A. Excretion by fetal kidneys.
B. Maternal hemostasis.
C. Fetal intestinal absorption.
The fluid shown in the picture above represents amniotic fluid.
Amniotic fluid originates from
- In early pregnancy – As an ultrafiltrate of maternal plasma (i.e., option “b” correct).
- By beginning of the second trimester – It consists of extracellular fluid which diffuses through the fetal skin (i.e., option “e”).
- After 20 weeks – Cornification of skin prevents this diffusion and amniotic fluid is composed of fetal urine (option “a” correct).
Also know : The water in the amniotic fluid is completely changed and replaced in every 3 hours.
Other minor contributors :
- Pulmonary fluid
- Fluid filtering through the placenta
The fetus swallows 200 – 500 ml liquor every day at term. (Option “c” correct) i.e. Excretion by fetal kidneys; Maternal hemostasis; Fetal intestinal absorption.