BISC 104 - PhysioEx Lab Questions

BISC 104 - PhysioEx Lab Questions - PhysioEx Lab Questions...

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PhysioEx Lab Questions 1. 2hr OGTT level aboe 200mg/dl: confirms diabetes dx 2. 2hr. OGTT level b/w 140-200mg/dl: impaired glucose tolerance 3. absolute refractory period: period when cell membrane is totally insensitive to additional stimuli, regardless of the stimulus force applied. 4. ACTH: hormone released by the anterior pituitary. stimulated by a hypothalamic hormone, CRH, inhibited by cortisol. 5. Action Potential: large reversal of the membrane polarity that occurs when the membrane depolarizes to threshold. 6. active transport: the movement of molecules across a membrane that requires the expenditure of cellular energy (ATP) 7. Addison's disease (primary adrenal insufficiency): low cortisol level, high ACTH level 8. anemia: low count in RBC 9. anisocytosis: abnormal sizes of RBCs 10. avg. blood volume for females: 27.5ml/lb 11. avg. blood volume for males: 30ml/lb 12. conductivity: ability to transmit an impulse (to take the neural impulse & pass it along the cell membrane) 13. convert lbs to gms to find out gm wt. of blood: [ weight(lbs) x 454g/lb ]/ 12 = gm wt. of blood 14. cortisol: hormone secreted by the adrenal cortex, is key to the long-term regulation of stress. stimulated by ACTH. 15. CRH: hormone that stimulates ACTH secretion, inhibited by cortisol 16. cushing's disease (secondary hypercortisolism): high cortisol level, high ACTH level 17. cushing's syndrome (primary hypercortisolism): high cortisol level, low ACTH level 18. depolarization: reversal of membrane potential due to influx of sodium ions. 19. Describe the process of excitation-contraction coupling.: An AP in a motor neuron triggers the release of Ach. Ach diffuses into the sarcolemma & binds to receptors in the muscle cell. The resulting change in ion permeability triggers a depolarization of the
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plasma membrane called an end plate potential. The end plate potential triggers a series of events that results in the contraction of a muscle cell. 20. Describe the three phases of a muscle "twitch": Latent period: period of time that elapses b/w the generation of an AP in a muscle cell & the start of a contraction. Contraction phase: a period of time that starts at the end of the latent period & ends when muscle tension peaks. Relaxation phase: period of time from peak tension until the end of muscle contraction. 21. diffusion: the movement of molecules from an area of higher concentration to an area of lower concentration as a result of random thermal motion 22. Does the addition of ether to the nerve cause any permanent alteration in neural response?: No, has no lasting effect. Ether impairs the ability of nerve fibers to function. (Blocks nerve transmission) 23. Equation to calculate the original number of RBCs in 1 cu mm (method 1): cell count from all 5 squares x dilution factor/ # of squares counted x vol. of individual square 24. Equation to calculate the original number of RBCs in 1 cu mm (method 2): cell count ( dilution x area x depth) 25. facilitated diffusion:
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BISC 104 - PhysioEx Lab Questions - PhysioEx Lab Questions...

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