All Tests Available for Free.

info@examgates.com

support@examgates.com

info@examgates.com

support@examgates.com

/
TEAS 7 Science Digestive System Practice Exam 2 During gastric emptying, chyme is releas...

During gastric emptying, chyme is released into the duodenum through the ________.

A. esophageal hiatus

B. pyloric antrum

C. pyloric canal

D. pyloric sphincter

Answer Explanation:

c) pyloric sphincter

- Correct: During gastric emptying, chyme (partially digested food) is released from the stomach into the duodenum through the pyloric sphincter. The pyloric sphincter is a muscular valve located at the junction between the stomach and the duodenum. It regulates the passage of chyme from the stomach into the small intestine, allowing for controlled release and preventing backflow of intestinal contents into the stomach.

a) pyloric antrum

- Incorrect: The pyloric antrum is the lower portion of the stomach that leads into the pyloric canal. It is involved in mixing and churning food, but it does not regulate the release of chyme into the duodenum.

b) pyloric canal

- Incorrect: The pyloric canal is the narrow portion of the stomach that connects the pyloric antrum to the pyloric sphincter. It is involved in directing chyme toward the pyloric sphincter for release into the duodenum, but it is not the site of chyme release itself.

The esophageal hiatus is an opening in the diaphragm through which the esophagus passes as it descends from the thoracic cavity into the abdominal cavity. It is not directly involved in gastric emptying.

Therefore, the Correct Answer is C.

More Questions on TEAS 7 Science

  • Q #1: Which human excretory organ breaks down red blood cells and synthesizes urea?

    A. lung

    B. kidney

    C. skin

    D. liver

    Answer Explanation

    D) liver

    - Correct: The liver is the human excretory organ that breaks down red blood cells and synthesizes urea. Red blood cells have a finite lifespan and are continually replaced by new cells produced in the bone marrow. When old or damaged red blood cells are removed from circulation, their components are broken down by macrophages, primarily in the spleen and liver. The liver plays a crucial role in this process by breaking down hemoglobin, the oxygen-carrying protein in red blood cells, into heme and globin. Heme is further broken down into bilirubin, which is excreted in bile and eventually eliminated from the body in feces. Additionally, the liver synthesizes urea as a waste product of protein metabolism, which is excreted by the kidneys in urine.

    A) lung

    - Incorrect: While the lungs play a role in the excretion of carbon dioxide during respiration, they are not involved in breaking down red blood cells or synthesizing urea.

    B) kidney

    - Incorrect: The kidneys are responsible for filtering blood to remove waste products and excess substances, such as urea, creatinine, and electrolytes, to produce urine. While the kidneys excrete urea synthesized by the liver, they do not break down red blood cells.

    C) skin

    - Incorrect: The skin is involved in excreting certain waste products, such as sweat (containing water, electrolytes, and small amounts of urea and other metabolic waste), but it does not break down red blood cells or synthesize urea.

  • Q #2: What is the role of the small intestine’s MALT?

    A. secreting mucus

    B. buffering acidic chyme

    C. activating pepsin

    D. preventing bacteria from entering the bloodstream

    Answer Explanation

    b) buffering acidic chyme

    - Correct: MALT (Mucosa-Associated Lymphoid Tissue) in the small intestine plays a role in buffering acidic chyme. MALT contains immune cells, such as lymphocytes and plasma cells, that help protect the intestinal mucosa from pathogens and foreign substances. Additionally, MALT helps regulate the pH of the intestinal contents by neutralizing acidic chyme, which is important for optimal enzymatic activity and absorption in the small intestine.

    a) secreting mucus

    - Incorrect: The secretion of mucus is primarily the role of goblet cells, which are scattered throughout the epithelium of the small intestine. Mucus serves to lubricate and protect the intestinal epithelium from mechanical damage and chemical irritation.

    c) activating pepsin

    - Incorrect: Pepsin is an enzyme involved in protein digestion, and its activation primarily occurs in the stomach under acidic conditions. It is produced as pepsinogen by chief cells in the gastric glands and is activated by hydrochloric acid (HCl) secreted by parietal cells.

    d) preventing bacteria from entering the bloodstream

    - Incorrect: While MALT helps protect the intestinal mucosa from pathogens and foreign substances, its primary role is not to prevent bacteria from entering the bloodstream. Instead, MALT functions in the local immune defense of the mucosal surface of the intestine, including the initiation of immune responses against pathogens encountered in the gastrointestinal tract.

  • Q #3: Which phase of deglutition involves contraction of the longitudinal muscle layer of the muscularis?

    A. voluntary phase

    B. buccal phase

    C. pharyngeal phase

    D. esophageal phase

    Answer Explanation

    a) voluntary phase

    - Correct: The voluntary phase of deglutition (swallowing) involves the initial voluntary movement of food from the mouth into the pharynx. During this phase, the tongue pushes the food bolus backward toward the oropharynx. Contraction of the longitudinal muscle layer of the muscularis propels the food bolus into the pharynx, which is part of the voluntary control of swallowing.

    b) buccal phase

    - Incorrect: The buccal phase of deglutition involves the initial formation of the food bolus and its movement toward the oropharynx by the coordinated action of the tongue and muscles of the cheeks. It does not involve contraction of the longitudinal muscle layer of the muscularis.

    c) pharyngeal phase

    - Incorrect: The pharyngeal phase of deglutition is involuntary and occurs when the food bolus reaches the pharynx. It involves the sequential contraction of muscles in the pharyngeal wall to propel the food bolus downward toward the esophagus. The contraction of the longitudinal muscle layer of the muscularis is not a significant component of the pharyngeal phase.

    d) esophageal phase

    - Incorrect: The esophageal phase of deglutition involves the passage of the food bolus through the esophagus and into the stomach. Peristaltic waves of contraction and relaxation of the muscularis propels the food bolus along the length of the esophagus. The contraction of the longitudinal muscle layer of the muscularis primarily occurs during the voluntary phase of deglutition, not the esophageal phase.

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

TEAS 7 Exams (Q&A)

TEAS 7 Study Notes

TEAS 7 Topical Tests

examgates

TEAS 7 Study Guides

Quick Links

Refer a Friend

Refer a friend and claim free unlimited access

Shape
Terms of Service Privacy Policy Sitemap Security

© 2025 ExamGates Made with by ExamGates