The Nephron Unit 12: Assignment 1
Learning Outcomes To understand the process of ultrafiltration To begin to understand the process of Selective Reabsorption To know some signs of dehydration
http://www.youtube.com/watch?v=Z2PugQZFLR0
The Nephron
Ultrafiltration Filtering at a molecular level Glomerulus Bowman’s Capsule
Ultrafiltration Filtration of the blood to move substances into the nephron Filtered based on size Any molecule with a relative molecular mass of more than 69,000 will not be filtered.
Collagen Sodium Immunoglobulin Water Haemoglobin Urea Glucose Glycine Task: Molecule Size List these atoms/molecules in order of size and decide which will / will not be filtered at the glomerulus: Collagen Sodium Immunoglobulin Water Haemoglobin Urea Glucose Glycine
Molecule Size and Filtration The following passes through from the blood to the nephron: Water Salts (Na,K,Cl) Glucose Urea Small Amino Acids
Selective Reabsorption Ultrafiltration is non selective (i.e. any molecule small enough is filtered) Some substances are needed in the body so must stay in the bloodstream These molecules are reabsorbed from the proximal convoluted tubule into the blood.
Secretion / Absorption Secretion: Substances moving from blood to nephron. Absorption: Substances moving from nephron to blood.
Which are needed in the blood? Fill in the table: Substances needed in the blood: Substances to be excreted in the urine:
Which are needed in the blood? Fill in the table: Substances needed in the blood: Substances to be excreted in the urine: Glucose Urea Amino Acids Water Salts
Summarise the processes happening in the nephron: https://www.youtube.com/watch?v=8UVlXX-9x7Q
Dehydration: Definition?
Dehydration: List the symptoms of dehydration:
8 Common signs of dehydration https://www.youtube.com/watch?v=FuAoP0BpGGk Take notes, I’ll test you afterwards!!
Class Work Task: Complete your labelled Nephron diagram for your pass criteria. Use text books to research and make notes on: Osmoregulation Dehydration 3) Begin producing a booklet on Dehydration