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The Excretory System & Waste Management Now “urine” for it!

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Presentation on theme: "The Excretory System & Waste Management Now “urine” for it!"— Presentation transcript:

1 The Excretory System & Waste Management Now “urine” for it!

2 Excretion - The act or process of discharging metabolic waste matter from the blood, tissues, or organs. Excretion - The act or process of discharging metabolic waste matter from the blood, tissues, or organs. #1 vs. #2

3 Metabolic Wastes All the metabolic wastes are excreted in a form of water solutes through the excretory organs, with the exception of CO2, which is excreted together with the water vapor throughout the lungs. All the metabolic wastes are excreted in a form of water solutes through the excretory organs, 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. The elimination of these compounds enables the chemical homeostasis of the organism. Homeostasis: process of maintaining a stable internal environment. Homeostasis: process of maintaining a stable internal environment.

4 Lungs Waste: CO 2 + H 2 O Waste: CO 2 + H 2 O Carbon Dioxide is toxic Carbon Dioxide is toxic Too much water thins blood and bloats cells to the point of rupture Too much water thins blood and bloats cells to the point of rupture Also major organ for alcohol release Also major organ for alcohol release

5 Liver Urea Urea proteins  amino acids  NH 2 removed  forms ammonia, liver converts to urea proteins  amino acids  NH 2 removed  forms ammonia, liver converts to urea Breaks down amino acids -> Ammonia is a waste product Breaks down amino acids -> Ammonia is a waste product Ammonia (NH 3 ), which is highly toxic, is quickly converted to urea Ammonia (NH 3 ), which is highly toxic, is quickly converted to urea Is the liver an excretory organ? Is the liver an excretory organ?

6 Skin Sweat: Urea, Water, Mineral Salts Sweat: Urea, Water, Mineral Salts 2 functions of sweat: release toxins and cool body 2 functions of sweat: release toxins and cool body 2 types of sweat glands: eccrine glands and apocrine glands 2 types of sweat glands: eccrine glands and apocrine glands Eccrine glands are the primary gland for perspiration Eccrine glands are the primary gland for perspiration Does sweat have an odor? Does sweat have an odor?

7 Kidney Filters blood plasma, eliminates waste, returns useful chemicals to blood Filters blood plasma, eliminates waste, returns useful chemicals to blood Forms Urine: Urea, Water, Mineral Salts Forms Urine: Urea, Water, Mineral Salts Does urine have an odor? Does urine have an odor?

8 Urine vs. Sweat

9 WASTE PRODUCTS ORIGIN OF WASTE EXCRETORY ORGAN 1. Ammonia (NH 3 ) - breaks down of amino acids in liver kidneys 2. Urea - Converts NH 3 to urea in liver kidneys, skin 3. CO 2 Cell respiration – break down of glucose in cells lungs, intestines, skin 4. H 2 O Cell respiration – break down of glucose in cells kidneys, lungs, skin 5. Mineral salts - From food & water kidneys, skin

10 Urinary System

11 The urinary system is composed of 2 kidneys, 2 ureters, 1 urinary bladder and a urethra. The urinary system is composed of 2 kidneys, 2 ureters, 1 urinary bladder and a urethra. These are the structures that are directly involved in the production and excretion of urine. Each kidney is like a big filter that cleans the blood. These are the structures that are directly involved in the production and excretion of urine. Each kidney is like a big filter that cleans the blood. The ureters are tubes that carry urine from the kidneys to the urinary bladder. The ureters are tubes that carry urine from the kidneys to the urinary bladder. The bladder stores the urine temporarily. The bladder stores the urine temporarily. The urethra is the tube through which the urine leaves the body when you urinate. The urethra is the tube through which the urine leaves the body when you urinate.

12 A pair of renal arteries branch off the aorta, which carries blood full of wastes, into the kidneys. A pair of renal arteries branch off the aorta, which carries blood full of wastes, into the kidneys. The kidneys form urine by filtering wastes & excess water from the blood. The kidneys form urine by filtering wastes & excess water from the blood. The cleaned blood is returned to the circulatory system by the renal veins. The cleaned blood is returned to the circulatory system by the renal veins.

13 The urine is stored in the renal pelvis of the kidney before it trickles out each kidney through the ureters into the bladder. The elastic walls of the bladder stretch as it gradually fills. A sphincter keeps the bladder closed. The urine is stored in the renal pelvis of the kidney before it trickles out each kidney through the ureters into the bladder. The elastic walls of the bladder stretch as it gradually fills. A sphincter keeps the bladder closed. When you urinate, the sphincter relaxes & the urine flows into the urethra, which leads to outside the body. When you urinate, the sphincter relaxes & the urine flows into the urethra, which leads to outside the body.

14 Urine is about 96% water & 4% wastes. Urine is about 96% water & 4% wastes. Bile pigments from the liver give colour to both urine & feces. The yellow colour of your urine depends on how dilute the pigment is. If you drink a lot of liquids, your urine will be pale yellow. If you sweat a lot or drink very little, you will not urinate as often and your urine will be dark yellow (like first thing in the morning). Bile pigments from the liver give colour to both urine & feces. The yellow colour of your urine depends on how dilute the pigment is. If you drink a lot of liquids, your urine will be pale yellow. If you sweat a lot or drink very little, you will not urinate as often and your urine will be dark yellow (like first thing in the morning).

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