Nutrient and waste requirements for the developing fetus are handled during the first few weeks by:
- the placenta
- diffusion through the endometrium
- the chorion
- the blastocyst
Progesterone is made during the third trimester by the:
- endometrial lining
- corpus luteum
Which contraceptive method is 100 percent effective at preventing pregnancy?
- oral hormonal methods
Which type of short term contraceptive method is generally more effective than others?
- natural family planning
Which hormone is primarily responsible for the contractions during labor?
Major organs begin to develop during which part of human gestation?
- first trimester
- second trimester
- third trimester