Creatinine has a renal clearance of 140 mL/min due to the fact that
A. it is absorbed by the loop of Henle.
B. it is secreted by the glomerulus.
C. it is absorbed by the renal tubules.
D. it is secreted by the renal tubules.
E. it is produced in the pulmonary tissue.
Answer: C. it is absorbed by the renal tubules.
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A. only one of the blood types. B. only type O blood. C. only two of the blood types. D. all blood types.
Which of the following situations occurs in electrically excitable cells?
A. Depolarization causes voltage-gated sodium ion channels to open. B. Sodium ion channels are opened by high extracellular calcium levels. C. The sodium-potassium pump moves sodium into the cell. D. When Na+ ion channels open, K+ ion channels close. E. The opening and closing of ligand-gated channels cause depolarization.
Which of the following regions of a sarcomere contain thin filaments?
a) I band b) A band c) H zone d) Both I band and A band. e) All of these answer choices are correct.
The sternoclavicular joint is a saddle joint with a ________ range of movement.
A. wide B. narrow