- Joined
- May 7, 2011
- Messages
- 90
- Reaction score
- 3
Hi all ! I was wondering if someone could please help me out with some questions that I'm not quite understanding.
1) Why is the urine with a much higher osmolarity than plasma? I thought that the collecting duct reabsorbs all water under the influence of ADH, thus makes the filtrate more concentrated with less urine. When TPR is mentioning plasma, are they referring to the IF? I'm confused because I thought the IF and the collecting duct end up balancing the osmolarity gradient since the IF is reabsorbing all the water and sodium. Since sodium is being reabsorbed, shouldn't the osmolarity be less than the IF (plasma)
2) What would happen if the estrogen and progesterone levels in a woman's blood were kept high for the entire month?
The answer is the woman would not be able to ovulate. But why? What's the reasoning behind it? I thought if pregnancy does not occur, then secretion of estrogen and progesterone decline and menstruation happens.
1) Why is the urine with a much higher osmolarity than plasma? I thought that the collecting duct reabsorbs all water under the influence of ADH, thus makes the filtrate more concentrated with less urine. When TPR is mentioning plasma, are they referring to the IF? I'm confused because I thought the IF and the collecting duct end up balancing the osmolarity gradient since the IF is reabsorbing all the water and sodium. Since sodium is being reabsorbed, shouldn't the osmolarity be less than the IF (plasma)
2) What would happen if the estrogen and progesterone levels in a woman's blood were kept high for the entire month?
The answer is the woman would not be able to ovulate. But why? What's the reasoning behind it? I thought if pregnancy does not occur, then secretion of estrogen and progesterone decline and menstruation happens.