38. How do the properties of the digestive tract depend on the type of mouth? 39
ID: 214424 • Letter: 3
Question
38. How do the properties of the digestive tract depend on the type of mouth? 39. Explain how the basic formula describing the factors (area, distance, concentration gradient) that control uptake of oxvgen into the lungs really applies to the design of not only the lungs, but also our intestines, our transport systems, nutrient uptake in plants, C02 uptake in plants, etc? 40. How does sugar and water transport in plants differ? 41. Why do our stomach and small intestines have digestive enzymes that need to be activated before they can be used? 42. You should be able to explain how digestion in animals, nutrition in plants, transport, gas exchange, reproduction, and defense are all related to energy collection and use by plants and animals.Explanation / Answer
Answer to first question (number 38):
Mouth is the first organ where the process of digestion starts. It houses teeth, tongue and salivary glands for mechanical and chemical digestion.
Teeth chews, grinds and tears food into smaller pieces.
The tongue consists of voluntary skeletal muscles that move the food around the mouth enabling efficient mechanical digestion.
The salivary glands produce saliva which helps to moisten food and begins the chemical digestion of carbohydrates (salivary amylase converts starch to maltose). Saliva lubricates food as it passes through the mouth, pharynx, and esophagus allowing easier swallowing.
Conclusion: Oral cavity of mouth allows the food to enter the body followed by mechanical digestion (physical breaking). It marks the start of the digestion, and other parts of digestive tract follow the treatment of partially digested food for complete digestion. Mechanical digestion in mouth help relieve the burden on other organs of digestive tract. So based on the type of mouth and its function, the properties/functions of digestive tract affected.
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