1. Mouth:
- Teeth: Mechanically break down food into smaller pieces.
- Tongue: Mixes food with saliva and helps with swallowing.
- Salivary glands: Secrete saliva, which contains enzymes that begin the digestion of carbohydrates.
2. Pharynx:
- The muscular tube that connects the mouth to the esophagus.
- Involved in swallowing, pushing food towards the esophagus.
3. Esophagus:
- A muscular tube that connects the pharynx to the stomach.
- Peristalsis (muscle contractions) move food down to the stomach.
4. Stomach:
- A muscular, J-shaped organ that churns and mixes food with gastric juices.
- Contains hydrochloric acid (HCl) and enzymes that digest proteins.
- Partially digests food and creates chyme, a thick, soupy mixture.
5. Small Intestine:
- The longest part of the alimentary canal, divided into three sections: duodenum, jejunum, and ileum.
- The primary site of nutrient absorption.
- Receives digestive enzymes from the pancreas and bile from the liver.
6. Large Intestine:
- Also called the colon, it absorbs water and forms feces.
- Divided into the ascending, transverse, descending, and sigmoid colon.
7. Rectum:
- The final section of the large intestine, stores feces before defecation.
8. Anus:
- The opening at the end of the alimentary canal through which feces are expelled.
These organs work together in a coordinated fashion to break down food, absorb nutrients, and eliminate waste.
