Topics:
Animal Physiology, Animal Refresher
Types of Nephron
Which of the following is a type of nephron?
- Cortical nephron only
- Juxtamedullary nephron only
- Both cortical and juxtamedullary nephron — Correct Answer
- None of the above
Explanation:
Correct Answer: Both cortical and juxtamedullary nephron
There are two types of nephrons in the mammalian kidney:
1. Cortical Nephron
- Has a short loop of Henle located primarily in the cortex.
- Main function: reabsorption and secretion of substances.
- These nephrons do NOT play a major role in urine concentration.
2. Juxtamedullary (JM) Nephron
- Has a long loop of Henle that extends deep into the renal medulla.
- Main function: concentrating the urine (via countercurrent mechanism).
- Species variation in % of JM nephrons: Beaver: 0%, Pig: 3%, Human: 14%, Cat & Dog: 100%.
- Dog and cat can produce the most concentrated urine because 100% of their nephrons are juxtamedullary.
Countercurrent Mechanisms
- Countercurrent multiplier: Loop of Henle
- Countercurrent exchanger: Vasa recta
📚 About this Topic — Animal Physiology
This multiple choice question is from Animal Physiology, Animal Refresher. It has 4 options with a detailed explanation of the correct answer. Practice more MCQs from Animal Physiology to strengthen your preparation.
