Food is ingested to mouth. The Buccal cavity or mouth consists of teeth, tongue and salivary glands. With the help of teeth, physical digestion of food takes place which helps the food to cut into small pieces, chews and grind it. Further salivary glands present in the mouth helps in the chemical digestion of food with the help of enzymes. It contains enzymes known as salivary amylase which digest the starch present in food into sugar. We can say that the digestion of carbohydrate or starch begins in the mouth itself. But the digestion of food remains incomplete in the mouth.
2. Oesophagus or Food Pipe
The slightly digested food goes to stomach through the Food Pipe or Oesophagus. With the help of peristaltic movement food is pushed inside the stomach. The contraction and expansion of the movement of the walls of the food pipe after entering the slightly digested food is known as peristaltic movement.
Do you know that food is churned in the stomach for three hours? In the stomach, food further breaks into smaller pieces and forms a semi-solid paste. Glands that are present in the walls of stomach secrete gastric juice and contain three substances hydrochloric acid, enzyme pepsin and mucus. The protein digestion begins in the stomach only with the help of pepsin enzyme.
Do you know which Human Body Organs can be donated
4. Small Intestine
The small intestine is a long, thin tube about 1 inch in diameter and about 10 feet long. It is located just inferior to the stomach and takes up most of the space in the abdominal cavity.
With the help of ‘sphincter muscle’ food from the stomach releases in small amounts into the small intestine. Do you know that the largest part of the alimentary canal is small intestine? It is the organ of human body where complete digestion of food like carbohydrates, proteins and fats takes place. The small intestine receives the secretions of two glands that is liver and pancreas and helps in the digestion of food. Even intestinal juice also helps in the carbohydrate digestion. After digestion the molecules of food become small and pass through the small intestine and goes into our blood. Here, the digested food is also absorbed.
The human digestive system consists of the gastrointestinal tract plus the accessory organs of digestion (the tongue, salivary glands, pancreas, liver, and gallbladder). Digestion involves the breakdown of food into smaller and smaller components, until they can be absorbed and assimilated into the body.
Pharynx (throat): Tube that delivers air from your mouth and nose to the trachea (windpipe). Trachea: Passage connecting your throat and lungs. Bronchial tubes: Tubes at the bottom of your windpipe that connect into each lung. Lungs: Two organs that remove oxygen from the air and pass it into your blood.
Human Respiratory System
The nose, pharynx, larynx, trachea and bronchi all work like a system of pipes through which the air is funnelled down into our lungs. There, in very small air sacs called alveoli, oxygen is brought into the bloodstream and carbon dioxide is pushed from the blood out into the air.
There are 3 major parts of the respiratory system: the airway, the lungs, and the muscles of respiration. The airway, which includes the nose, mouth, pharynx, larynx, trachea, bronchi, and bronchioles, carries air between the lungs and the body’s exterior.
The respiratory system is the network of organs and tissues that help you breathe. It includes your airways, lungs, and blood vessels. The muscles that power your lungs are also part of the respiratory system. These parts work together to move oxygen throughout the body and clean out waste gases like carbon dioxide.
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