormones suppress the secretion of GnRH, LH, and FSH

–Answer True

• What would decrease FSH secretion

–Answer High levels of androgens

• How can we control for the possible effects of the stress of oral injection and the injected oil

when evaluation the effects of the treatments 1 and 2 –Answer Compare treatment 1 and 2 rabbits to rabbits injected orally with oil mixed with banana

• How can we control for the possible effects of the stress of oral injection and the injected

saline when evaluating the effects of treatment 3 –Answer Compare treatment 3 rabbits injected orally with banana plus physiological saline

• Testosterone and progesterone both act to block endometrial thickening in rabbits

–Answer True

• Both testosterone and progesterone exert negative feedback on LH and FSH secretion by the

anterior pituitary –Answer True

• Follicle-Stimulating Hormones, FSH

–Answer Increases male fertility 1 / 3

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• DMAU likely suppresses sperm and motility due to negative feedback of testosterone on LH

and FSH secretion –Answer True

• Based on the results, what should be investigated next to obtain the best fertility inhibitor

for rabbits –Answer The effect of different doses of progesterone or testosterone on fertility, health, and vitality of females

• Which muscle seems to be more suited to slower, sustained movements like walking

–Answer The solues - Type I

• How does passive tension change with muscle length

–Answer Increases

• How does active twitch tension change with muscle length

–Answer Increases then decreases

• Tetanus Kinetics

–Answer When muscle sustains contraction for a period of time

• What could explain the faster contraction and relaxation speeds of the EDL relative to the

soleus –Answer The EDL has more sarcoplasmic retilulum

• Why might the EEDL generate a higher force during a single twitch, but the two muscles

generate similar forces when stimulated at 40 Hz –Answer The EDL can release more calcium with a single twitch, but at 40 Hz, both muscles achieve similar cytoplasmic calcium levels

• Why might the Soleus show fused tetanus peaks and higher forces at a lower stimulation 2 / 3

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frequency than the EDL –Answer The EDL is faster at pumping calcium out of the cytoplasm.

• Why might the EDL fatigue more quickly than the soleus

–Answer The EDL (tires earlier) uses mostly anaerobic metabolism but the soleus uses mostly aerobic metabolism

19. TYPE I

–Answer Slow twitch, long walks

20. TYPE II

–Answer Sprints, EDL

• What. do hematologists work with

–Answer Blood

• What's the role of an anticoagulant in hematology

–Answer Prevent blood clotting

• Role is blood clotting

–Answer Platelets

• What's the role of red blood cells

–Answer Transport of Oxygen. (O2) from. the lungs

• What are neutrophils, eosinphils, basophils, lymphocytes, and monocytes-

–Answer They are all white blood cells

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