systems of the body Essay

Submitted By bweaves
Words: 887
Pages: 4

Mouth: - The smell of food triggers the salivary glands in your mouth to secrete saliva, causing your mouth to water.
Saliva- salivary glan, located underneath the back of our tongue, creates our saliva (helps soften food so that it is easier to swallow). Saliva is also the first of several chemicals that start to break down foods into simpler forms. teeth : Digestion starts here. Teeth start tearing and crushing the food down into small enough pieces so that it can fit down our throats. stomach : uses chemicals, called gastric juices; to make the food tinier (includes hydrochloric acid and enzyme). The food is moved around and mixed with the chemicals for about 3 or 4 hours until it’s a a cream-like liquid call chyme. small intestine: where the real digestion takes place. As food passes through, it’s mixed with new chemicals and soon our "food" is now digested small enough to be put to use by the body. Along the walls of the intestine are 1000’s of tiny fingers called villi. Blood vessels (capillaries) in the villi can absorb the tiny food molecules and send them to the rest of our body through the blood. large intestine: Whatever the body cannot put to use is sent here. Big job is to remove water (Water is no longer needed) and in the large intestine water is sent into the blood stream. Food spends about 12 hrs in the large intestine where it become feces and later leaves the body through the anal opening when we go to the bathroom. Pancreas: adds a digestive chemical as the food leaves the stomach. This digestive juice works on breaking down the carbohydrates (breads) and the proteins (butter). gall bladder: When the gall bladder mixes bile with our food, it does an important job: breaking down the fat (butter) into tiny droplets. This fat will supply us with energy later.
Liver: produced bile to be stored in the gallbladder until needed by body Esophagus: transportation tube from the mouth to the stomach. When we swallow, we are closing a trap door in our throat called the epiglottis which sends food down the esophagus & prevents food from going down the trachea (or windpipe) and into our lungs. Food moves using muscles not gravity.

Pulmonary artery: carrying de-oxygenated blood to the lungs. These arteries also have strong, muscular walls that at regular intervals contract in harmonisation with the rate at which the heart beats.
Pulmonary veins: carries oxygenated blood from the lungs to the heart (and from there out to the body).
Septum: It separates oxygenated and de-oxygenated blood from mixing during the contraction cycle. If they mix, then the body cannot receive the oxygen it needs.
Aorta: the largest artery of the body. The primary function of the aorta is to carry oxygenated blood from the heart to the cells of the body.
Superior vena cava: to bring out the de-oxygenated blood from the head, arm, neck and chest areas of the body to the right atrium
Inferior vena cava: brings de-oxygenated blood from the lower body parts such as legs, abdomen, back and pelvis to the right atrium.
Semi lunar valves (pulmonary, artial valves): prevent blood backflow into the ventricles atrioventricular valves (tricuspid, bicuspid): responsible for preventing blood from flowing back into the atria at the moment the ventricles contract. These valves are situated at the point where the ventricles and atria meet. Atrioventricular valves are two in number; the bicuspid valve and tricuspid valve.
Vein: carry blood back toward your heart.…