1. Can you name the organs involved with excretion? The organs that make up the human excretion system are the liver, lungs, skin, and urinary system. The urinary system consists of kidneys, ureters, urinary bladder, and the urethra. back to questions

2. Why is urine yellow? The liver has many functions. One of them is to breakdown red blood cells. Within the red blood cell is a protein structure called hemoglobin. When hemoglobin breaks down it produces a pigment called urochrome. This yellow pigment is constantly filtered out of the blood as a waste product. Since red blood cells are constantly being destroyed by our liver, urochrome is continually being made. This pigment makes our urine yellow. back to questions

3. Do you know the correct pathway for the removal of urine from the human body?
Urine is first made in the KIDNEY. The urine will flow from the kidney's pelvic region & move into the URETER. The ureter will lead to the URINARY BLADDER where it will be stored. Once enough pressure is created the urine will leave the body through the URETHRA. back to questions

4. Different organisms have adaptations that allow them to remove cellular wastes effectively. These adaptations vary according to the... metabolic activities of the organism and the type of environment it inhabits. back to questions

5. Ammonia, a very toxic nitrogenous waste, is produced by aquatic animals. these animals do no die of ammonia poisoning because ammonia... readily diffuses into the watery environment. back to questions

6. According to the organisms that we studied this chapter which organism has the most similar structure to the nephron found in the human kidney? The earthworm's nephridia are most similar to the nephron, for both excrete urine which contains dissolved urea. The earthworm actually contains pairs of nephridia along each segment of its body. back to questions

7. The principle function of perspiration is to... regulate body temperature. back to questions

8. What is the integumentary system in humans? The integumentary system comprises skin, hair an nails. It provides the body a protective barrier and serves to help retain body fluids, protect against disease, eliminate waste products and regulate body temperature. back to questions