The esophagus is a structure that a. produces and releases ...

[cdr_15]

The esophagus is a structure that
 
  a. produces and releases digestive enzymes but not hormones.
  b. does not produce digestive enzymes but does release hormones.
  c. does not produce or release digestive en-zymes or hormones.
  d. produces only small amounts of digestive enzymes or hormones.

Question 2

Many people throughout the world are practicing vegetarians. Those who are pure vegans are at risk for nutritional deficiencies because they do not eat natural food sources of specific nutrients.
 
  One problem with a pure vegan diet is that it does not include any natural food sources of what? A) Iron B) Zinc C) Vitamin B12 D) Calcium

[yuyiding]

Answer to Question 1

C
The esophagus does not produce or release digestive enzymes or hormones. It simply transports food boluses from the mouth to the stomach.

Answer to Question 2

C
Feedback:
Pure vegans do not eat any natural food sources of vitamin B12 . This is of concern for vegans because vitamin B12 does not occur naturally in plants; it is naturally found only in animals. Iron, zinc, and calcium can be found in various quantities in a pure vegan diet.