During pregnancy in mammals, a fetus is connected to the mother by an umbilical cord and a placenta. Through this umbilical cord and placenta, the fetus receives oxygen and nutrients from the mother and eliminates any waste produced.

Question

Which body systems MOST DIRECTLY work together with the mother's reproductive system to deliver nutrients to and remove waste from the fetus?
A Digestive, excretory, immune, respiratory
B Circulatory, excretory, nervous, respiratory
Digestive, endocrine, respiratory, skeletal
• Circulatory, digestive, excretory, respiratory

Answer 1

The body systems that MOST DIRECTLY work together with the mother's reproductive system to deliver nutrients to and remove waste from the fetus are primarily involved in the exchange of materials. The correct answer is:

Circulatory, digestive, excretory, respiratory

1. Circulatory System: The mother's circulatory system is responsible for delivering oxygen and nutrients to the fetus via the placenta and umbilical cord, as well as removing waste products from the fetus.

2. Digestive System: The mother's digestive system provides the nutrients that are absorbed into her bloodstream and then transported to the fetus through the placenta.

3. Excretory System: The mother’s excretory system plays a role in removing waste products from her bloodstream, which helps maintain a healthy environment for the fetus.

4. Respiratory System: The mother's respiratory system supplies oxygen to her blood, which is then transported to the fetus through the placenta.

Thus, option Circulatory, digestive, excretory, respiratory is the best choice.