/*! This file is auto-generated */ .wp-block-button__link{color:#fff;background-color:#32373c;border-radius:9999px;box-shadow:none;text-decoration:none;padding:calc(.667em + 2px) calc(1.333em + 2px);font-size:1.125em}.wp-block-file__button{background:#32373c;color:#fff;text-decoration:none} Problem 27 Not all organs involved in proce... [FREE SOLUTION] | 91影视

91影视

Log out

Learning Materials

Features

Discover

Chapter 25: Problem 27

Not all organs involved in processing food are involved in digestion. Which of the following organs is not involved in digestion? a. mouth b. anus c. stomach d. small intestine

Short Answer

Expert verified
b. anus

Step by step solution

01

Identify Organs Involved in Digestion

List each organ and determine if it participates in breaking down food into nutrients. Digestion involves the breakdown of food in the mouth, stomach, and small intestine.
02

Analyze Each Option

Consider each option provided: mouth, anus, stomach, and small intestine. Determine if each one is directly responsible for breaking down food.
03

Consider Option A: Mouth

The mouth starts the digestion process by chewing food and mixing it with saliva. Therefore, it is involved in digestion.
04

Consider Option B: Anus

The anus is the opening at the end of the digestive tract through which waste leaves the body. It does not play a role in the chemical or mechanical breakdown of food.
05

Consider Option C: Stomach

The stomach continues the digestion process by secreting acid and enzymes to break down food into a semi-liquid form. Thus, it is involved in digestion.
06

Consider Option D: Small Intestine

The small intestine is where most nutrients from the food are absorbed after digestion. Enzymes continue to break down food here, making it a crucial digestion organ.
07

Conclusion

From the analysis, the mouth, stomach, and small intestine are all involved in digestion. The anus, however, is not involved in digestion but rather in the excretion of waste.

Unlock Step-by-Step Solutions & Ace Your Exams!

  • Full Textbook Solutions

    Get detailed explanations and key concepts

  • Unlimited Al creation

    Al flashcards, explanations, exams and more...

  • Ads-free access

    To over 500 millions flashcards

  • Money-back guarantee

    We refund you if you fail your exam.

Over 30 million students worldwide already upgrade their learning with 91影视!

Key Concepts

These are the key concepts you need to understand to accurately answer the question.

digestive system
The digestive system is like a factory that turns the food we eat into the energy and nutrients our body needs. It is made up of several organs that work together to mix, break down, and absorb food.
Let鈥檚 look at the main parts:
  • The mouth is where digestion starts. It uses teeth to chew food and saliva to begin breaking it down.
  • The esophagus is a tube that connects the mouth to the stomach. It moves food using muscle movements.
  • The stomach is a powerful organ filled with acids and enzymes that turn food into a semi-liquid form.
  • The small intestine continues breaking down food and is where most nutrient absorption occurs.
  • The large intestine absorbs water and forms waste, which then moves to the rectum and anus for excretion.
Each organ has a special role, making digestion a smooth and effective process.
food breakdown
Breaking down food is a two-part process: mechanical and chemical.
In mechanical digestion, physical actions like chewing and stomach churning occur.
  • Chemical digestion involves enzymes and acids breaking food into nutrients.
  • In the mouth, enzymes in saliva start breaking down carbs.
  • In the stomach, acids and enzymes work on proteins.
These processes ensure that food is broken into small enough pieces for our body to use.
The result: nutrients our body needs and waste that needs to be excreted. Whether it鈥檚 chewing in the mouth or enzymes in the stomach, each step is crucial.
digestion process
The digestion process can be complex, but let鈥檚 break it down simply:
  • It starts in the mouth with chewing and saliva.
  • Swallowed food moves through the esophagus to the stomach.
  • In the stomach, food is turned into a semi-liquid mixture by stomach acids and enzymes.
  • This mixture enters the small intestine, where enzymes from the pancreas and bile from the liver help further break it down.
  • Throughout the small intestine, nutrients are absorbed into the bloodstream.
The remaining waste moves to the large intestine where water is absorbed, and the leftover material is excreted through the anus.
It's a systematic and efficient process designed to keep us nourished and energized.
nutrient absorption
Nutrient absorption mainly happens in the small intestine.
The inside of the small intestine has many folds and tiny finger-like projections called villi. These increase the surface area, making the absorption process more efficient.
  • Each villus has tiny blood vessels where nutrients enter the bloodstream.
  • Different nutrients are absorbed in different parts of the small intestine.
  • For example, carbohydrates and proteins are usually absorbed in the upper part, while fats and bile acids are absorbed in the lower part.
Once nutrients enter the bloodstream, they are transported to various cells in the body to be used for energy, growth, and repair.
This efficient absorption ensures that our body gets maximum benefit from the food we consume.

One App. One Place for Learning.

All the tools & learning materials you need for study success - in one app.

Get started for free

Most popular questions from this chapter

How does the liver assist in fat digestion? a. produces bicarbonate b. concentrates bile salts c. produces bile d. produces pepsin

An experiment to measure the rate of respiration in mice at \(10^{\circ} C\) and \(25^{\circ} \mathrm{C}\) was performed using a respirometer, an apparatus that measures changes in gas volume. Respiration was measured in mL of \(O_{2}\) consumed per gram of organism over several five-minute trials, and the following data were obtained. $$\begin{array}{|c|c|}\hline \text { Organism } & {\text { Temperature \(\left(^{\circ} \mathrm{C}\right)\) }} & {\text { Average respiration \(\left(\mathrm{mL} 0_{2} / \mathrm{g} / \mathrm{min}\right)\) }} \\ \hline \text { Mouse } & {10} & {0.0518} \\ \hline \text { Mouse } & {25} & {0.0321} \\\ \hline\end{array}$$ According to these data, mice at 10掳C demonstratedgreater oxygen consumption per gram of tissue than mice at \(25^{\circ} C.\) Which of the following statements best explains the observation? a. The mice at 10掳C had a higher rate of ATP production than the mice at 25掳C. b. The mice at 10掳C had a lower metabolic rate than the mice at 25掳C. c. The mice at 25掳C weighed less than the mice at 10掳C. d. The mice at 25掳C were more active than the mice at 10掳C.

How do ingestion and digestion differ? a. Ingestion is taking food in through mouth, where mechanical digestion begins. Chemical digestion begins in the stomach, where food is further broken down into smaller molecules that can be absorbed and used by the body. b. Ingestion is the process of taking in food through the mouth, where mechanical and chemical digestion begins to break down the food into smaller molecules that can be absorbed and used by the body. c. Ingestion is taking food in through the mouth, where mechanical and chemical digestion begins. Digestion in the stomach breaks down proteins and fats present in food into smaller molecules that can be absorbed and used by the body. d. Ingestion is the transfer of food from the mouth to the esophagus, where mechanical and chemical digestion begin to break down the food into smaller molecules that can be absorbed and used by the body.

Explain how villi and microvilli aid in absorption. a. Villi and microvilli increase the surface area of the small intestines, which aids in the absorption of bile salts and vitamin B12. b. Villi and microvilli increase the surface area of the small intestine, which increases the absorption of nutrients by diffusion. c. Villi and microvilli form the inner layer of epithelial tissue in the small intestine and increase the absorption of nutrients from chyme. d. Villi and microvilli absorb food through the small intestine via smooth muscle contractions called peristalsis.

One of the key features of villi and microvilli in the digestive system is their finger-like projection shape. Which of the following is an example of how the shape of microvilli can enhance nutrient absorption? a. Nutrients can enter the bloodstream through the blood vessels that are located in middle of the microvilli. b. Larger microvilli have more surface area over which more nutrients are absorbed. c. The microvilli projections aid in mechanical digestion of food particles. d. The finger-like projections prevent large particles of food from passing through the digestive system.
See all solutions

Recommended explanations on Biology Textbooks

Plant Biology

Read Explanation

Cell Cycle

Read Explanation

Ecological Levels

Read Explanation

Biological Organisms

Read Explanation

Biology Experiments

Read Explanation

Cell Communication

Read Explanation
View all explanations

What do you think about this solution?

We value your feedback to improve our textbook solutions.

Study anywhere. Anytime. Across all devices.