Blood pH exists within a narrow range of values. Describe the role of buffer systems in achieving blood pH homeostasis
What will be an ideal response?
Buffers are chemical systems that resist changes in pH and prevent large swings in pH when an acid or a base is added to a solution. A buffer typically consists of a weak acid and its corresponding anion. When blood becomes too basic or alkaline, the weak acid releases hydrogen ions into the blood to lower the pH. When the blood becomes too acidic, the anion binds hydrogen ions in the blood. The removal of hydrogen ions from the blood offsets the decrease in pH.
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Organized groups of cells (plus their intercellular substances) that have a common purpose form a(n) ________.
A) organ B) tissue C) organism D) organ system
Infancy:
a. begins at birth b. ends at about 18 months c. includes the neonatal period d. all of the above
Glomerular hydrostatic pressure is the pressure of
A. solutes in the tubular fluid. B. blood in the glomerular capillaries. C. blood in the nephron capsule. D. filtrate in the glomerular capillaries. E. tubular fluid in the glomerular capsule.
Which of the following statements concerning membrane transport across the plasma membrane is true?
A. All molecules are moved across by active transport. B. Water cannot move through the membrane. C. Lipid-soluble substances pass through the membrane by dissolving in the lipid bilayer. D. Generally, cations pass through the membrane more easily than anions. E. Polar molecules are transported more easily than nonpolar molecules.