Where are creatinine, ammonium ions, small amounts of urea, and drugs such as penicillin typically secreted?
A) collecting duct
B) distal tubule
C) proximal tubule
D) ascending limb of the nephron loop (loop of Henle)
Answer: C
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Which of the following does NOT affect the activity of an enzyme?
A. Concentration of cofactors and coenzymes B. Concentration of enzyme and substrate molecules C. pH and temperature D. The organ the enzyme is in
Answer the following statements true (T) or false (F)
1. Hemoglobin can carry oxygen. 2. Hemoglobin can carry carbon dioxide. 3. Oxyhemoglobin carries oxygen from the cells to the lungs. 4. Pernicious anemia results from a lack of iron in the blood. 5. The loss of a large amount of blood can result in anemia.
Most of the renal sinus is filled by which of the following structures?
A. Renal medulla B. Renal pyramids C. Renal cortex D. Minor calyces E. Renal pelvis
Some inhibitory neurotransmitters exert their effect by causing the opening of chloride channels, which results in the postsynaptic membrane becoming more negative.
Answer the following statement true (T) or false (F)