Fertilisation and Implantation — Prelims Questions

Which of the following events occurs earliest during human fertilisation?

Which hormone is secreted by the trophoblast cells of the blastocyst and is crucial for maintaining the corpus luteum in early pregnancy?

The process of implantation in humans typically involves the blastocyst embedding into the uterine wall. Approximately how many days after fertilisation does this process usually begin?

Which of the following structures is responsible for secreting enzymes that help the sperm penetrate the zona pellucida?

Which of the following statements about the zona pellucida is INCORRECT?

An ectopic pregnancy occurs when implantation takes place outside the uterus. Which of the following is the most common site for an ectopic pregnancy?