In humans and many other animals, what organ system is involved in bulk transport of nutrients, oxygen, and signaling molecules?
A)respiratory system
B)circulatory system
C)immune system
D)digestive system

Question

Quizplus · Accepted Answer

The circulatory system is involved in bulk transport of nutrients, oxygen, and signaling molecules through the bloodstream to various organs and tissues in the body. The respiratory system is responsible for gas exchange between the lungs and the bloodstream, but not bulk transport of molecules. The immune system is responsible for protecting the body against pathogens and foreign substances, but not nutrient transport. The digestive system breaks down food and absorbs nutrients, but does not transport these molecules throughout the body in bulk.

In Humans and Many Other Animals, What Organ System Is