The digestion of food and subsequent absorption into the bloodstream is important because

A. absorbed food is toxic to the body

B. absorbed food stimulates reproduction

C. absorbed food is the raw material for metabolism

D. absorbed food aids in respiration

Answer Explanation:

C) absorbed food is the raw material for metabolism

- Correct: The digestion of food and subsequent absorption into the bloodstream are essential processes because absorbed food molecules serve as the raw material for metabolism. Once nutrients from food are absorbed into the bloodstream, they are transported to cells throughout the body where they are used for various metabolic processes. Carbohydrates are broken down into glucose, which is used for energy production. Proteins are broken down into amino acids, which are used for building and repairing tissues, as well as for synthesizing enzymes and hormones. Fats are broken down into fatty acids and glycerol, which are used for energy production and for building cell membranes and certain hormones. Overall, absorbed food molecules provide the necessary energy and building blocks for cellular activities, growth, and maintenance of the body.

A) absorbed food is toxic to the body

- Incorrect: Absorbed food is not inherently toxic to the body. In fact, nutrients obtained from food are essential for the body's survival and proper functioning. However, certain substances in food may be harmful if absorbed in excessive amounts, such as certain vitamins or minerals. Generally, the body has mechanisms to regulate nutrient absorption and maintain homeostasis.

B) absorbed food stimulates reproduction

- Incorrect: While proper nutrition is important for overall health and fertility, absorbed food does not directly stimulate reproduction. Reproduction is regulated by various hormones and physiological processes within the body.

D) absorbed food aids in respiration

- Incorrect: While nutrients obtained from food are used by cells for energy production through respiration, absorbed food itself does not directly aid in respiration. Respiration is a complex physiological process that involves the exchange of gases (oxygen and carbon dioxide) in the lungs and cellular respiration within cells to produce energy.

Therefore, the Correct Answer is C.

Q #1: A source of roughage in the human diet is supplied by certain

A. saturated lipids

B. complete proteins

C. complex carbohydrates

D. nucleic acids

Answer Explanation

C) complex carbohydrates

- Correct: Complex carbohydrates, such as whole grains, legumes, fruits, and vegetables, are sources of roughage in the human diet. Roughage, also known as dietary fiber, refers to the indigestible portion of plant foods that adds bulk to the stool and promotes healthy digestion. Complex carbohydrates contain both soluble and insoluble fiber, which helps regulate bowel movements, prevent constipation, and promote overall digestive health.

A) saturated lipids

- Incorrect: Saturated lipids, commonly found in animal fats and some plant oils, are not sources of roughage. While they are a component of the diet and provide energy, they do not contribute to the fiber content of the diet.

B) complete proteins

- Incorrect: Complete proteins, which contain all essential amino acids, are not sources of roughage. Proteins are important for building and repairing tissues, as well as for various physiological functions, but they do not provide dietary fiber.

D) nucleic acids

- Incorrect: Nucleic acids, such as DNA and RNA, are not sources of roughage. They are essential molecules involved in genetic information transfer and protein synthesis but are not related to the fiber content of the diet.
Q #2: Which foods should be included in a balanced diet as a good source of roughage?

A. red meat and poultry

B. fresh fruits and vegetables

C. eggs and milk products

D. animal fat and plant oil

Answer Explanation

B) fresh fruits and vegetables

- Correct: Fresh fruits and vegetables are excellent sources of roughage, also known as dietary fiber. These foods provide insoluble fiber, soluble fiber, or a combination of both, which adds bulk to the stool and promotes healthy digestion. Insoluble fiber, found in foods like leafy greens, celery, and broccoli, helps to move food through the digestive tract, preventing constipation. Soluble fiber, found in foods like apples, oats, and beans, can help lower cholesterol levels and regulate blood sugar levels.

A) red meat and poultry

- Incorrect: While red meat and poultry are good sources of protein and other nutrients, they are not significant sources of dietary fiber or roughage. These foods do not contribute to the fiber content of the diet.

C) eggs and milk products

- Incorrect: Eggs and milk products are valuable sources of protein, vitamins, and minerals, but they are not significant sources of dietary fiber or roughage. These foods do not provide the fiber needed for healthy digestion.

D) animal fat and plant oil

- Incorrect: Animal fat and plant oils are sources of dietary fat, which is important for providing energy and essential fatty acids in the diet. However, they do not contain significant amounts of dietary fiber or roughage. These foods do not contribute to the fiber content of the diet.
Q #3: Which structures secrete chemicals utilized for the completion of digestion within the small intestine?

A. liver and pancreas

B. glomerulus and villi

C. esophagus and alveoli

D. gallbladder and pharynx

Answer Explanation

A) liver and pancreas

- Correct: The liver and pancreas both secrete chemicals that are utilized for the completion of digestion within the small intestine. The liver produces bile, which is stored in the gallbladder and released into the small intestine to aid in the emulsification and digestion of fats. The pancreas secretes pancreatic enzymes (such as amylase, lipase, and proteases) into the small intestine to further break down carbohydrates, fats, and proteins into smaller molecules that can be absorbed.

B) glomerulus and villi

- Incorrect: The glomerulus is a part of the kidney involved in the filtration of blood, and villi are finger-like projections in the small intestine that increase surface area for absorption. While villi play a role in absorption within the small intestine, they do not secrete chemicals for digestion. The glomerulus is not involved in digestion.

C) esophagus and alveoli

- Incorrect: The esophagus is involved in swallowing and does not secrete chemicals for digestion. Alveoli are air sacs in the lungs where gas exchange occurs during respiration and are not involved in digestion.

D) gallbladder and pharynx

- Incorrect: The gallbladder stores bile produced by the liver but does not secrete chemicals directly into the small intestine. The pharynx is involved in swallowing and does not secrete chemicals for digestion.

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The digestion of food and subsequent absorption into the bloodstream is important because

More Questions on TEAS 7 Science

Q #1: A source of roughage in the human diet is supplied by certain

Answer Explanation

Q #2: Which foods should be included in a balanced diet as a good source of roughage?

Answer Explanation

Q #3: Which structures secrete chemicals utilized for the completion of digestion within the small intestine?

Answer Explanation

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