HOMEOSTASIS

Which process involves the filtration of molecules smaller than blood cells and plasma proteins?

• Diffusion

• Reabsorption

• Secretion

• Ultrafiltration

What is the main factor contributing to ultrafiltration in the glomerulus?

• Lack of podocytes

• High permeability

• Small surface area

• Low hydrostatic blood pressure

Where does reabsorption of valuable substances occur in the nephron?

• Distal tubule

• Proximal tubule

• Bowman's capsule

• Loop of Henle

What is actively transported from the ascending limb of the loop of Henle into the interstitial fluid?

• Water

• NaCl

• Urea

• Glucose

Which substance is actively secreted into the tubule in the proximal tubule to control pH levels in body fluids?

• Ammonia

• K+

• HCO3-

• H+

What is the main function of podocytes in the glomerulus?

• Reabsorb water

• Act as a course filter

• Act as a fine filter

• Secrete waste products

What is the primary function of the collecting duct in the nephron?

• Secrete urea

• Reabsorb glucose

• Reabsorb NaCl

• Reabsorb water

Which part of the nephron reabsorbs 80% of the filtrate back into the peritubular capillaries?

• Loop of Henle

• Proximal tubule

• Distal tubule

• Collecting duct

What is the main function of the thin segment of the loop of Henle?

• Reabsorb glucose

• Reabsorb NaCl

• Reabsorb water

• Secrete urea

Which substance diffuses out of the duct in the inner region of the medulla in the collecting duct?

• Urea

• Glucose

• NaCl

• HCO3-