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Cell interior that is surrounded by a wall made of carbohydrates and proteins and a membrane that is made largely of phospholipids
The movement of molecules from an area of higher concentration to an area of lower concentration
Is existent when there is a difference in concentration of molecules across a distance
The transport in which molecules move down their concentration gradient with the help of transport proteins in the membrane
The process by which very large molecules are moved into a cell by a special active transport mechanism that requires energy
The process by which very large molecules are moved out of a cell by a special active transport mechanism that requires energy
The opening between two guard cells in the epidermis of a plant leaf through which gases are exchanged with the air
The tendency for an organism to maintain a relatively stable internal environment by regulating its metabolism and adjusting to its environment
A toxic nitrogen compound (NH3) excrete by some aquatic organisms; thought to have been present in Earth's early atmosphere
The functional unit of a kidney consisting of a glomerulus, its associated capsule, and tubule surrounded by capillaries
An organ that regulates water and salt levels, filters water and wastes from the blood, and excretes the end products
A vertebrate organ system that regulates levels of water and dissolved substances in the body, excreting wastes as urine
An organ that stores urine before it is discharges from the body through the urethra
A ball of capillaries surrounded by a glomerular capsule in the nephron; the site of filtration in the kidneys
A hormone secreted by the adrenal gland, helps regulate sodium and potassium concentrations and water balance
A hormone released from the posterior lobe of the pituitary (an endocrine gland in the brain); enhances conservation of water by the kidneys
Molecules from blood are secreted unto nephron tubules, occurs as the filtrate moves through the tubule
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