The Excretory System and Urine Formation

Which organs are the main components of the urinary system responsible for eliminating liquid waste?

• Kidneys, bladder, ureters, urethra

• Stomach, intestines, gallbladder

• Heart, arteries, veins, capillaries

• Lungs, liver, pancreas, spleen

What is the primary function of the kidneys within the excretory system?

• Store glucose as glycogen

• Exchange oxygen and carbon dioxide

• Produce digestive enzymes

• Filter blood to form urine

Which nephron structure first receives blood filtrate during urine formation?

• Collecting duct

• Bowman’s capsule

• Convoluted tubule

• Loop of Henle

During glomerular filtration, which substances are prevented from passing into Bowman’s capsule?

• Cells and proteins

• Glucose and amino acids

• Water and minerals

• Urea and uric acid

Which nephron segment is mainly responsible for reabsorbing water from the filtrate?

• Bowman’s capsule

• Loop of Henle

• Renal pelvis

• Collecting duct

Which statement best describes tubular reabsorption?

• Useful molecules move back to blood

• All waste is absorbed into cells

• Proteins are secreted into tubule

• Filtrate becomes blood in arteries

Where does urine flow immediately after leaving the collecting ducts?

• Convoluted tubule

• Bowman’s capsule

• Renal pelvis

• Inferior vena cava

Which pathway correctly traces urine from the kidneys to outside the body?

• Kidney → loop → duct → pancreas

• Kidney → pelvis → artery → urethra

• Kidney → vein → heart → lungs

• Kidney → ureter → bladder → urethra

What triggers the micturition reflex leading to urination?

• Bladder becoming full

• Opening of renal artery

• Closure of urethral sphincter

• Contraction of ureters

Which kidney region contains Bowman’s capsules and convoluted tubules?

• Cortex

• Ureter

• Pelvis

• Medulla