make these more factual:
Lesson 1: Your Cells and Systems
Even when you are sound asleep each night, you have systems that are hard at work.
Lesson 2: Bones and Muscles Working Together
Your skeletal and muscular system work hand in hand to provide you with support, protection, and movement. Without one, the other would not work.
Lesson 3: The Digestion and Elimination Cycle
Food journeys more than 20 feet through your body every time you eat?
Lesson 4: Heart, Lungs, and Nerves Working Together
The heart is the only muscle in your body that never stops working?
Lesson 1: Your Cells and Systems
Even during sleep, various systems in your body continue to function.
Lesson 2: Bones and Muscles Working Together
The skeletal and muscular systems collaborate to offer support, protection, and allow movement.
Lesson 3: The Digestive and Elimination Process
Food travels more than 20 feet through the body during each meal.
Lesson 4: Heart, Lungs, and Nervous System Collaboration
The heart is the only muscle in the body that functions without stopping.
Add one more fact
Lesson 1: Your Cells and Systems
Even during sleep, various systems in your body continue to function.
Lesson 2: Bones and Muscles Working Together
The skeletal and muscular systems collaborate to offer support, protection, and allow movement.
Lesson 3: The Digestive and Elimination Process
Food travels more than 20 feet through the body during each meal.
Lesson 4: Heart, Lungs, and Nervous System Collaboration
The heart is the only muscle in the body that functions without stopping.
The lungs can hold up to 6 liters of air with each breath.