Write about the human digestive system describe the steps of digestion?
Question: Write about the human digestive system describe the steps of digestion?
The human digestive system is a complex system that consists of organs and glands that help in the breakdown of food and the absorption of nutrients. The main steps of digestion are:
- Ingestion: This is the process of taking food into the mouth and chewing it.
- Propulsion: This is the process of moving food through the gastrointestinal tract (GI tract) by muscular contractions called peristalsis.
- Mechanical digestion: This is the process of physically breaking down food into smaller pieces by chewing, grinding, and mixing with saliva in the mouth, and by churning and mixing with gastric juice in the stomach.
- Chemical digestion: This is the process of chemically breaking down food into simpler molecules by enzymes and acids in the mouth, stomach, and small intestine.
- Absorption: This is the process of transferring the digested nutrients from the lumen of the GI tract into the blood or lymph vessels.
- Excretion: This is the process of eliminating the undigested and unabsorbed waste products of digestion from the body through the anus.
The human digestive system also involves the accessory organs, such as the liver, pancreas, and gallbladder, that produce or store digestive juices and enzymes. The digestive system is regulated by nerves and hormones that coordinate the activities of different organs and glands. The digestive system also hosts a diverse community of bacteria, known as the gut microbiome, that aid in digestion and immunity.
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