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The breakdown of complex food molecules into simpler ones is chemical digestion.

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Please select the best answer from the choices provided

In human digestion, the correct sequence of processes is:

a.

absorbtion, digestion, elimination

b.

digestion, absorption, elimination

c.

elimination, digestion, absorbtion

d.

none of the above

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The involuntary wave of contractions that keep food moving in one direction is called ___.

a.

absorption

b.

peristalsis

c.

esophagus

d.

none of the above

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The fluid that is released in the mouth is called __.

a.

water

b.

saliva

c.

enzymes

d.

proteins

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The digestive system absorbs nutrients from food.

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Peristalsis is a voluntary action.

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What substance in the esophagus lining helps make swallowing easier?

a.

saliva

b.

pepsin

c.

mucus

d.

bile

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Digestion begins in the stomach.

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Proteins that help in speeding up a chemical reaction are called ___.

a.

epiglottis

b.

enzymes

c.

lipids

d.

saliva

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How many layers of smooth muscle help with churning food in the stomach?

a.

one

b.

two

c.

three

d.

four

Please select the best answer from the choices provided

 

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