IB 132 Midterm 1 (2004) - IB 132 Midterm 1 (Professor...

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IB 132 Midterm 1 (Professor Lehman, Lectures 1-8)                          February 24,  2004 1. Homeostasis is:  a. Feedback control of key physiological variables b. Maintenance of key physiological variables within a narrow range despite  perturbances c. Maintenance of the “internal milleu” d. Negative feedback control of key physiological variables e. None of the above (Answer: B) 2. Which is not an example of a negative feedback control system? a. Regulation of blood pressure at rest b. Regulation of heart rate at rest c. Regulation of composition of the extracellular fluid d. An anticipatory postural adjustment e. Stretch reflex (Answer: D) 3. Positive feedback systems are: a. Rare in physiology b. Always unstable c. Never useful in physiology d. Important in a sense of well-being e. Not suited for keeping a variable near a setpoint (Answer: E) 4. Feedforward control requires: a. Sensation of the output b. Sensation of the perturbation c. An error in the output d. Comparison between what is desired and what occurs e. The central nervous system
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(Answer: B or E) 5. Advantages of neural signals over chemical signs in physiological control systems do not   include: a. The possibility of different responses in different tissues b. Rapid response c. Long-distance communication d. Ease of computation e. Specific targeting of signals (Answer: A or C) 6. Chemical signals can be used: a. As a signal from one cell to a distant cell or distant cells b. As a signal from one cell to nearby cells only c. As a signal from within a cell to itself d. Within a cell e. All of the above (Answer: E) 7. Diffusion of a small ion for a distance of 1 mm takes about how much time? a. 7 milliseconds b. 7 seconds c. 7 minutes d. 7 hours e.  7 days (Answer: C or D) 8. Which is now a mechanism of action of a lipid-insoluble messenger? a. The first messenger binds to a receptor and causes release of IP3 and DAG b. The first messenger binds to a receptor on the cell’s surface, part of which is an  ion channel c. The first messenger binds to a receptor on the cell’s surface, causing a G protein  to activate an effector protein, also located in the cell’s plasma membrane
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d. The first messenger binds to a receptor on the cell’s surface, which is a tyrosine  kinase e. The first messenger enters the cell, causing intracellular release of a second  messenger (Answer: E) 9. Which is not  a plausible reason for calcium to be a common intracellular signal? a.
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This note was uploaded on 05/07/2010 for the course NUTRI SCI 160 taught by Professor Hellerstein during the Spring '10 term at University of California, Berkeley.

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IB 132 Midterm 1 (2004) - IB 132 Midterm 1 (Professor...

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