What is the main function of the circulatory system?

Which two systems interact to put oxygen into the blood and take carbon dioxide out?

The movement of an elbow bending is coordinated by which system?

The endocrine system produces chemicals that affect organ functions. These chemicals are called

Nutrients from digested food enter the blood stream through the process of

The kidneys, which remove dissolved wastes from the blood, are organs of which system?

Which two systems of a rabbit’s body must be working together for the rabbit to run away from a fox?

Running is an activity that causes the cells in the muscular system to use oxygen at a faster rate. Which system responds by delivering more oxygen to these cells?

Which human body systems are directly involved in reflex actions, such as knee jerk, blinking, and jumping when startled?

What does the blood contain when it comes from the lung?

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