In humans, structures that release digestive secretions directly into the small intestine include both the

A. salivary glands and the pancreas

B. gall bladder and the lacteals

C. villi and the salivary glands

D. pancreas and the gall bladder

Answer Explanation:

D) pancreas and the gallbladder

- Correct: Both the pancreas and the gallbladder release digestive secretions directly into the small intestine. The pancreas secretes pancreatic enzymes (such as amylase, lipase, and proteases) into the small intestine to aid in the digestion of carbohydrates, fats, and proteins. The gallbladder stores bile produced by the liver, which is released into the small intestine to aid in the emulsification and digestion of fats.

A) salivary glands and the pancreas

- Incorrect: While the pancreas releases digestive secretions directly into the small intestine, the salivary glands secrete saliva into the mouth, which contains enzymes (such as amylase) that begin the digestion of carbohydrates. Salivary glands do not release digestive secretions directly into the small intestine.

B) gall bladder and the lacteals

- Incorrect: The gallbladder stores bile produced by the liver, which is released into the small intestine to aid in fat digestion. Lacteals are lymphatic vessels found in the villi of the small intestine and are involved in the absorption of fats, but they do not release digestive secretions directly into the small intestine.

C) villi and the salivary glands

- Incorrect: Villi are finger-like projections in the small intestine that increase the surface area for absorption of nutrients but do not release digestive secretions directly into the small intestine. Salivary glands secrete saliva into the mouth to initiate the digestion of carbohydrates but do not release digestive secretions directly into the small intestine.

Therefore, the Correct Answer is D.

Q #1: Base your answer to the following question on the diagram below of some human digestive organs and on your knowledge of biology. Which organ synthesizes both urea and bile?

A. A

B. E

C. C

D. D

Answer Explanation

The organ that synthesizes both urea and bile is the liver (E).

The liver plays a crucial role in metabolism and detoxification in the body. It synthesizes urea as a waste product of protein metabolism through the process of the urea cycle. Urea is then excreted by the kidneys in urine.

Additionally, the liver produces bile, a substance that aids in the digestion and absorption of fats. Bile is synthesized in hepatocytes (liver cells) and then stored and concentrated in the gallbladder before being released into the small intestine to emulsify fats.
Q #2: A branch of the nerve regulating the secretions of the stomach can be cut surgically. The decrease in hydrochloric acid secretion that would result from this procedure would be most helpful to an individual with

A. diarrhea

B. appendicitis

C. gallstones

D. ulcers

Answer Explanation

D) ulcers

- Correct: The decrease in hydrochloric acid secretion resulting from the surgical cutting of a branch of the nerve regulating stomach secretions would be most helpful to an individual with ulcers. Ulcers are sores or lesions that develop in the lining of the stomach, small intestine, or esophagus due to factors such as infection with Helicobacter pylori bacteria, prolonged use of nonsteroidal anti-inflammatory drugs (NSAIDs), or excessive alcohol consumption. Hydrochloric acid plays a significant role in the formation and exacerbation of ulcers by increasing the acidity of the stomach, which can irritate and erode the lining of the gastrointestinal tract. Therefore, reducing hydrochloric acid secretion can help alleviate the symptoms and promote healing of ulcers.

A) diarrhea

- Incorrect: Decreasing hydrochloric acid secretion would not directly address the underlying causes of diarrhea, which may be related to infections, dietary issues, or other factors affecting gastrointestinal motility and water absorption.

B) appendicitis

- Incorrect: Appendicitis is inflammation of the appendix, a small pouch located near the junction of the small and large intestines. Decreasing hydrochloric acid secretion would not directly affect the development or treatment of appendicitis.

C) gallstones

- Incorrect: Gallstones are hardened deposits that form in the gallbladder and can obstruct the flow of bile. Decreasing hydrochloric acid secretion would not directly address the formation or treatment of gallstones, as they are primarily composed of cholesterol or bilirubin, not affected by changes in stomach acid levels.
Q #3: Which process is represented by the diagram below?

A. emulsification

B. excretion

C. absorption

D. peristalsis

Answer Explanation

Emulsification is a process by which large fat globules are broken down into smaller droplets. This process is facilitated by substances called emulsifiers, with bile being one of the most common emulsifiers in the human body.

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In humans, structures that release digestive secretions directly into the small intestine include both the

More Questions on TEAS 7 Science

Q #1: Base your answer to the following question on the diagram below of some human digestive organs and on your knowledge of biology. Which organ synthesizes both urea and bile?

Answer Explanation

Q #2: A branch of the nerve regulating the secretions of the stomach can be cut surgically. The decrease in hydrochloric acid secretion that would result from this procedure would be most helpful to an individual with

Answer Explanation

Q #3: Which process is represented by the diagram below?

Answer Explanation

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