• Critical Thinking Questions
  • Introduction
  • 1.1 Overview of Anatomy and Physiology
  • 1.2 Structural Organization of the Human Body
  • 1.3 Functions of Human Life
  • 1.4 Requirements for Human Life
  • 1.5 Homeostasis
  • 1.6 Anatomical Terminology
  • 1.7 Medical Imaging
  • Chapter Review
  • Interactive Link Questions
  • Review Questions
  • 2.1 Elements and Atoms: The Building Blocks of Matter
  • 2.2 Chemical Bonds
  • 2.3 Chemical Reactions
  • 2.4 Inorganic Compounds Essential to Human Functioning
  • 2.5 Organic Compounds Essential to Human Functioning
  • 3.1 The Cell Membrane
  • 3.2 The Cytoplasm and Cellular Organelles
  • 3.3 The Nucleus and DNA Replication
  • 3.4 Protein Synthesis
  • 3.5 Cell Growth and Division
  • 3.6 Cellular Differentiation
  • 4.1 Types of Tissues
  • 4.2 Epithelial Tissue
  • 4.3 Connective Tissue Supports and Protects
  • 4.4 Muscle Tissue and Motion
  • 4.5 Nervous Tissue Mediates Perception and Response
  • 4.6 Tissue Injury and Aging
  • 5.1 Layers of the Skin
  • 5.2 Accessory Structures of the Skin
  • 5.3 Functions of the Integumentary System
  • 5.4 Diseases, Disorders, and Injuries of the Integumentary System
  • 6.1 The Functions of the Skeletal System
  • 6.2 Bone Classification
  • 6.3 Bone Structure
  • 6.4 Bone Formation and Development
  • 6.5 Fractures: Bone Repair
  • 6.6 Exercise, Nutrition, Hormones, and Bone Tissue
  • 6.7 Calcium Homeostasis: Interactions of the Skeletal System and Other Organ Systems
  • 7.1 Divisions of the Skeletal System
  • 7.2 The Skull
  • 7.3 The Vertebral Column
  • 7.4 The Thoracic Cage
  • 7.5 Embryonic Development of the Axial Skeleton
  • 8.1 The Pectoral Girdle
  • 8.2 Bones of the Upper Limb
  • 8.3 The Pelvic Girdle and Pelvis
  • 8.4 Bones of the Lower Limb
  • 8.5 Development of the Appendicular Skeleton
  • 9.1 Classification of Joints
  • 9.2 Fibrous Joints
  • 9.3 Cartilaginous Joints
  • 9.4 Synovial Joints
  • 9.5 Types of Body Movements
  • 9.6 Anatomy of Selected Synovial Joints
  • 9.7 Development of Joints
  • 10.1 Overview of Muscle Tissues
  • 10.2 Skeletal Muscle
  • 10.3 Muscle Fiber Contraction and Relaxation
  • 10.4 Nervous System Control of Muscle Tension
  • 10.5 Types of Muscle Fibers
  • 10.6 Exercise and Muscle Performance
  • 10.7 Cardiac Muscle Tissue
  • 10.8 Smooth Muscle
  • 10.9 Development and Regeneration of Muscle Tissue
  • 11.1 Interactions of Skeletal Muscles, Their Fascicle Arrangement, and Their Lever Systems
  • 11.2 Naming Skeletal Muscles
  • 11.3 Axial Muscles of the Head, Neck, and Back
  • 11.4 Axial Muscles of the Abdominal Wall, and Thorax
  • 11.5 Muscles of the Pectoral Girdle and Upper Limbs
  • 11.6 Appendicular Muscles of the Pelvic Girdle and Lower Limbs
  • 12.1 Basic Structure and Function of the Nervous System
  • 12.2 Nervous Tissue
  • 12.3 The Function of Nervous Tissue
  • 12.4 The Action Potential
  • 12.5 Communication Between Neurons
  • 13.1 The Embryologic Perspective
  • 13.2 The Central Nervous System
  • 13.3 Circulation and the Central Nervous System
  • 13.4 The Peripheral Nervous System
  • 14.1 Sensory Perception
  • 14.2 Central Processing
  • 14.3 Motor Responses
  • 15.1 Divisions of the Autonomic Nervous System
  • 15.2 Autonomic Reflexes and Homeostasis
  • 15.3 Central Control
  • 15.4 Drugs that Affect the Autonomic System
  • 16.1 Overview of the Neurological Exam
  • 16.2 The Mental Status Exam
  • 16.3 The Cranial Nerve Exam
  • 16.4 The Sensory and Motor Exams
  • 16.5 The Coordination and Gait Exams
  • 17.1 An Overview of the Endocrine System
  • 17.2 Hormones
  • 17.3 The Pituitary Gland and Hypothalamus
  • 17.4 The Thyroid Gland
  • 17.5 The Parathyroid Glands
  • 17.6 The Adrenal Glands
  • 17.7 The Pineal Gland
  • 17.8 Gonadal and Placental Hormones
  • 17.9 The Endocrine Pancreas
  • 17.10 Organs with Secondary Endocrine Functions
  • 17.11 Development and Aging of the Endocrine System
  • 18.1 An Overview of Blood
  • 18.2 Production of the Formed Elements
  • 18.3 Erythrocytes
  • 18.4 Leukocytes and Platelets
  • 18.5 Hemostasis
  • 18.6 Blood Typing
  • 19.1 Heart Anatomy
  • 19.2 Cardiac Muscle and Electrical Activity
  • 19.3 Cardiac Cycle
  • 19.4 Cardiac Physiology
  • 19.5 Development of the Heart
  • 20.1 Structure and Function of Blood Vessels
  • 20.2 Blood Flow, Blood Pressure, and Resistance
  • 20.3 Capillary Exchange
  • 20.4 Homeostatic Regulation of the Vascular System
  • 20.5 Circulatory Pathways
  • 20.6 Development of Blood Vessels and Fetal Circulation
  • 21.1 Anatomy of the Lymphatic and Immune Systems
  • 21.2 Barrier Defenses and the Innate Immune Response
  • 21.3 The Adaptive Immune Response: T lymphocytes and Their Functional Types
  • 21.4 The Adaptive Immune Response: B-lymphocytes and Antibodies
  • 21.5 The Immune Response against Pathogens
  • 21.6 Diseases Associated with Depressed or Overactive Immune Responses
  • 21.7 Transplantation and Cancer Immunology
  • 22.1 Organs and Structures of the Respiratory System
  • 22.2 The Lungs
  • 22.3 The Process of Breathing
  • 22.4 Gas Exchange
  • 22.5 Transport of Gases
  • 22.6 Modifications in Respiratory Functions
  • 22.7 Embryonic Development of the Respiratory System
  • 23.1 Overview of the Digestive System
  • 23.2 Digestive System Processes and Regulation
  • 23.3 The Mouth, Pharynx, and Esophagus
  • 23.4 The Stomach
  • 23.5 The Small and Large Intestines
  • 23.6 Accessory Organs in Digestion: The Liver, Pancreas, and Gallbladder
  • 23.7 Chemical Digestion and Absorption: A Closer Look
  • 24.1 Overview of Metabolic Reactions
  • 24.2 Carbohydrate Metabolism
  • 24.3 Lipid Metabolism
  • 24.4 Protein Metabolism
  • 24.5 Metabolic States of the Body
  • 24.6 Energy and Heat Balance
  • 24.7 Nutrition and Diet
  • 25.1 Physical Characteristics of Urine
  • 25.2 Gross Anatomy of Urine Transport
  • 25.3 Gross Anatomy of the Kidney
  • 25.4 Microscopic Anatomy of the Kidney
  • 25.5 Physiology of Urine Formation
  • 25.6 Tubular Reabsorption
  • 25.7 Regulation of Renal Blood Flow
  • 25.8 Endocrine Regulation of Kidney Function
  • 25.9 Regulation of Fluid Volume and Composition
  • 25.10 The Urinary System and Homeostasis
  • 26.1 Body Fluids and Fluid Compartments
  • 26.2 Water Balance
  • 26.3 Electrolyte Balance
  • 26.4 Acid-Base Balance
  • 26.5 Disorders of Acid-Base Balance
  • 27.1 Anatomy and Physiology of the Male Reproductive System
  • 27.2 Anatomy and Physiology of the Female Reproductive System
  • 27.3 Development of the Male and Female Reproductive Systems
  • 28.1 Fertilization
  • 28.2 Embryonic Development
  • 28.3 Fetal Development
  • 28.4 Maternal Changes During Pregnancy, Labor, and Birth
  • 28.5 Adjustments of the Infant at Birth and Postnatal Stages
  • 28.6 Lactation
  • 28.7 Patterns of Inheritance

Explain how the enteric nervous system supports the digestive system. What might occur that could result in the autonomic nervous system having a negative impact on digestion?

What layer of the alimentary canal tissue is capable of helping to protect the body against disease, and through what mechanism?

Offer a theory to explain why segmentation occurs and peristalsis slows in the small intestine.

It has been several hours since you last ate. Walking past a bakery, you catch a whiff of freshly baked bread. What type of reflex is triggered, and what is the result?

The composition of saliva varies from gland to gland. Discuss how saliva produced by the parotid gland differs in action from saliva produced by the sublingual gland.

During a hockey game, the puck hits a player in the mouth, knocking out all eight of his most anterior teeth. Which teeth did the player lose and how does this loss affect food ingestion?

What prevents swallowed food from entering the airways?

Explain the mechanism responsible for gastroesophageal reflux.

Describe the three processes involved in the esophageal phase of deglutition.

Explain how the stomach is protected from self-digestion and why this is necessary.

Describe unique anatomical features that enable the stomach to perform digestive functions.

Explain how nutrients absorbed in the small intestine pass into the general circulation.

Why is it important that chyme from the stomach is delivered to the small intestine slowly and in small amounts?

Describe three of the differences between the walls of the large and small intestines.

Why does the pancreas secrete some enzymes in their inactive forms, and where are these enzymes activated?

Describe the location of hepatocytes in the liver and how this arrangement enhances their function.

Explain the role of bile salts and lecithin in the emulsification of lipids (fats).

How is vitamin B 12 absorbed?

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Access for free at https://openstax.org/books/anatomy-and-physiology/pages/1-introduction
  • Authors: J. Gordon Betts, Kelly A. Young, James A. Wise, Eddie Johnson, Brandon Poe, Dean H. Kruse, Oksana Korol, Jody E. Johnson, Mark Womble, Peter DeSaix
  • Publisher/website: OpenStax
  • Book title: Anatomy and Physiology
  • Publication date: Apr 25, 2013
  • Location: Houston, Texas
  • Book URL: https://openstax.org/books/anatomy-and-physiology/pages/1-introduction
  • Section URL: https://openstax.org/books/anatomy-and-physiology/pages/23-critical-thinking-questions

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The Digestive System Essay Questions

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Essay on the Digestive System (For Students) | Human Physiology

digestive system essay questions


In this essay we will discuss about the digestive system in humans. After reading this essay you will learn about:- 1. Organs of Digestive System 2. Accessory Glands for Digestion of Foods.

Essay # 1. Organs of Digestive System:

Digestion means simplification of complex foods. It is the process of breaking various foodstuff into simple products. The complex foods like carbohydrates, proteins and fats are converted into glucose, amino acids and fatly acids respectively by the action of digestive enzymes. These simple substances enter into the blood circulation after absorption and then they are utilized by the body.

Digestive system consists of two main organs:

(1) Alimentary Canal

(2) Digestive Glands

1. Alimentary Canal:

This is also known as digestive tract or gastrointestinal tract. It is a long tube of varying diameter which begins at the mouth and ends at the anus. The length of this tube is about 8-9 meters. It opens at both the ends. The alimentary canal starts at the mouth into which cavity, the glands of the mouth pour the juice. As it passes backwards, it spreads into a funnel shaped cavity called-pharynx.

The tube then narrows into a soft muscular tube about ten inches in long, called the food pipe or gullet. This passes down the neck into the chest. It then opens into the stomach by piercing the diaphragm. The stomach is a large bag lying a little to the left under the diaphragm. It has two openings, one where the food pipe ends and the other where the intestines begin. The alimentary canal narrows again and passes into the small intestine which is about twenty two feet in length.

The first ten inches of the small intestine is called as Duodenum which forms a ‘C’ shaped loop. The rest of the small intestine is like a coiling tube, whose ends opens into a wide but comparatively short tube known as large intestine. It is about six feet long. The last part of the Large Intestine is known as Anus.

2. Digestive Glands:

Various digestive glands help in the digestion of foods.

(1) Salivary glands in the mouth,

(2) Gastric glands in the stomach

(3) Pancreas,

(5) Intestinal glands in small intestine.

All these digestive glands secrete digestive juices containing different enzymes which digest carbohydrate, protein and fatly foods.

Digestive juices:

Five digestive juices are secreted from digestive glands of the body. The enzymes present in these juices help in the digestion of different types of foods.

These juices are:

1. Salivary juice from salivary glands in mouth.

2. Gastric juice from Gastric glands in the stomach.

3. Pancreatic juice from Pancreas.

4. Intestinal juice from Small Intestine.

5. Bile juice from Liver.

Digestive Organs

Why so many digestive juices are necessary for digestion of food?

There are three reasons for the presence of so many digestive juices:

1. One digestive juice cannot digest three types of foods i.e. proteins, fats, and carbohydrates up to their completion.

2. One digestive juice cannot digest one particular type of food up to its completion, because food cannot remain in one place for a longer period of time.

3. The medium of action of enzymes present in different digestive juices are different. Some act on acidic medium and some on alkaline medium.

Digestion in Different Parts of Alimentary Canal:

The alimentary canal consists of the following organs in which foods are digested:

2. Oesophagus

4. Duodenum

5. Small Intestine

6. Large intestine

The mouth cavity is the front spread out end of the food pipe. The sides of the cavity are formed by the cheeks, the roof by the palate, and the floor by the tongue. When closed, it is bound in-front by the upper and the lower sets of teeth meeting in the middle. The opening at the back of the mouth is known as throat on each side of which there is a mass of tissue called tonsils. In the outside of the mouth cavity there is a slit like opening which is bounded by two soft movable lips.

digestive system essay questions

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digestive system essay questions

Essay Examples on Digestive System

An introduction to the analysis of the digestive system, organs of digestive system, the digestive process of food in the alimentary canal and accessory digestive organs in the digestive system of the human body, the effects of enzymes in treating digestive system disorders, my dinner through the digestive system, the role of digestive system and respiratory system in environmental exchange, inflammatory bowel disease (ibd), how different body systems works together for our health, acid reflux disease symptoms, causes and treatments, the damages of eating disorders, achlorhydria: symptoms, causes, and diagnostic tests, the role of gut microbiota in the health of the host, digestive system and its role in the care of children with stoma, infliximab in the treatment of crohn's disease, science practical report stomach acid, typical and atypical symptoms of gerd (gastroesophageal reflux disease), the benefits of fermentation for digestive system, feeling stressed about your essay.

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digestive system essay questions


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