NUTRITION By Nerea Silva Sánchez & Alicia Romero Viñas
NUTRITION Nutrients give our cells all the energy they need. The digestive system ,the respiratory system, the circulatory system and the excretory system carry out the function of nutrition.
THE DIGESTIVE SYSTEM The digestive system has two parts, the digestive tract and the digestive glands. 1.The mouth has salivary glands that produce saliva, teeth that chew food and a tongue that mixes chewed food with saliva to form a ball of food. 2.The pharynx connects the mouth and the oesophagus. 3.The oesophagus transports the food to the stomach.
4.The stomach is where the food mixes with gastric juices. 5.The liver secretes bile. 6.The pancreas helps in the digestion of proteins. 7.The small intestine is the longest part of the digestive tract.Nutrients pass into blood through its walls. 8.The large intestine absorbs water with passes to the blood. And finally, undigested substances are expelled through the anus.
THE RESPIRATORY SYSTEMThe respiratory system is in charge of breathing.Breathing makes two movements: First, we inhale air and it goes into to the lungs. Then, we exhale air sending it out to the lungs.1.The nostrils filter the air.2.The pharynx connects the larynx, the oesophagus and the trachea.3. The larynx contains the vocal cords.4. The trachea is a tube that takes air into the bronchi.5.The bronchi are two branches of the trachea.
6.The lungs are spongy organs made up of small sacs called alveoli.7. When we breathe, the oxygen in the air goes to the blood through the alveoli, and the carbon dioxide from the blood is released outside the body. The diaphragm is the muscle that creates the movements.
THE EXCRETORY SYSTEMThe excretory system filters waste substances from the blood. It removes them from the body through excretion.The excretory system is made up of : Sweat glands. The urinary system. This is made up of the kidneys and the urinary tract.
THE URINARY SYSTEM1.The kidneys remove waste substances from theblood and they make the urine.2.The ureters take urine from the kidneys to thebladder.3.The bladder stores the urine.4.The urethra connects the bladder to the outside.
THE CIRCULATORY SYSTEMThe circulatory system transports nutrients and oxygen to our cells.It is made up of the heart, the blood and the blood vessels.The heart is a muscular organ that pumps blood around the body.The blood collects oxygen and nutrients and tranports them to all the cells.It also collects waste substances and takes them to the sweat glands and the urinary system.The blood vessels.There are three types:arteries, veins and capillaries.
The arteriesThe veins carry carry blood fromblood from all the heart to theover the body rest of the body.back to theheart. The capillaries are very thin vessels that reach all the cells of the body.
THE BLOODBlood is a red liquid tissue made up of cells that float in a liquid called plasma.There are three types of blood cells,red blood cells, white blood cells and platelets. Red blood cells carry oxygen. White blood cells remove bacteria and viruses from the blood. Platelets are small fragments of cells that form blood clots.
THE HEARTThe heart uses rhythmic systole and diastole movements to pump the blood around the body.Blood enters the atria through the veins and passes to the ventricles.Blood comes out of the ventricles, through the arteries and travels all over the body.
HUMAN CIRCULATIONHuman circulation is closed and double. Human circulation is closed. In mammals, the heart septum separates the two halves of the heart. Human circulation is double. The blood follows two routes. -Pulmonary circulation. -Systemic circulation.