Present tense: I canât even find someone to lay tiles. Past simple tense: She laid her hand upon his arm. Present continuous tense: Weâre laying the groundwork for long-term economic growth. Past perfect tense: The government had laid their cards on the table. lie (1) = be in a horizontal position on a surface.
All the metabolic wastes are excreted in a form of water solutes through the excretory organs (nephridia, Malpighian tubules, kidneys), with the exception of CO2, which is excreted together with the water vapor throughout the lungs. The elimination of these compounds enables the chemical homeostasis of the organism.
Most animals have excretory systems for elimination of soluble toxic wastes. In humans, soluble wastes are excreted primarily by the urinary system and, to a lesser extent in terms of urea removed, by perspiration. The urinary system consists of the kidneys, ureters, urinary bladder, and urethra. The system produces urine by a process of filtration, reabsorption, and tubular secretion.