Human Development

Some events in the human reproductive cycle
1. Pre-embryo releases hCG, which maintains hormone levels
2. A hormone signals the follicle to rupture
3. Blstocyst is implanted
4. The egg is fertilized to form a zygote

Numerical response:
The above events in the sequence in which they occur during the reproductive cycle are ___ ___ ___ ___


2.) A human female could be infertile or sterile for all the following reasons except

a. endometriosis in which the endometrial tissues start to grow outside the uterus
b. Damaged ova caused by exposure to radiation or toxic chemicals in the environment
c. An obstruction in the epididymis that restricts the normal passage of gamates
d. blocked fallopiam tubes as a result of scar tissue or bacterial infections (Chlamydia)