BIOB32H3 Study Guide - Final Guide: Gastrocnemius Muscle, Sciatic Nerve, Taste Receptor

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8 May 2012

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1. When groups of sensory receptors can encode a broader variety of stimulus intensities
because the receptors vary in the extent to which they each are activated by given
stimulus intensities, this is called what?
A. Range fractionation ********
B. Responsiveness segregation
C. Intensity differentiation
D. Activity allometry
E. Receptor isolation
2. In the context of the mammalian kidney, what is the “vasa recta”?
A. The vasculature associated with the ascending and descending Loops of Henle
B. The vascular bundle that interfaces with the Bowman’s capsule
C. The artery and vein that feeds each of the kidneys
D. The tubules of a cortical nephron that are functionally equivalent to the Loop of Henle
in a juxtamedullary neprhon
E. The vascular net that surrounds the urinary bladder
3. The frequency of AP firing by a sensory neuron is NOT influenced by which of the
A. Stimulus intensity
B. Amplitude of the receptor current
C. Refractory period
D. Duration of stimulation (how long the stimulus has already been occurring)
E. None of the above (they all influence AP firing rate) ***********
4. True/False: There is no current flow within neurons in myelinated portions, only at the
A. True
B. False **********
5. How does caffeine act on fatigued muscle cells to alleviate fatigue?
A. Binds to ACh receptors to enhance EPSPs in muscle fiber
B. Binds to actin fibers to enhance cross-bridge formation
C. Acts to promote stronger pulse of Ca++ release from sarcoplasmic reticulum
D. Enhances oxidative phosphorylation rates
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