How does the movement of muscles attached to the ribcage and diaphragm initiate expiration? The muscles relax, which which flattens the diaphragm and increases the volume of the chest cavity.
The muscles relax, which pulls the ribcage downward and decreases the volume of the chest cavity.
The lungs contract and push the air from the lungs.
The lungs relax and pull the air into the lungs.

answer:   option a) glucagon was secreted by his pancreas before he ate the cookies because blood glucose was low. insulin was secreted after he ate the cookies because his blood glucose was high.

explanation:

the sun's light combined with the visible wavelenghts form what is called ultraviolet radiation, which are the long waves at the end of a visible light sprectrum.

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