1- Always lies in the cortex
corpuscule
tubule
collecting duct
loop of Henle

2- ______ of several nephrons empty into ________
proximal tubule / loop of Henle
glomeruli / proximal tubule
loop of Henle / distal tubule
distal tubule / collecting duct

3- Juxtamedullary nephrons
are 80-85% of total
lie compleately in the medulla
have long loops of Henle
2nd and 3rd are correct

4- The macula densa
is at the site were loop of Henle contacts afferent arteriole
is part of the juxtaglomerullar aparatus
is in the wall of the afferent arteriole
1st and 2nd are correct

5- Principal cells
have ADH receptors
have aldosterone receeptors
can be found at the end of the distal tubule
all of the above

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Answers:

1- Always lies in the cortex
Answer: corpuscule

2- ______ of several nephrons empty into ________
Answer: distal tubule / collecting duct

3- Juxtamedullary nephrons
Answer: 2nd and 3rd are correct: lie compleately in the medulla AND have long loops of Henle

4- The macula densa
Answer: 1st and 2nd are correct: is part of the juxtaglomerullar aparatus AND is in the wall of the afferent arteriole

5- Principal cells
Answer: all of the above: have ADH receptors AND have aldosterone receptors AND can be found at the end of the distal tubule