Answer:
Along the membrane we can find receptors.
Explanation:
Answer:
When the lower esophageal sphincter is atrophied, a disease called achalasia occurs, in which there is no relaxation of the esophagus when the food is swallowed, it is difficult for the food to go down to the stomach. Some symptoms are that the food, once swallowed, can not pass and gets stuck.
Regurgitation, chest pain and weight reduction may also occur.
<span>Sperm are the only human cells to have flagella.</span>
Answer:
mechanical weathering:
ice wedging: does not change rocks composition: abrasion
chemical weathering:
oxidation: changes rocks composition: acid rain
