Nasal cavity – Preferred entrance for outside air into the respiratory system. The hairs that line the inside wall are part of the air-cleansing system. Larynx – Voice box. Contains the vocal chords. Moving air breathed in and out creates sound.
During this stage the tongue blocks the opening to the mouth, the uvula blocks off the opening to the nasopharynx, the larynx rise and the epiglottis covers its opening into the respiratory tract, and the upper esophageal sphincter relaxes to allow the bolus to pass through. Peristaltic contractions propel the bolus through the pharynx and into the esophagus. As food reaches the end of the esophagus the lower esophageal sphincter relaxes due to reflex and then closes tightly once the food has entered the
The first major muscle movement occurs when food or liquid is swallowed. Although you are able to start swallowing by choice, once the swallow begins, it becomes involuntary and proceeds under the control of the nerves. Swallowed food is pushed into the oesophagus, which connects the throat above with the stomach below. At the junction of the oesophagus and stomach, there is a ring like muscle, called the lower oesophageal sphincter, closing the passage between the two organs. As food
Fibre and other digested foods as they pass through the body do not change very much until it reaches the large intestine, the process of excretion after the reaching of the large intestine depends on the type of Fibre is consumed. There are two types of Fibre: soluble Fibre and insoluble Fibre. Soluble Fibre is a Fibre that is quite helpful to nutrients, as it makes energy from consumed substances leave the body at a smoother and steadier pace. Preventing tiredness, hunger pains, lack of energy and strength. Soluble Fibre when passing through the large intestine absorbs the water turning the faecal matter much softer, allowing the waste to pass through the body quickly.
The saliva which is contained in the mouth which is produces by the salivary glands begins to digest the food before the food is even swallowed. Saliva and the other chemicals which are produced along the way help speed up the digestive process which is called digestive enzymes. The mouth which is also known as the oral cavity is a specialized organ which receives food and breaks it into smaller pieces. The mouth is changed mechanically when biting and chewing food. In a humans mouth there are teeth and within a human they are four types of teeth which are used for different functions such as the incisor teeth are for biting and are found are the front of the mouth.
When these two senses react to food the salivary glands begin their work by creating saliva. Saliva is created for mouth lubrication and to help soften the food to slide through the esophagus. When the food enters the mouth, the tongue moistens it with saliva and moves it around. Therefore, the teeth can break down the food. This process converts the food into bolus.
The monosaccharides are them absorbed into the bloodstream. From blood, the monosaccharides are carried to the liver and converted into glucose and then stored in the liver or sent back out to feed the individual cells. Any fiber continues to the large intestine where some is metabolized by bacteria, but most is excreted. Fat From the mouth, chewing food breaks it down to a degree. The lingual lipase, found in saliva, plays a minor role in breaking down fat.
A2: 1. Mouth: The mouth starts mechanical digestion with the chewing that takes places there but also mixes amylase that is secreted from the salivary glands in with what is being chewed to start chemical digestion. (2) 2. Esophagus: The esophagus transfers food from the mouth to the stomach. (2) 3.
If you guessed the larynx, you would be correct. Not only is the larynx responsible for producing our voice, it also helps us swallow and breathe (Larynx, n.d.). Passing through the larynx, we enter the pharynx. Pharynx is just the medical term for the throat. Who knew that the pharynx is part of the respiratory and the digestive system?
Later these holes evolved into slits and gills which also helped in the respiratory system of the animal. The endostyle is homologious trait and is involved in filter feeding. In the chordated it is located on the floor of the pharynx. This glandular groove accumulates food particles and pass them also the digestive tract. It helps in iodine metabolism.