Major Organs Of The Human Body Grade 4

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Major Organs Of The Human Body Grade 4

Major Organs Of The Human Body Grade 4

Harvey J. Dworken Professor of Medicine Emeritus, Case Western Reserve University, Cleveland, Ohio. Author of “Gastroenterology: Pathophysiology and Clinical Applications” and others.

Digestive System Model Demonstrating Sequence And Length Of Organs

Nicholas Kerr Hightower Senior Consultant, Division of Gastroenterology, Scott and White Clinic and Scott and White Memorial Hospital, Temple, Texas. “Digestion” contributor to Best and Taylor, The Physiological Basis…

William T. Keeton Liberty Hyde Bailey Professor of Biology, Cornell University, Ithaca, New York, 1969-1980. Biological Science Author; Elements of biological science.

Encyclopaedia Editors Encyclopaedia editors oversee topics in which they have extensive knowledge, whether acquired through work on the content or through graduate study. They write new content and review and edit content received from contributors.

Human digestive system, the system used in the human body for the digestive process. The human digestive system consists primarily of the digestive tract, or a series of structures and organs through which food and liquids are processed into forms that are absorbed into the bloodstream. The system also consists of structures through which waste is removed and other organs that provide the juices necessary for the digestive process.

Human Digestive System

The abdominal organs are supported and protected by the pelvis and ribs and covered by the greater omentum, a fold of peritoneum composed mainly of fat.

The digestive tract starts at the lips and ends at the anus. It consists of a mouth or oral cavity with teeth for grinding food and a tongue for kneading food and mixing it with saliva; throat or throat; digestive tract; stomach; the small intestine, which consists of the duodenum, jejunum, and ileum; and the large intestine, which consists of the cecum, a closed terminal pouch that connects to the ileum, the ascending colon, the transverse colon, the descending colon, and the sigmoid colon, which ends in the rectum. The glands that contribute to the digestive juices are the salivary glands, the gastric glands in the stomach lining, the pancreas and the liver and their auxiliaries, the gallbladder and bile ducts. All these organs and glands contribute to the physical and chemical breakdown of ingested food and ultimately to the elimination of indigestible waste. This section describes their structures and functions step by step.

A small amount of food digestion actually takes place in the mouth. However, chewing or mastication prepares food in the mouth so that it passes through the upper digestive tract into the stomach and small intestine, where the main digestive processes take place. Chewing is the first mechanical process that food undergoes. Mandibular movements during chewing are caused by the muscles of mastication (muscles of mastication, temporalis, medial and lateral pterygoids and buccinator). The sensitivity of the periodontal membrane, which surrounds and supports the teeth, rather than the strength of the muscles of mastication, determines the force of the bite.

Major Organs Of The Human Body Grade 4

Chewing is not necessary for adequate digestion. However, chewing aids digestion by reducing food to small particles and mixing it with the saliva produced by the salivary glands. Saliva lubricates and moistens dry food, while chewing saliva distributes throughout the food mass. The movement of the tongue against the hard palate and cheeks helps to form a rounded food mass or bolus.

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The lips, the two fleshy folds that surround the mouth, consist externally of skin and internally of mucosa, or mucosa. The mucous membrane is rich in mucus-secreting glands, which together with saliva provide adequate lubrication for speech and chewing.

The cheeks, the sides of the mouth, are continuous with the lips and have a similar structure. A distinct fat pad is found in the subcutaneous tissue (tissue under the skin) of the cheek; this pad is extra large for babies and is known as a suction pad. On the inner surface of each cheek, opposite the second upper molar tooth, there is a small elevation that marks the opening of the parotid canal, which leads from the parotid salivary gland located in front of the ear. Just behind this gland are four to five mucus-secreting glands, the ducts of which open opposite the last molar tooth.

The roof of the mouth is concave and is formed by the hard and soft palate. The hard palate is formed by the horizontal parts of the two palatine bones and the palatal parts of the maxilla or maxilla. The hard palate is covered by a thick, somewhat pale mucosa, which is continuous with the gingival mucosa and is connected to the maxillary and palatine bones by tough fibrous tissue. The soft palate is continuous with the hard palate in front. Posteriorly, it is continuous with the mucosa covering the floor of the nasal cavity. The soft palate consists of a strong, thin, fibrous sheet, the palatine aponeurosis, and the glossopalatine and pharyngopalatine muscles. A small projection called the uvula hangs loosely from the back of the soft palate.

The floor of the mouth can only be seen when the tongue is raised. In the midline, there is a visible, raised fold of mucous membrane (frenulum linguae) that connects each lip to the gums, and on each side there is a small fold called a sublingual papilla, from which the ducts of the submandibular salivary glands open. From each sublingual papilla, a ridge (plica sublingualis) moves outwards and backwards, which marks the upper edge of the sublingual (under the tongue) salivary gland and on which most of the ducts of this gland open.

Structural Organization Of The Human Body

The gums consist of mucous membranes connected by thick fibrous tissue with a membrane that surrounds the jawbones. The gingival membrane rises to form a collar around the base (exposed part) of the crown of each tooth. Rich in blood vessels, the gingival tissue receives branches from the alveolar arteries; these blood vessels, called alveolar because they are associated with the alveoli dental, or tooth sockets, also supply the teeth and the spongy bone of the upper and lower jaws that contain the teeth. The human body is a complex biological system that includes cells. , tissues, organs and systems work together to make a person.

From the outside, the human body can be divided into several main structures. The head, which houses the brain, controls the body, while the neck and trunk contain many important systems that keep the body alive and healthy. Limbs help the body move and function.

The human body has five main senses that it uses to convey information about the outside world to the brain. These senses are: sight (eyes), hearing (ears), smell (nose), taste (tongue) and touch (skin).

Major Organs Of The Human Body Grade 4

The human body is made up of several organ systems consisting of organs and other body structures that work collectively to perform a specific function. Generally, the body is divided into 11 systems.

What Are The Heaviest Organs In The Human Body?

Skeletal System – The skeletal system consists of bones, ligaments and tendons. This system supports the overall structure of the body and also protects the organs.

Muscular System – It works closely with the skeletal system and helps the body move and interact externally.

Cardiovascular/circulatory system – This system consists of the heart, blood, and blood vessels and helps deliver nutrients throughout the body.

Digestive System – This includes the stomach, small intestine, large intestine, liver and pancreas and helps convert food into nutrients and energy for the body.

Major Organs Activity

Nervous system – helps the body communicate and allows the brain to control various body functions. It includes the brain, spinal cord and a large network of nerves.

Respiratory system – it brings oxygen into the body through the lungs and trachea, and also removes carbon dioxide from the body.

Endocrine System – It produces hormones that help regulate other body systems, including the pancreas, adrenal glands, thyroid, pituitary gland, and more.

Major Organs Of The Human Body Grade 4

Urinary System – This uses the kidneys to filter blood and eliminate waste, and includes the kidneys, bladder, and urethra.

The Human Body: Anatomy, Facts & Functions

Reproductive system – This includes the reproductive organs that allow humans to bear children. This system is different for the body of men and women.

Integumentary system – helps protect the body from the outside world. This includes the skin, hair and nails.

The human body is made up of cells. There are different types of cells in the human body. When many similar cells work together to perform a function, they form tissue. There are 4 main types of tissue including muscle tissue, connective tissue, epithelial tissue and nervous tissue.

Organs are independent parts of the body that perform specific functions. They consist of tissue. Examples of organs are the eyes, heart, lungs, liver and stomach.Billy Ray Cyrus song

Overview Of The Digestive System

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