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karthikmns
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eval_testing_mns

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What are the substances that secretes into DCT?
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Do you know?
After the age of 40 years the number of functioning nephrons usually decreases
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by about 10% in every 10 years.
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iv) Formation of hypertonic Urine
75% of water content of nephric filtrate is reabsorbed in the region
of proximal convoluted tubule. 10% of water passes out of filtrate through
osmosis in the area of loop of Henle. Further concentration of urine takes
place in the area of collecting tubes in the presence of hormone called
80 X Class Excretion The wastage disposing system
i) Glomerular filtration: Blood flows inside the glomerulus ii)Tubular reabsorption:TheThe
under the influence of pressure due to the narrowness of peritubular capillaries around
efferent arteriole. As a result it undergoes pressure filtration PCT reabsorb all the useful
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or ultra filtration. Waste molecules, nutrient molecules and components of primary urine
water are filtered out and enter the Bowman’s capsule. such as glucose, amino acids,
vitamin C, Potassium, Calcium,
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Sodium, Chlorides and 75% of
PCT Water.
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glomerulus
DCT
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iii) Tubular secretion: It is
the active secretion of waste
products by blood capillaries
into the urinary tubule. It
ensures removal of all the
waste products from blood,
viz., urea, uric acid, creatinine,
LA salt ions like K+, Na+ and H+
ions. This maintance proper
concentration and pH of urine.
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fig-7: Mechanism of
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urine formation
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vasopressin. The hormone is secreted only when concentrated urine is to
be passed out. Think why is it not secreted when a person drinks a lot of
water? Absence of vasopressin hormone produces dilute urine. Hormone
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action maintains osmotic concentration of body fluids. Deficiency of
vasopressin causes excessive, repeated, dilute urination called diabetes
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insipidus.
Why more urine is produced in winter?
What happens if reabsorption of water does not takes place?
Now let us discuss remaining parts of excretory system.
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2. Ureters
There are a pair of whitish, narrow distensible and muscular tubes of
30cm length. Each ureter arises from hilus of the kidney. It moves
downward and obliquely opens into the urinary bladder. Ureter carries urine
from the kidney to the urinary bladder. The movement of urine in the ureter
is through peristalysis.
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Free distribution by T.S. Government 2019-20 81
3. Urinary bladder
It is a median, pear shaped and distensible sac. It is situated in the