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TLS Online TPP Program

#Question id: 11165

Membrane lipids in tissue samples obtained from different parts of a reindeer’s leg have different fatty acid compositions. Membrane lipids from tissue near the hooves contain a larger proportion of unsaturated fatty acids than those from tissue in the upper leg. What is the significance of this observation?

#Unit 2. Cellular Organization
  1. The temperature of body tissues at the extremities is higher than that of tissues closer to the center of the body. If lipid is to remain fluid at this lower temperature, it must contain a higher proportion of unsaturated fatty acids; unsaturated fatty acids lower the melting point of lipid mixtures.
  2. The temperature of body tissues at the extremities is lower than that of tissues closer to the center of the body. If lipid is to remain fluid at this lower temperature, it must contain a higher proportion of saturated fatty acids; unsaturated fatty acids lower the melting point of lipid mixtures.
  3. The temperature of body tissues at the extremities is lower than that of tissues closer to the center of the body. If lipid is to remain fluid at this lower temperature, it must contain a higher proportion of unsaturated fatty acids; unsaturated fatty acids increase the melting point of lipid mixtures.

  4. The temperature of body tissues at the extremities is lower than that of tissues closer to the center of the body. If lipid is to remain fluid at this lower temperature, it must contain a higher proportion of unsaturated fatty acids; unsaturated fatty acids lower the melting point of lipid mixtures.

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TLS Online TPP Program

#Question id: 11941

#Unit 7. System Physiology – Animal

Under conditions of normal renal function, which of the following is true of the concentration of urea in tubular fluid at the end of the proximal tubule?
TLS Online TPP Program

#Question id: 11942

#Unit 7. System Physiology – Animal

A patient’s urine is collected for 2 hr, and the total volume is 600 ml during this time. Her urine osmolarity is 150 mOsm/L, and her plasma osmolarity is 300 mOsm/L. What is her “free water clearance”?
TLS Online TPP Program

#Question id: 11944

#Unit 7. System Physiology – Animal

The maximum clearance rate possible for a substance that is totally cleared from the plasma is equal to which of the following?
TLS Online TPP Program

#Question id: 11945

#Unit 7. System Physiology – Animal

A patient has the following laboratory values: arterial pH = 7.13, plasma HCO3− = 15 mEq/L, plasma chloride concentration = 118 mEq/L, arterial Pco2 = 28 mm Hg, and plasma Na+ concentration = 141 mEq/L. What is the most likely cause of his acidosis?
TLS Online TPP Program

#Question id: 12070

#Unit 7. System Physiology – Animal

A 26-year-old man develops glomerulonephritis, and his GFR decreases by 50% and remains at that level. For which of the following substances would you expect to find the greatest increase in plasma concentration?
TLS Online TPP Program

#Question id: 12071

#Unit 7. System Physiology – Animal

The most serious hypokalemia would occur in which of the following conditions?