excretory system
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EXCRETORY SYSTEM
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The job of the excretory system is to remove various wastes produced by the body. The removal process is known as excretion.
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The wastes produced by the body : - Carbon dioxide - Water - Nitrogenous wastes - Mineral Salts: (NaCl , KSO4)
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Ammonia Urea Uric Acid
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Functions of Excretion1. To Regulate the chemical
makeup of the blood and body fluids by removing wastes and excess materials.
2. To maintain a constant body temperature by removing excess heat.
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3. To maintain the homeostasis (internal balance) together with the circulatory, nervous and endocrine system
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Human Urinary System
The urinary system includes the
- Kidneys,
- Ureter,
- Urinary bladder,
- Urethra.
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Functions of Kidneys•They remove the wastes of cellular metabolism from the blood.
•They control the concentrations of the various substances found in the body fluids.
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The kidneys filter metabolic wastes and various other substances from the blood, producing urine.
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Two tubes, the ureters, carry the urine to the urinary bladder, where it is stored temporarily.
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Another tube, the urethra, carries the urine from the bladder to the outside of the body.
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Structure of KidneyThe kidney is divided into three distinct regions.
•The outermost region is the cortex,
•the middle region is the medulla, and
•the inner region is the
pelvis.
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The filtering of the blood occurs in the cortex; The medulla consists of collecting ducts that carry the urine; and The pelvis is a cavity connected to the ureter, into which the urine drains
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Structure of Nephron
•The functional units of the kidneys are the nephrons.
•A cluster of Blood capillaries, the glomerulus,
•It is surrounded by Bowman's capsule.
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Four functions of the kidney
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- proximal proximal convoluted convoluted tubuletubule- loop of Henleloop of Henle - distal distal convoluted convoluted tubuletubule- collecting ductcollecting duct
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A N
ep
hro
n
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Blood enters the kidneys through the renal arteries. It leaves the kidneys through the renal veins.
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MEIOSIS
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QUIZ
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1.What is the job of excretory system?
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2.What are the functions of excretory system?
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3. What are the metabolic wastes?
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4. What are the excretory organs in human body?
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5. List the parts of human urinary system?
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6. List the three parts of kidneys
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7.Which part of kidney is the functional unit
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8. Describe the structure of a nephron
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Cytokinesis
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Küm
esi
Sevg
i
Pinar
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