Excretion
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When the body lost too much water
• Volume of water in the blood decreases • Osmoreceptors are stimulated and send an impulse to the putuiary gland • The pituiary gland secretes more ADH • ADH increases the permeability of the renal tubules • Urine becomes more concentrated and more water is re-absorbed
What happen your body has too much water
• Volume of water in the blood increases • Osmoreceptors in the hyphothalamus send an impulse to the pituiary gland • Pituiarty secretes less ADH • Less ADH decreases the permeability in the renal tubules • urine becomes more dilute and more water in released
When the blood is too acidic
• More hydrogen ions are excreted from the blood to the renal tubules • More bicarbonate ions are reabsorbed into the blood • Thus PH in the blood is increased until it becomes normal
When the blood is too basic or alkaline
• Less hydrogen ions are excreted from the blood into the renal tubules • Less bicarbonate ions are re absorbed into the blood • This way the PH of the blood decreases until it becomes normal
When there is a shortage of sodium in the blood
• The adrenal cortex secretes more aldosterone • More sodium is re-absored by the blood capillaries at the distal and collecting tubules and less sodium ions are excreted • the sodium amount will increase until it’s back to normal
An excess of sodium ions in the blood
• The adrenal cortex secretes less aldosterone • less sodium is absorbed by the blood capillaries ,more sodium ions are excreted • Amount of sodium in the blood is decreased until it gets back to normal