Question

Explain one beneficial and one harmful effect of exposure to sunlight for humans.

Trace the pathway of a bite of hamburger through the digestive system.

How is the volume of the chest cavity increased during inhalation?

Answer 1

a)The beneficial aspect of sunlight is that it stimulates the formation of Vitamin D. A harmful effects of sunlight vary,the foremost being DNA damage like sun cancer.
b)Mouth, Esophagus,Stomach,Small Intestine,Large Intestine
c)The diaphragm is normally dome-shaped & arches up into the chest cavity, but during inhalation it contracts & flattens down, and at the same time, the intercostal muscles expand the ribcage; these two actions increase the chest capacity by up to 75%.

Answer 2

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