1. How does reproduction require the integrated work of multiple organ systems? 2. Why do you think the atria of the heart are less muscular than the ventricles? Why is the left ventricle more...

1. How does reproduction require the integrated work of multiple organ systems?

2. Why do you think the atria of the heart are less muscular than the ventricles? Why is the left ventricle more muscular than the right ventricle?

3. The pumping of the heart does most of the work that is required to move blood around the body. How do your voluntary movements contribute?