antidiuretic hormone (ADH)

• what is adh short for


  antidiuretic hormone
• if there is less adh in the blood stream what does this mean about the urine


  it makes the urine more dilute
• if there is more adh in the blood stream what does this mean about the urine


  it makes the urine more concentrated
• what effect does adh have on the plasma membrane


  this makes the distal convoluted tubule cells and collecting duct more permeable to water
• how does adh work to make the membrane more permeable


  adh binds to receptor cells which results in aquaporins becoming incorporated in the plasma membranes
• where do aquaporins come from


  from within the cytosol
• what happens once adh makes the membrane more permeable


  water will be reabsorbed by osmosis
• What is negative feedback?


  A response to a change in the body that counteracts or opposes the initial change.
• what receptors detect water levels in the body

  osmoreceptors
• Where are osmoreceptors found?


  hypothalamus
• where is adh produced


  pituitary gland
• what happens after the osmoreceptors detect that there is too little water in the body


  a nerve impulse will be sent to the pituitary gland to release more adh
• when there is too little water in the blood what is the effector that will allow more water back into the blood

  cells of the distal convoluted tubules become more permeable
• if a person drinks 2 liters of water and now they have too much water in the body how will the body react to get back to optimum levels


  osmoreceptors in the hypothalamus detect an increase in the water potential of the blood.the posterior pituitary gland will release less adh and the collecting duct will become less permeable so water wont be reabsorbed back into the blood