Pain felt in the left shoulder and arm as the result of a heart attack is an example of?
A. referred pain.
B. localized pain.
C. anesthesia.
D. both localized pain and anesthesia.
E. both referred pain and localized pain.
Ans: A. referred pain.
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When the ventricular walls contract,
A. the tricuspid valve opens and the mitral valve closes. B. the mitral and tricuspid valves open. C. the mitral valve opens and the tricuspid valve closes. D. the mitral and tricuspid valves close.
Which of the following statements about the Na+/K+ pump is FALSE?
A) Its activity requires the expenditure of metabolic (cellular) energy. B) It transports Na+ and K+ in a 1:1 ratio. C) It is present in neurons. D) It transports Na+ out of the cell and K+ into the cell.
Which of the following CANNOT diffuse through the plasma membrane?
A) lipid-soluble molecules B) water C) proteins D) water-soluble ions
Compared to the vertebral column, the spinal cord is
A) longer. B) shorter. C) the same length.