Question

please answer 17,22, 23

QUESTION 17 Which of the following best describes the role of the syncytiotrophoblast? produces progesterone to maintain the pregnancy gives rise to the chorionic villi O provides the structural basis for the umbilical cord gives rise to the embryonic disk digests uterine cells during the process of implantation

Answer 1

Answer:

17) E) digests uterine cells during the process of implantation

Explanation: Syncytiotrophoblasts is the outer layer of the trophoblasts and actively invades the uterine wall, rupturing maternal capillaries and thus establishing an interface between maternal blood and embryonic extracellular fluid, facilitating passive exchange of material between the mother and the embryo.

22) A. the bicarbonate ions of the salt tie up excess hydrogen ion

explanation: The function of bicarbonate buffer system is to resists decrease in ph by buffering H+ ions. It functions by binding the H+ ion to the bicarbonate.

23) C) Leydig cell

Explanation: Androgen-binding protein (ABP) is a glycoprotein (beta-globulin) produced by the Sertoli cells in the seminiferous tubules of the testis that binds specifically to testosterone (T), dihydrotestosterone (DHT), and 17-beta-estradiol.