Positive Feedback System Case Study

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1. Does the body adjust its pH by glomerular filtration, tubular reabsorption or tubular secretion? Explain how it does so. Body adjust its pH by tubular secretion, because hydrogen ions generated by the dissociation分离 of the carbonic acid碳酸 are secreted by sodium-linked counter transport in exchange for Na+ in the tubular fluid and then into the bloodstream, where they help prevent changes in plasma pH. 酸离子是由于碳酸分离而生成的,碳酸是由于sodium-linked counter 跟钠交换得来的。 2. Which white blood cells have the main roles in the specific immune response? Lymphocytes 淋巴细胞 3. Removing _______fribrinogen______from the blood stops it from clotting. 4. What does it suggest if you find red blood cells in urine? An abnormal amount of blood in…show more content…
Yes, because sodium is actively transported from the tubules into the peritubular capillaries, water and chloride passively follow the movement of sodium. 13. Is labour is an example of a negative or a positive feedback system? Explain. Positive Feedback. Another example of beneficial positive feedback is seen in childbirth, where stretching of the uterus triggers the secretion of a hormone , oxytocin, which stimulates uterine contractions and speeds up labor. 14. Do the maternal and foetal bloods mix during a normal pregnancy? Explain. During the normal course of a pregnacy, No. The mothers and babies blood does not mix or circulate together. The umbilical cord attaches to the placenta. The placenta is the "container" that keeps the baby "isolated" from the mother. The fetal blood flows through the baby, out the umbilical cord to the placenta and no further. 15. Where would we find most of the body's fluid- in the intracellular compartment, or the extracellular compartment? Intracellular compartment 16. What does it suggest if you find white blood cells and nitrites in urine? Urinary tract infection 17. The renin-angiotensin system is an important regulator of urine formation; explain briefly how it

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