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TEAS 7 Science Digestive System Practice Exam 1 Bile is a secretion which aids in the di...

Bile is a secretion which aids in the digestion of

A. lipids

B. proteins

C. saccharides

D. starches

Answer Explanation:

A) lipids

- Correct: Bile is a secretion produced by the liver and stored in the gallbladder. It aids in the digestion of lipids (fats) by emulsifying large fat globules into smaller droplets. This process increases the surface area of fats, allowing digestive enzymes such as lipase to more efficiently break them down into smaller molecules (fatty acids and glycerol) that can be absorbed in the small intestine.

B) proteins

- Incorrect: Bile does not aid in the digestion of proteins. Proteins are broken down by specific digestive enzymes such as pepsin in the stomach and proteases in the small intestine.

C) saccharides

- Incorrect: Bile does not aid in the digestion of saccharides, which are carbohydrates. Carbohydrates are broken down by enzymes such as amylase into simple sugars (monosaccharides) during the process of digestion.

D) starches

- Incorrect: Bile does not aid in the digestion of starches. Starches are complex carbohydrates

Therefore, the Correct Answer is A.

More Questions on TEAS 7 Science

  • Q #1: If no carbohydrate ingestion occurs in the body during a 24-hour period, liver activity provides for the body's needs by

    A. emulsification

    B. manufacturing more bile

    C. converting glycogen into glucose

    D. releasing iron

    Answer Explanation

    C) converting glycogen into glucose

    - Correct: When no carbohydrate ingestion occurs in the body during a 24-hour period, the liver can provide for the body's glucose needs by converting stored glycogen into glucose through a process known as glycogenolysis. Glycogen is a polysaccharide that serves as a storage form of glucose in the liver and muscles. When blood glucose levels decrease, such as during fasting or low carbohydrate intake, the liver breaks down glycogen into glucose molecules, which are then released into the bloodstream to maintain blood glucose levels and provide energy to cells throughout the body.

    A) emulsification

    - Incorrect: Emulsification is a process by which bile breaks down large fat globules into smaller droplets to aid in fat digestion in the small intestine. It is not related to the liver's role in glucose metabolism.

    B) manufacturing more bile

    - Incorrect: The liver produces bile continuously, regardless of carbohydrate ingestion. While the liver's production of bile is important for fat digestion and absorption, it is not directly related to glucose metabolism.

    D) releasing iron

    - Incorrect: The liver is involved in storing and regulating iron levels in the body, but releasing iron is not directly related to providing for the body's glucose needs in the absence of carbohydrate ingestion.

  • Q #2: The pancreas is an organ connected to the digestive tract of humans by a duct (tube) through which digestive enzymes flow. Why are these enzymes important to the digestive system?

    A. They form proteins needed in the stomach.

    B. They form the acids that break down food.

    C. They change food substances into molecules that can pass into the bloodstream and cells.

    D. They change food materials into wastes that can be passed out of the body.

    Answer Explanation

    C) They change food substances into molecules that can pass into the bloodstream and cells.

    - Correct: Digestive enzymes secreted by the pancreas play a crucial role in breaking down complex food molecules into smaller, absorbable molecules that can pass through the walls of the small intestine and into the bloodstream. These smaller molecules include carbohydrates broken down into simple sugars, proteins broken down into amino acids, and fats broken down into fatty acids and glycerol. Once these molecules are absorbed into the bloodstream, they can be transported to cells throughout the body to provide energy and support various metabolic processes.

    A) They form proteins needed in the stomach.

    - Incorrect: Digestive enzymes do not form proteins needed in the stomach. Proteins are broken down into amino acids by digestive enzymes, but the enzymes themselves do not form proteins.

    B) They form the acids that break down food.

    - Incorrect: Digestive enzymes do not form acids. Acids such as hydrochloric acid are secreted by the stomach and aid in the breakdown of food, particularly proteins, but they are not formed by pancreatic enzymes.

    D) They change food materials into wastes that can be passed out of the body.

    - Incorrect: While digestive enzymes help break down food materials, their primary function is to convert these materials into absorbable molecules rather than wastes. The conversion of food into waste products occurs primarily through processes in the digestive tract and is facilitated by enzymes as part of digestion, but it is not the direct role of pancreatic enzymes.

  • Q #3: In some regions of the world, children suffer from a protein deficiency known as kwashiorkor. This deficiency occurs when a child's diet is changed from high-protein breast milk to watery cereal. Even though the child is receiving calories, the child becomes sick and less active, and growth ceases. These symptoms are probably due to

    A. too many nucleic acids in the diet

    B. an overconsumption of complete protein foods

    C. not enough carbohydrates in the diet

    D. a lack of essential amino acids in the diet

    Answer Explanation

    D) a lack of essential amino acids in the diet

    - Correct: Kwashiorkor is a form of severe acute malnutrition that occurs due to inadequate protein intake, particularly deficient in essential amino acids. When a child's diet is changed from high-protein breast milk to watery cereal, which is often low in protein and deficient in essential amino acids, the child may develop kwashiorkor despite receiving calories. Essential amino acids are necessary for proper growth, immune function, and overall health. Without an adequate supply of essential amino acids, the body cannot synthesize proteins required for various physiological processes, leading to symptoms such as stunted growth, lethargy, edema (swelling), and weakened immune function, which are characteristic of kwashiorkor.

    A) too many nucleic acids in the diet

    - Incorrect: Kwashiorkor is not caused by an excess of nucleic acids in the diet. Nucleic acids are the building blocks of DNA and RNA and are not directly related to the development of kwashiorkor.

    B) an overconsumption of complete protein foods

    - Incorrect: Kwashiorkor results from a deficiency in protein intake, particularly inadequate consumption of essential amino acids, rather than an overconsumption of complete protein foods.

    C) not enough carbohydrates in the diet

    - Incorrect: While a diet lacking in carbohydrates can lead to energy deficiency, it does not directly cause the symptoms of kwashiorkor. Kwashiorkor is primarily associated with inadequate protein intake, not insufficient carbohydrate intake.

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