By volume what percentage of the air in the lower troposphere consists of water vapour

another part of the nutrient most used by the glucose for fuel cells is made in these phenomena: consumption of oxygen necessary for prensencia phenomenon occurs libration of energy, used by the cells production of carbon dioxide and water, water for the body but the dioxide is a residue k must be cast.

useful energy for the body: there are three forms of energy: mechanical, for muscle contraction. Cause the movement of the skeleton of the heart beat. Quimica, to make new molecules. Thermal, maintains our body temperature between 35 and 37

respiratory system is responsible for circulating the air between the body and the external environment there are two ways the upper Respiratory: is the nose and pharynx are the laringelas imferiores trachea bronchus and bronchioles pattern: nose and mouth are the air inlet passages. Trachea, flexible tube that always remains open to airflow. Lungs are two organossituados in toracita cavity and protected by the ribs. Pulmonary alveoli are small pockets of very thin walls at the end of the bronchioles. Larynx is funnel shaped its walls are of cartilage. Bronchi and bronchioles are tubes like the trachea as a tree branch.

gas exchange takes place between the atmospheric air and blood takes place in the alveoli of the alveoli caracterisricas are: the surface of all the alveoli is great. Alveoli are surrounded by countless bloody hair. The wall separating the alveolar air and blood.

Respiratory movements, entry and exit of air in the lungs occurs in the thorax. The thoracic cavity volume depends on the actions of the muscles of the diaphragm and located in the ribs. The contract, the thoracic cavity volume increases and if they relax the thoracic cavity volume decreases.

infeciones tract: infections of the upper respiratory tract are the cause of diseases like influenza. Respiratory tract infections below, if installed in the ducts causing bronchitis.

Urine contains 95% water and 5% of single substances. Urinary system parts: the kidneys are two bean-shaped organs in them as urine. Cortex, has granular appearance. The medulla, divided into zones with a pyramidal form. Blood vessels, entering and leaving the kidney by their openings. Bladder collects urine, which is continuously on the ureters. Ureters, are 2 k thin tubes collect urine produced by the kidney. The urethra, through k carries urine from the bladder to the outside. Urine factories: the kidney has one million base units called nephrons. A nephron consists of: one capsule, k surrounds a hollow ball of capillaries. A tubule, is a thin tube-shaped handle

HOMEOSTASIS: implement showcase be organs such as kidneys tabi lungs regulate the amount of oxygen. The liver, regulates the amount of glucose sangre.La k hay in skin, mediates the regulation of body