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 The graph below shows the effect of envi...

The graph below shows the effect of environmental temperature on a girl's skin temperature and on her internal body temperature. Which statement best describes what happens as environmental temperature increases from 20ºC to 30ºC?

A. Both the internal and the skin temperatures reach 40ºC.

B. Both the internal and the skin temperatures increase by about 7ºC.

C. The skin temperature decreases to about 30ºC.

D. The internal temperature increases by about 1ºC.

Answer Explanation:

D) The internal temperature increases by about 1ºC.

- Correct: As environmental temperature increases from 20ºC to 30ºC, the body's internal temperature tends to increase slightly. This is due to the body's thermoregulatory mechanisms, which work to maintain a relatively constant internal temperature (around 37ºC or 98.6ºF) despite fluctuations in environmental temperature. When the environmental temperature rises, the body responds by increasing blood flow to the skin and by initiating mechanisms such as sweating to dissipate heat and maintain thermal equilibrium. However, the increase in environmental temperature may result in a slight increase in internal temperature, typically by about 1ºC, as the body works to dissipate excess heat.

A) Both the internal and the skin temperatures reach 40ºC.

- Incorrect: A 10ºC increase in environmental temperature from 20ºC to 30ºC is not likely to cause both internal and skin temperatures to reach 40ºC. Such a significant increase would likely lead to heatstroke or hyperthermia, which can be life-threatening.

B) Both the internal and the skin temperatures increase by about 7ºC.

- Incorrect: A 10ºC increase in environmental temperature is not likely to cause both internal and skin temperatures to increase by about 7ºC. Such a large increase in temperature would be excessive and would likely lead to severe heat-related illnesses.

C) The skin temperature decreases to about 30ºC.

- Incorrect: In response to an increase in environmental temperature, the body typically increases blood flow to the skin and initiates mechanisms such as sweating to dissipate heat. This would not result in a decrease in skin temperature to match the environmental temperature of 30ºC.

Therefore, the Correct Answer is D.

More Questions on TEAS 7 Science

  • Q #1: Which of these organs is not considered an accessory digestive structure?

    A. mouth

    B. salivary glands

    C. pancreas

    D. liver

    Answer Explanation

    a) mouth

    - Correct: The mouth is not considered an accessory digestive structure; it is an integral part of the alimentary canal (digestive tract). The mouth is where the process of digestion begins, as food is ingested, chewed, and mixed with saliva. Saliva, produced by the salivary glands, contains enzymes (such as amylase) that initiate the breakdown of carbohydrates. Once food is sufficiently broken down in the mouth, it is formed into a bolus and swallowed, entering the esophagus and continuing its journey through the digestive system.

    b) salivary glands

    - Incorrect: Salivary glands are accessory digestive structures that secrete saliva into the mouth. Saliva contains enzymes and lubricants that aid in the mechanical and chemical digestion of food.

    c) pancreas

    - Incorrect: The pancreas is an accessory digestive structure that plays a crucial role in digestion by producing and secreting digestive enzymes into the small intestine. These enzymes aid in the breakdown of carbohydrates, proteins, and fats.

    d) liver

    - Incorrect: The liver is also an accessory digestive structure that contributes to digestion by producing bile, which is stored in the gallbladder and released into the small intestine to aid in the emulsification and digestion of fats. Additionally, the liver plays a role in processing nutrients absorbed from the small intestine and regulating glucose metabolism.

  • Q #2: Most of the nutrient absorption along the alimentary canal occurs in the

    A. ascending colon

    B. stomach

    C. jejunum

    D. ileum

    Answer Explanation

    C. jejunum

    - Correct: Most of the nutrient absorption along the alimentary canal occurs in the jejunum, which is the middle segment of the small intestine. The jejunum has a highly folded inner surface covered with finger-like projections called villi and even smaller microvilli. These structures greatly increase the surface area available for absorption. The epithelial cells lining the villi contain numerous transport proteins and enzymes responsible for absorbing nutrients such as carbohydrates, proteins, fats, vitamins, and minerals into the bloodstream for distribution to the body's cells.

    A. ascending colon

    - Incorrect: The ascending colon is part of the large intestine (colon) where water and electrolytes are primarily absorbed, but it is not a major site of nutrient absorption.

    B. stomach

    - Incorrect: While some substances, such as water, electrolytes, alcohol, and certain drugs, can be absorbed in small amounts in the stomach, the stomach is not a major site of nutrient absorption. Its main function is to begin the digestion of proteins and store food temporarily.

    D. ileum

    - Incorrect: The ileum is the final segment of the small intestine, and while it does participate in nutrient absorption, the majority of nutrient absorption occurs in the jejunum, which precedes the ileum along the alimentary canal. The ileum primarily absorbs bile salts, vitamin B12, and some remaining nutrients not absorbed in the jejunum.

  • Q #3: 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.

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