Homeostasis

• Negative feedback 


  a mechanism in order to maintain balance and return to ideal values
• Endocrine tissue 


  secretes hormones directly into the bloodstream
• Exocrine tissue 


  secretes enzymes through passageways to target organs
• alpha cells in pancreas


  secretes glucagon
• beta cells in pancreas


  secretes insulin
• osmoregulation


  maintaining constant osmotic pressure to balance the concentration of solutes and water
• excretion 


  removing toxic substances from the body (through sweat, urine, feces)
• kidney function


  removes waste products in blood and to maintain bloods balance of water and solutes
• nephrons 


  tiny tubules in each kidney which is responsible for formation of urine
• parts of the cortex

  • glomerulus
  • bowmans capsule
  • proximal convoluted tubule and distal convoluted tubule
• medulla 


  • loop of henle
  • collecting duct
• renal pelvis 


  • connects to the bladder
• ultrafiltration

  small molecules will enter through the glomerulus and PCT where selected molecules pass through
• selective reabsorption 


  select few molecules are reabsorbed into the blood
• glomerulus function

  fenestrated capillaries that allow ultrafiltration, thus filtrate to be separated from the blood
• fenestrations function 


  promote high permeability
• loop of henle function


  • maintains concentration gradient of solutes in medulla
  • high osmotic concentration for ultrafiltration
• countercurrent multiplier system 


  what the hell
• vasa recta


  capillary near the loop of henle where the water and ions pass through