Pls help me very urgent do not spam
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Answered by
2
Answer:
hey mate thsi is your answer (no spam)
Explanation:
a) respiratory system
b) lungs,heart
c) intercoastal muscles expand increasing the chest cavity
Answered by
3
Answer:
2 a. the organ system is skeleton system
2 b. the heart and lungs are protected by ribcage.
Explanation:
2 c. When you breathe in, or inhale, your diaphragm contracts and moves downward. This increases the space in your chest cavity, and your lungs expand into it. The muscles between your ribs also help enlarge the chest cavity. They contract to pull your rib cage both upward and outward when you inhale.
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