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Biology of Humans 6th Edition by Judith Goodenough,Betty McGuire
النسخة 6الرقم المعياري الدولي: 978-0134324876Biology of Humans 6th Edition by Judith Goodenough,Betty McGuire
النسخة 6الرقم المعياري الدولي: 978-0134324876 تمرين 3
Why is it is possible to swallow while standing on one's hands
A) Valves in the digestive system keep food from moving backward.
B) Peristalsis pushes food along the digestive tract in the right direction.
C) Bacteria clog the digestive tube and prevent food from moving in the wrong direction.
D) A wave of muscle contraction called emulsification prevents food from moving backward.
A) Valves in the digestive system keep food from moving backward.
B) Peristalsis pushes food along the digestive tract in the right direction.
C) Bacteria clog the digestive tube and prevent food from moving in the wrong direction.
D) A wave of muscle contraction called emulsification prevents food from moving backward.
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There are no valves in the digestive sys...
Biology of Humans 6th Edition by Judith Goodenough,Betty McGuire
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