Unit3 Excretory System
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Transcript of Unit3 Excretory System
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Unit 3.D:The Excretory System
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Index
1. The Urinary System in Humans
2. Excretion
3. The anatomy of the kidneys
4. The production of urine
5. Diseases of excretory system
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1. Parts of the Urinary System in Humans Kidneys they remove urea and other
waste products from the blood and form urine.
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Ureters they carry urine from the kidney to the bladder
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Bladder it stores urine before it is released from the body. It has a muscular wall.
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Urethra It carries urine out of the body.
• Men urethra is common to the reproductive system
• Women urethra is an independant tube
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2. Excretion
Excretion is the elimination of waste products that are produced by the body cells.The cells release the waste substances into the blood. The blood must, therefore,be purified.
Metabolic waste products are:
• Nitrogen compounds excess of protein is broken down in the liver and forms urea
• Carbon dioxide• Water• Mineral salts
EXCRETORY ORGAN WASTE PRODUCTS
Lungs Carbon dioxide, water vapour
Kidneys Urea, water and salts
Skin Water and salts
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4. The anatomy of the kidneys
Each kidney is made up of thousands of small functional units knownas nephrons. Each one of these nephrons filters and purify the blood independently.
Blood enters the kidneys through the renal arteries
Glomerulus = capsule which contains lots of blood capillaries
Nephron
Bowman’s capsule surrounds the glomerulus
The tubules and the loop of Henle carry the urine to the ureters
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Renal cortex Bowman’s capsules
Renal medulla loops of Henle and collecting ducts
Renal pelvis ducts which collect the urine produced by the nephrons.
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4. The production of urine
The formation of urine is a very selective process. Urine contains: water toxic substances (urea, uric acid, etc.)
ureauric acid
ammonia
The composition of sweat is similar to urine. It is produced by filtering the blood that reaches the skin.
Activity 4, page 71
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1. Filtering:Substances go from the glomerulus to the Bowman’scapsule
2. Reabsorption:Water and useful substances go back from the tubulesto the blood
3. Urine (water, urea, uric acid, salts) arrives to the renal pelvis, where reaches the ureters.
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5. Diseases of Excretory System
Kidney stones crystals of uric acid
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Cystitis inflammation of the bladder caused by a bacterial infection.
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Renal insufficiency kidneys do not filter the blood correctly and waste products are not removed from the blood
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Hemodialysis filtering of blood in an apparatus to remove waste products. It is performed in cases of kidney failure.
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Kidney transplant
Video Urinary System, the nephron