The presence of meat (undigested proteins) in the digestive tracts stimulates the secretion of gastrin into the: A) duodenum
B) liver
C) pancreas
D) blood

c. nephron

Explanation: The nephron is the functional unit of the kidney, which actively filters blood and generates urine. The nephron is made of the renal corpuscle and renal tubule. Cortical nephrons are located within the renal cortex, whilst juxtamedullary nephrons are observed inside the renal cortex near the renal medulla.