The Kidneys Flashcards
Label this diargam of the urinary system
vena cava
the main vein returning blood to the heart
renal vein
takes “cleaned” blood away from the kidneys
aorta
the main artery supplying oxygenated blood to the body
renal artery
brings blood containing “waste” to the kidneys
urethra
carries urine out of the body
ureter
carries urine to the bladder
bladder
muscular sac that stores urine (about 700cm3)
sphincter muscle
keeps the bladder closed
In diagrams, what colour is deoxygenated blood and what colour is oxygenated blood?
deoxygenated blood = blue
oxygenated blood = red
What are kidneys?
effieienct filtration units
kidneys clean the blood and put it back into the vena cava - waste is removed
What is waste and how is it removed?
waste = CO2, urea
waste is removed in the urine through the ureter
Label this “kidney connections” diagram
Label this “kidney connections” diagram
Label this structure of the kidneys diargam
medulla
lighter middle layer of the kidney
pelvis
central cavity which collects urine
cortex
darker outer layer
nephron
filtration unit (where urine is produced)
about 2cm long and very thin
How is waste removed from the body?
mouth (exhalation)
skin (sweat)
kidneys (urine)
What waste is removed from the body through the mouth (exhalation)?
CO2
water
What waste is removed from the body through the skin (sweat)?
urea
water
salt
What waste is removed from the body through the kidneys (urine)?
urea
water
salt
What is the main function of the kidney?
to get rid of waste such as:
urea
excess water
excess salt (mineral ions)
Is urea present in:
uncleaned blood
urine
cleaned blood
uncleaned blood: yes
urine: yes
cleaned blood: no
Are proteins present in:
uncleaned blood
urine
cleaned blood
uncleaned blood: yes
urine: no
cleaned blood: yes
Are red and white blood cells present in:
uncleaned blood
urine
cleaned blood
uncleaned blood: yes
urine: no
cleaned blood: yes
Is glucose present in:
uncleaned blood
urine
cleaned blood
uncleaned blood: yes
urine: no
cleaned blood: yes
Are amino acids present in:
uncleaned blood
urine
cleaned blood
uncleaned blood: yes
urine: no
cleaned blood: yes
Is salt present in:
uncleaned blood
urine
cleaned blood
uncleaned blood: yes
urine: yes
cleaned blood: a little
Is water present in:
uncleaned blood:
urine:
cleaned blood:
uncleaned blood: yes
urine: yes
cleaned blood: yes
Why is it important to remove urea?
it is toxic
Why is it important to remove excess water?
because of its osmotic effect
Why is it important to remove salt (mineral ions)?
because of its osmotic effect
How does drinking water change urine production?
drinking water —> high water concentration in blood –(kidneys)–> urine volume increases —> blood water concentration drops
How does being thirsty change urine production?
being thirsty —> low water concentration in blood –(kidneys)–> urine volume decreases —> blood water concentration increases
How does eating crisps change urine production?
high solute concentration in blood –(kidneys)–> urine volume decreases —> blood water concentration increases
As … passes through the kidneys, urea is taken out of it and passes into the …. The kidneys also regulate the amount of … and … in the blood and also make sure that the … of the blood is constant.
If you drink a lot of water, it is absorbed from your … into the … and it has an … on the blood. The diluted blood reaches the kidneys which take out … water than usual and pass it into the urine, thereby producing … urine which is more ….
If you eat a lot of … , the solute concentration in your blood …. To counteract this, the kidneys take out … water from the blood and pass it into the urine, therefore producing … urine.
This process of regulation is called ….
As blood passes through the kidneys, urea is taken out of it and passes into the urine. The kidneys also regulate the amount of water and salt in the blood and also make sure that the pH of the blood is constant.
If you drink a lot of water, it is absorbed from your cells into the bloodstream and it has an osmotic on the blood. The diluted blood reaches the kidneys which take out more water than usual and pass it into the urine, thereby producing more urine which is more diluted.
If you eat a lot of salt, the solute concentration in your blood increases. To counteract this, the kidneys take out less water from the blood and pass it into the urine, therefore producing less urine.
This process of regulation is called osmoregulation.
Label this urea production in the liver diagram
Explain what is happening in this diagram
protein, which is found in chicken, is made up of amino acids which are absorbed into the blood
excess amino acids cannot be stored so are first broken down in the liver
then, they are converted into carbohydrates (stored as glycogen) and the waste product urea
urea passes into the blood to be filtered out by kidneys during the formation of urine
CHECK
How does urine composition change when you eat a chicken?
the urine becomes more concentrated because there is more urea
Label this diagram of a the nephron
What are the two steps to urine production in the nephron?
step 1: ultrafiltration
step 2: selective reabsorption
What is ultrafiltration?
filtration at high pressure
Where does ultrafiltration take place?
in the glomerulus and the Bowman’s capsule)