Q1. Which organ plays a role in detoxification and excretion of bilirubin?A. KidneyB. LiverC. LungsD. Skin
Q2. The descending limb of Henle’s loop is:A. Permeable to water, impermeable to electrolytesB. Impermeable to water, permeable to electrolytesC. Permeable to both water and electrolytesD. Impermeable to both water and electrolytes
Q3. Which of the following excretory organs is responsible for osmoregulation in earthworms?A. Flame cellsB. NephridiaC. Malpighian tubulesD. Green glands
Q4. Which statement about urea excretion is incorrect?A. Urea is produced in the liver from ammonia.B. Urea is completely reabsorbed in the nephron.C. Ureotelic organisms excrete urea as their main nitrogenous waste.D. Urea is partially reabsorbed in the nephron.
Q5. Which of the following statements regarding nephron function is incorrect?A. The proximal convoluted tubule reabsorbs glucose and amino acids.B. The Loop of Henle plays no role in water conservation.C. The distal convoluted tubule is involved in ion exchange.D. The collecting duct adjusts water reabsorption under the influence of ADH.
Q6. Which of the following is incorrect about excretion in humans?A. The skin excretes small amounts of urea and salts through sweat.B. The liver plays a role in the excretion of bile pigments.C. The lungs excrete nitrogenous waste.D. The kidneys filter metabolic waste from the blood.
Q7. Which of the following statements about ADH is incorrect?A. ADH increases water permeability of the collecting ducts.B. ADH is secreted in response to low blood volume.C. ADH promotes sodium excretion in urine.D. ADH plays a role in water retention in the kidney.
Q8. Which of the following statements about nitrogenous waste excretion is incorrect?A. Ammonia is excreted by ammonotelic organisms.B. Uric acid is highly toxic and water-soluble.C. Ureotelic organisms excrete urea as their primary nitrogenous waste.D. Humans are ureotelic organisms.
Q9. Which of the following statements about urea excretion is incorrect?A. Urea is a nitrogenous waste product formed from protein metabolism.B. Urea is reabsorbed completely by the nephron.C. The liver converts ammonia into urea.D. Ureotelic animals excrete urea as the primary nitrogenous waste.
Q10. The counter-current mechanism in the kidney functions primarily to:A. Increase blood pressureB. Conserve glucoseC. Concentrate urineD. Regulate acid-base balance