Anatomy And Physiology Digestive System Notes Pdf

anatomy and physiology digestive system notes pdf

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Food that is chewed in the oral cavity then swallowed ends up in the stomach where it is further digested so its nutrients can be absorbed in the small intestine.

To survive, we need to take nutrients from the food that we eat. This is achieved by digestion, a complicated process that takes place in our gut. Although food contains all of the nutrients we need for good health, they are locked up in large, complex compounds. So that they can be used by the body, they must first be broken into smaller parts by the process of digestion.

Anatomy & Physiology of Digestion: 10 Facts That Explain How the Body Absorbs Nutrients

The digestive system uses mechanical and chemical activities to break food down into absorbable substances during its journey through the digestive system. Table Visit this site for an overview of digestion of food in different regions of the digestive tract. Note the route of non-fat nutrients from the small intestine to their release as nutrients to the body. The processes of digestion include six activities: ingestion, propulsion, mechanical or physical digestion, chemical digestion, absorption, and defecation.

The function of the digestive system is to break down the foods you eat, release their nutrients, and absorb those nutrients into the body. Although the small intestine is the workhorse of the system, where the majority of digestion occurs, and where most of the released nutrients are absorbed into the blood or lymph, each of the digestive system organs makes a vital contribution to this process. Figure 1. All digestive organs play integral roles in the life-sustaining process of digestion. As is the case with all body systems, the digestive system does not work in isolation; it functions cooperatively with the other systems of the body. Consider for example, the interrelationship between the digestive and cardiovascular systems.

Digestion: How food is broken down

The digestive system is a kind of processing plant inside the body. It takes in food and pushes it through organs and structures where the processing happens. The fuels and nutrients we need are extracted, and the digestive system discards the rest. The digestive system includes structures that form the alimentary canal and the accessory organs of digestion. Digestion breaks down large compounds in food and liquids into smaller molecules that can be absorbed into the bloodstream.


and hormonal mechanisms – food moving along the oral cavity and esophagus stimulates the parasympathetic nerves to activate the secretion in gastric glands.


Accessory Organs: Glands and Organs That Facilitate the Process of Digestion

The gastrointestinal tract GIT consists of a hollow muscular tube starting from the oral cavity, where food enters the mouth, continuing through the pharynx, oesophagus, stomach and intestines to the rectum and anus, where food is expelled. There are various accessory organs that assist the tract by secreting enzymes to help break down food into its component nutrients. Thus the salivary glands, liver, pancreas and gall bladder have important functions in the digestive system. Food is propelled along the length of the GIT by peristaltic movements of the muscular walls.

Gastrointestinal system anatomy

The human digestive system, also known as the digestive tract, the GI tract, the alimentary canal is a series of connected organs leading from the mouth to the anus.

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Сьюзан шла следом за ним, размышляя, по-прежнему ли Хейл прячется в Третьем узле. Свет от монитора Стратмора отбрасывал на них жутковатую тень. Сьюзан старалась держаться поближе к шефу на небольшой платформе с металлическими поручнями. По мере того как они удалялись от двери, свет становился все более тусклым, и вскоре они оказались в полной темноте. Единственным освещением в шифровалке был разве что свет звезд над их головами, едва уловимое свечение проникало также сквозь разбитую стеклянную стену Третьего узла.

Gastrointestinal tract

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Joshua R.

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Human Anatomy & Physiology: Digestive System; Ziser Lecture Notes, 1. The Digestive System. We need food for cellular utilization: →nutrients as.

Ray D.

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Intro to A & P: Digestive Anatomy; Ziser Lecture Notes, 1. The Digestive System. We need food for cellular utilization: →nutrients as building blocks for.

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