The absorptive surface of the small intestine is greater than that of other human digestive organs because of its length and the presence of

A. alveoli

B. neurons

C. villi

D. nephrons

Answer Explanation:

C) villi

- Correct: The absorptive surface of the small intestine is greatly increased due to the presence of villi. Villi are finger-like projections that line the inner surface of the small intestine. These structures greatly increase the surface area available for absorption. Each villus contains capillaries and lacteals (lymphatic vessels) that absorb nutrients from digested food. The large surface area provided by the villi allows for more efficient absorption of nutrients such as carbohydrates, proteins, fats, vitamins, and minerals.

A) alveoli

- Incorrect: Alveoli are tiny air sacs in the lungs where gas exchange occurs during respiration. They are not found in the digestive system and do not contribute to the absorptive surface of the small intestine.

B) neurons

- Incorrect: Neurons are nerve cells that transmit signals throughout the body, including the digestive system. While neurons play a role in regulating digestion and other digestive processes, they do not directly contribute to the absorptive surface of the small intestine.

D) nephrons

- Incorrect: Nephrons are the functional units of the kidneys responsible for filtering blood and producing urine. They are not part of the digestive system and do not contribute to the absorptive surface of the small intestine.

Therefore, the Correct Answer is C.

Q #1: Salmonella bacteria can cause humans to have stomach cramps, vomiting, diarrhea, and fever. The effect these bacteria have on humans indicates that Salmonella bacteria are

A. predators

B. pathogenic organisms

C. parasitic fungi

D. decomposers

Answer Explanation

B) pathogenic organisms

- Correct: Salmonella bacteria are pathogenic organisms, meaning they can cause disease in humans and other animals. When ingested, Salmonella bacteria can lead to symptoms such as stomach cramps, vomiting, diarrhea, and fever. Salmonella infection, known as salmonellosis, is a common cause of foodborne illness, often associated with the consumption of contaminated food, particularly undercooked poultry, eggs, and unpasteurized dairy products.

A) predators

- Incorrect: Predators are organisms that hunt, kill, and consume other organisms for food. Salmonella bacteria are not predators; they do not actively hunt and consume other organisms.

C) parasitic fungi

- Incorrect: Salmonella bacteria are not parasitic fungi. Parasitic fungi are fungi that derive nutrients from living organisms, often causing harm or disease. Salmonella bacteria are a distinct type of pathogenic bacteria, not fungi.

D) decomposers

- Incorrect: Decomposers are organisms that break down and feed on dead organic matter, aiding in the process of decomposition. Salmonella bacteria are not decomposers; they are pathogenic bacteria that can cause illness in humans and animals.
Q #2: Base your answer to the following question on the diagram below. A digestive function of organ C is the synthesis and secretion of

A. salivary amylase

B. protease

C. hydrochloric acid

D. bile

Answer Explanation

Protease enzymes are responsible for breaking down proteins in our food into amino acids. Then different enzymes join amino acids together to form new proteins needed by the body for growth and repair. Protease enzymes are produced in pancreas.
Q #3: What occurs during the digestion of proteins?

A. Specific enzymes break down proteins into amino acids.

B. Specific hormones break down proteins into simple sugars.

C. Specific hormones break down proteins into complex starches.

D. Specific enzymes break down proteins into simple sugars.

Answer Explanation

A) Specific enzymes break down proteins into amino acids.

- Correct: This is the correct answer. Proteins are broken down into their constituent amino acids by specific enzymes during the process of digestion. Enzymes like pepsin in the stomach and various proteases in the small intestine facilitate this breakdown.

B) Specific hormones break down proteins into simple sugars.

- Incorrect: Hormones are not directly involved in breaking down proteins into simple sugars. Hormones are signaling molecules that regulate various processes in the body, including metabolism, but they don't directly participate in the breakdown of proteins into sugars.

C) Specific hormones break down proteins into complex starches.

- Incorrect: Hormones do not break down proteins into complex starches. Proteins are broken down into amino acids by enzymes, not hormones. Starches are complex carbohydrates and are broken down into simple sugars by enzymes like amylase, not proteins.

D) Specific enzymes break down proteins into simple sugars.

- Incorrect: Proteins are not broken down into simple sugars. They are broken down into amino acids by specific enzymes. Simple sugars come from the breakdown of carbohydrates, not proteins.

Free Access on TEAS 7 Exams and Study Notes

Access to all TEAS 7 Exams
Performance Tracking and Analysis
Well Documented and Explained Questions and Answers
2000+ Questions and Correct Answers: Answers Well Explained
Libary of Detailed StudyNotes
Topical Questions and Answers on Examinable topics

Join Now

The absorptive surface of the small intestine is greater than that of other human digestive organs because of its length and the presence of

More Questions on TEAS 7 Science

Q #1: Salmonella bacteria can cause humans to have stomach cramps, vomiting, diarrhea, and fever. The effect these bacteria have on humans indicates that Salmonella bacteria are

Answer Explanation

Q #2: Base your answer to the following question on the diagram below. A digestive function of organ C is the synthesis and secretion of

Answer Explanation

Q #3: What occurs during the digestion of proteins?

Answer Explanation

Free Access on TEAS 7 Exams and Study Notes

TEAS 7 Exams (Q&A)

TEAS 7 Study Notes

TEAS 7 Topical Tests

TEAS 7 Study Guides

Quick Links

Refer a Friend