- A Fluid that lubricates the birth canal mainly during the final stages of the childbirth delivery process, secreted by cervical glands under typical conditions according to standard textbooks
- B Fluid surrounding the fetus in the amniotic sac; provides cushioning against trauma, maintains temperature, allows fetal movement, and is swallowed by fetus to develop digestive system
- C Fluid that is secreted mainly by the specialized trophoblast cells of the developing placenta tissue itself, separate from the amnion in general practice as frequently described in most textbook accounts
- D Fluid whose main function throughout much of the pregnancy is the direct transport of nutrients toward the growing fetus via diffusion during normal conditions as generally observed
Correct answer: B. Fluid surrounding the fetus in the amniotic sac; provides cushioning against trauma, maintains temperature, allows fetal movement, and is swallowed by fetus to develop digestive system
Explanation: Amniotic fluid surrounds and protects the fetus: (1) Mechanical cushion against trauma; (2) Temperature regulation; (3) Allows unrestricted fetal movement (essential for musculoskeletal development); (4) Fetus swallows it, developing digestive system; (5) Contains exfoliated fetal cells used in amniocentesis for prenatal diagnosis.
Concept context
Male and female reproductive systems, gametogenesis, fertilization, implantation, pregnancy, and reproductive health.