In which gender is the urethra part of the reproductive system?
A. Male
B. Female
C. Both male and female
D. Neither male nor female
Answer: A
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Tubular secretion
a. involves transepithelial transport b. is the movement of a substance from the peritubular capillary blood into the tubular fluid c. always occurs by active transport d. is both a and b e. is both b and c
True or False? Calcitonin reduces blood calcium levels.
Answer the following statement true (T) or false (F)
Identify the types of cells in the pancreatic islets and the hormones produced by each
A) Alpha cells produce insulin, beta cells produce glucagon, delta cells produce a peptide hormone like GH-IH, and pancreatic polypeptide cells produce pancreatic polypeptide hormone. B) Alpha cells produce a peptide hormone like GH-IH, beta cells produce glucagon, delta cells produce insulin, and pancreatic polypeptide cells produce pancreatic polypeptide hormone. C) Alpha cells produce insulin, beta cells produce a peptide hormone like GH-IH, delta cells produce glucagon, and pancreatic polypeptide cells produce pancreatic polypeptide hormone. D) Alpha cells produce glucagon, beta cells produce insulin, delta cells produce a peptide hormone like GH-IH, and pancreatic polypeptide cells produce pancreatic polypeptide hormone. E) Alpha cells produce glucagon, beta cells produce a peptide hormone like GH-IH, delta cells produce insulin, and pancreatic polypeptide cells produce pancreatic polypeptide hormone.
Which of the following statements about the refractory period of a membrane is TRUE?
A. The absolute refractory period refers to the period of time during which another action potential cannot be initiated in that part of the membrane that is undergoing an action potential, no matter how great the strength of the stimulus. B. The relative refractory period refers to the period of time during which another action potential can be initiated in that part of the membrane that has just undergone an action potential if a stronger than normal stimulus is applied. C. The refractory period prevents the action potential from spreading back over the part of the membrane that just underwent an action potential. D. The refractory period places an upper limit on the frequency with which a nerve cell can conduct action potentials. E. All of the above choices are correct.