Excretory System Vocabulary


excretory system







The process by which the body tries to maintain a constant internal environment is called 1)_____________________. Our 2)_______________ ________________ aids this process by removing chemical wastes from the blood and balancing the amounts of needed substances in it. The 3)_______________ is also considered an excretory organ because it rids the body of some of the same wastes that are in urine by excreting them in sweat. 4)__________ is a waste that results from the breakdown of amino acids and is found in both urine and sweat. The primary organs of our excretory system are a pair of 5)_____________ found behind our abdominal cavity. They produce 6)________________ which is taken to its storage place called the 7)_________________ through two tiny muscular tubes known as the 8)____________________.

Bowman's capsule







The microscopic functional units in a kidney are called 9)_________________. They consist of a 10)___________________, which is ball of capillaries under a great deal of blood pressure. The process of 11)_____________ occurs here and is a "dumb" process by which particles small enough to fit through the tiny holes in the glomerulus walls go into a collecting cup known as 12)________________ ______________ . From here the liquid known as the 13)____________________ heads down a tiny tube appropriately named the nephron 14)________________ where a very important process occurs. Here, 99% of the water that escaped from the glomerulus is taken back into the blood capillaries by the process of 15)_____________________.





loop of Henle



The nephron tubule has a tiny loop that called the 16)________ ___ ___________ where molecules not wanted in the blood are transported into the tubule to be excreted in the urine. This process is called 17)__________________ and is how the body controls pH levels by removing 18)_________ ions and takes toxins from the blood such as 19)______________________ we are prescribed to get rid of infectious bacteria.

The kidneys tubule and its reabsorption rates are controlled by a hormone our pituitary gland (in our head) secretes called 20)_______ or antidiuretic hormone. 21)___________ is production of large amounts of urine. ADH slows this by increasing readsorption of 22)____________ in the tubules of the kidney.

blood pressure



negative feedback





A process in which a later step in a series of steps inhibits or decreases an earlier step is called 23)____________ _____________. When our blood pressure gets too low the brain's 24)_________________ senses this drop and sends a message to the body's master gland or 25)_______________. The pituitary responds by releasing ADH into the blood going through it. ADH's target organ is the kidneys' 26)_______________ which respond by reabsorbing more water back into the blood from the filtrate. Now less urine is produced and blood 27)_______________ is increased. This result is higher 28)________________ _________________ which inhibits the hypothalamus from sending a message to the pituitary, which no longer secretes ADH, so the kidney tubules reabsorb less water, so more urine is produced, but blood volume is 29)___________________ and blood pressure 30)___________. This lowering of blood pressure is sensed by the hypothalamus and ...........here we go again! What a great homeostatic process.