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Digestive System. By: Natalie Stepniewski and Amanda Sette. Overview. In this PowerPoint, the following will be explained: What is the Digestive System? What are the organs in the digestive system? What do they do? What is the order of the organs in which the process occurs?.

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digestive system

Digestive System

By: Natalie Stepniewski and Amanda Sette

overview
Overview
  • In this PowerPoint, the following will be explained:
    • What is the Digestive System?
    • What are the organs in the digestive system? What do they do?
    • What is the order of the organs in which the process occurs?
what is the digestive system
What is the Digestive System?
  • Digestion, in a nut shell, is the breakdown of food.
  • It simplifies substances that are consumed so they can be absorbed by the body.
  • The body can then use these substances for energy, growth, and reproduction.
organs in the digestive system
Organs in the Digestive System
  • The organs included in the Digestive System are:
    • Mouth
    • Esophagus
    • Liver
    • Stomach
    • Colon
    • Cecum
    • Rectum
    • Kidney
    • Bladder
mouth
Mouth
  • The mouth is the entry area for the food and the beginning point of digestion.
  • The lips pick up loose food, which is passed into the mouth by the tongue.
  • The food is ground up by the teeth and mixed with saliva released from the saliva glands to make the

food easier to swallow.

  • The food is then passed into the pharynx by

the base of the tongue.

pharynx
Pharynx
  • The pharynx is a short, funnel-shaped, muscular tube between the mouth and the esophagus.
  • It forces food into the esophagus.
epiglottis
Epiglottis
  • The epiglottis is a triangular, lid-like piece of cartilage located at the base of the tongue.
  • It prevents food and water from entering the airways.
esophagus
Esophagus
  • The esophagus is a muscular tube extending from the pharynx down the left side of the neck and to the stomach.
  • Food and water is forced down it to the stomach by a progressive wave of constriction.
  • Food/water enters the stomach at an oblique angle, making regurgitation impossible.
liver
Liver
  • The liver is the largest gland in a horse’s body.
  • It secretes a continuous flow of bile, which aids in digestion of fats.
stomach
Stomach
  • The stomach is a “U” shaped muscular sac in the front part of the abdominal cavity.
  • Food entering the stomach is arranged in layers, end next to small intestine filling up first.
  • The stomach further breaks down food, mixing it with different acids.
  • Once the food is broke down further, it is passed into the small intestine.
duodenum
Duodenum
  • It continues the process of food breakdown.
  • Bile breaks down food particles into smaller droplets.
small intestine
Small Intestine
  • The small intestine is the major part of digestion. Pancreatic enzymes help digest the food; carbohydrates digest sugars and starches; proteases break proteins down into amino acids; and bile from the liver is added to break down the food into smaller pieces.
  • After the food has been digested, it is absorbed through the small intestine walls and carried by the blood stream to wherever it is needed.
colon
Colon
  • Moisture from the food is absorbed here and is used throughout the body.
  • It is 12 ft long and 8-10 inches in diameter.
cecum
Cecum
  • The cecum is a large pouch through which feed moves more slowly than through the rest of the digestive system.
  • It breaks down fibers and provides the horse with important nutrients like volatile fatty acids and some amino acids that would otherwise be wasted.
rectum
Rectum
  • The rectum is a short straight tube, about

1 ft in length.

  • It holds waste material after all the

nutrients have been used throughout the

body.

kidney
Kidney
  • The tubules of the kidney produce urine by removing waste products from the blood flowing through it.
bladder
Bladder
  • The bladder stores urine that came from the kidneys before disposal.
order of organs
Order of Organs
  • Teeth
  • Tongue
  • Saliva glands
  • Pharynx
  • Epiglottis
  • Esophagus
  • Liver
  • Stomach
  • Duodenum
  • Small intestine
  • Colon
  • Cecum
  • Rectum
  • Kidney
  • Bladder