Homeostasis Flashcards
What happens if a condition increases above optimum
Detected by receptors and then effectors cause changed that result it to return back to optimum level
What do we need to be controlled
Salt
Water
Glucose
PH
Body temp
Maintained of a stable internal environment
What is ADH
Plays part in regulating water
What are the different glands
Brain
Thyroid
Adrenal
Pancreas
Tested
What is osmoregulation
Amount of water in blood kept constant
Water potential too low - dehydrated
Water potential too high - too hydrated
What do kidney do
Responsible for keeping water level constant
What happens in the kidney nephron
Water controls
Taking in your sodium potassium and glucose
What happens at the first proximal convoluted tubule
Key molecules are reabsorbed
What substance are in the glomerular filtrate
Small molecules
How does the kidney know how much water to reabsorb back into the kidney
Message from brain to the kidney
Detected by the osmoreceptors
If the water potential is normal it will remain same
If the water potential in the blood decreases - dehydrated
ADH is realsed if there is too less
Water is reabsorbed back into the blood from the distal tubule
Small conc in the urine that’s produced.
What helps the anti- diuretic hormone (ADH) helps the kidneys regulate the water content in the blood
The brain monitors whether there is too much water in the blood
So little ADH is released
Dilute urine is excreted because the kidney tubules do not absorb much water to pass in back to the blood
If there is too little water in the blood then more ADH is released causing concentration urine to be excreted because the kidney tubules absorb a lot of water she pass it into the blood
How is osmoregulation used in homeostasis if the water potential rises
Water content in the blood increases so water potential increases
Detected by the osmoreceptors in the hypothalamus
The pituitary gland releases less ADH
Less ADH means less water in reabsorbed in the blood
Large amount of dilute urine
State a reason for an increase in the concentration of urea and mineral salts between points a and b
Water has been reabsorbed back into the blood
What is the evidence in the graph that the person was secreting antidiuretic hormone (ADH)
ADH increases - more water reabsorbed
And as the conc is increasing in the collecting duct the water is being reabsorbed back into the blood which means the ADH is more permeable
