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Excretion vs. Elimination

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Excretion vs. Elimination Excretion vs. Elimination Your body makes several kinds of waste, which fall into two groups: Undigested solid wastes Wastes made by cells ... – PowerPoint PPT presentation

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Title: Excretion vs. Elimination


1
Excretion vs. Elimination
2
Excretion vs. Elimination
  • Your body makes several kinds of waste, which
    fall into two groups
  • Undigested solid wastes
  • Wastes made by cells

3
Elimination
  • Undigested solid waste leaves your body through
    the large intestine
  • Water is removed from the wastes in the large
    intestine, which allows for the formation of a
    solid (feces).

4
  • The solid wastes moves from the large intestine
    to the rectum.
  • From the rectum, the solid waste is excreted
    through the anus.

5
Excretion
  • When waste products made by cells (water, heat,
    carbon dioxide, salts, urea) leave your body
  • In many animals, CO2 leaves the body through the
    lungs
  • The liquid waste, urine, is made in the kidneys

6
  • Urine made up of water, heat, harmful chemicals
    (urea), and some salts
  • Perspiration when heat, water, and salt are
    excreted by the body through skin (i.e. sweating)

7
  • Write the correct waste product next to the
    excretory organ
  • 1. Skin
  • 2. Large intestine
  • 3. Lungs
  • 4. Kidneys
  • (word bank carbon dioxide, solid wastes, salt,
    harmful chemicals, water, heat)

8
  • The waste products are
  • Skin water, heat, salt
  • Large Intestine solid waste
  • Lungs carbon dioxide
  • Kidneys harmful chemicals, heat, salt

9
The Excretory System
  • The group of organs responsible for removing
    waste products from the body the excretory
    system
  • The main organs are
  • Lungs
  • Kidneys
  • Skin

10
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11
Lungs
  • When we breathe, we excrete CO2 waste, and small
    amounts of heat and water
  • Fact your lungs are capable of removing alcohol
    from the blood this is how a breathalyzer is
    able to determine a persons blood alcohol level

12
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13
Skin
  • Largest organ excretes most of the bodys waste
    heat
  • Also removes some water, salts, and very small
    amounts of urea
  • Perspiration helps the body cool off
  • When sweat evaporates from the skin, it cools the
    body, removing heat

14
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15
Kidneys
  • Fist sized, bean shaped (i.e. kidney bean) organs
    found on either side of the lower spine
  • Main job is to filter out wastes from the blood,
    making them more concentrated in preparation for
    excretion and, in the process of doing this,
    retaining as much water as possible

16
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17
  • The blood enters the kidney through the renal
    arteries renal veins carry blood back from the
    kidneys to the body
  • A ureter connects each kidney to the urinary
    bladder once urine has formed, the ureter
    carries the urine (produced after the blood has
    been filtered for wastes) from the kidney to the
    bladder

18
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19
  • Another tube, the urethra, carries the urine out
    of the body
  • In males, the urethra passes through the penis
    in females, it lies between the pubic bone and
    the front wall of the vagina

20
Label the diagram bladder, kidney, renal artery
and vein, ureter, urethra
21
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22
Nephrons
  • The filtration of the blood takes place in minute
    structures called nephrons, found in the cortex,
    which is the outer layer of the kidney
  • The nephrons estimate at more than 1 million per
    kidney

23
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24
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25
  • In spite of their size, the kidneys filter more
    than 180 L of blood every 24 hours
  • Most is reclaimed by the body, only 1.5 L of
    urine is passed each day
  • Your blood passes through the kidneys 300 times
    per day

26
Label the Kidney cortex, medulla, renal artery,
renal pelvis, renal vein, ureter
27
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28
Liver
  • A secondary organ of excretion
  • Does not excrete wastes, but is important for
    excretion
  • Handles cell wastes in several ways
  • 1) Breaks down dead red blood cells pass into
    digestive tract, then eliminated with solid waste
    by the bowels

29
  • 2) Weakens certain harmful substances
  • 3) Changes some harmful substances
  • Ex the liver makes bile from harmful substances
    bile is important in fat digestion after bile
    works on fat, it is eliminated from the bowels
  • 4) Combines certain harmful chemicals
  • Ex) liver combines ammonia and some CO2 forms
    urea, which the blood carries to the kidneys
    where it becomes part of the urine
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