Osmotic Pressure/Diuretics/Blood pH

What is osmotic pressure ?i i

Osmotic pressure is the force caused by water as it moves by osmosis .i i

Osmotic pressure is relative to ___ .i i

The concentration gradient .i i

What are osmoreceptors ?i i

Osmoreceptors are cells that are sensitive to the change in osmotic pressure .i i

Where are osmoreceptors found ?i i

Osmoreceptors are found in the hypothalamus in the brain .i i

What happens to your osmotic pressure if you are dehydrated (concentrated blood plasma) ?i i

Osmotic pressure increases

Osmoreceptors send a message to the pituitary gland to release ADH and cause more water to be reabsorbed from the nephron into the blood. This lowers osmotic pressure .i i

What do osmoreceptors do if you are over hydrated (osmotic pressure is too low) ?i i

Osmoreceptors stop ADH from being released

More water stays in the nephron and is removed in the urine. Osmotic pressure returns to normal .i i

What is a diuretic ?i i

A diuretic decreases the amount of ADH that is released .i i

What does a diuretic do ?i i

A diuretic causes more water to be released in the urine that can lead to dehydration .i i

Give 2 examples of diuretics .i i

1. Alcohol

2. Caffeine

What hormone causes Na+ to be reabsorbed into the capillaries ?i i

Aldosterone .i i

What pH level do more body fluids have ?i i

pH of 7.4 .i i

What do kidneys excrete and reabsorb to keep a normal pH level ?i i

Kidneys excrete H+ ions

Kidneys reabsorb HCO3- ions .i i

What happens if the blood is too acidic ?i i

H+ ions are excreted

HCO3- ions are reabsorbed .i i

What happens if the blood is too basic .i i

H+ ions are not excreted

HCO3- ions are not reabsorbed .i i