vacuum pump; fume needs to assess what cupboard. level of exercise is appropriate and safe – 2) Introduce the too high a rate puts treatments for extra strain on the body cardiovascular diseases and may be harmful. in B5.25b of the specification. Ask Equipment: stopwatch, students to work digital heart monitor, together to compile the tape measure, height three most important measurer, bathroom questions they need scales answers to so they can compare the Digital: TBC effectiveness of different treatments. CB5d Pathogens B5.4 Describe a pathogen as a 1) Write the word Measure the growth of bacteria Explain that less than disease-causing organism 'pathogen' on the board in fresh milk kept at different 200 Cholera was including viruses, bacteria, and identify the first part temperatures for the previous common in cities and fungi and protists. from 'pathos' meaning 24 hours. All samples must be was thought to be feelings (i.e. suffer) and allowed to reach room caused by 'bad air'. Foul B5.5 'gen' meaning birth. Ask temperature before the smells came from Describe some common students what pathogens experiment begins. Resazurin cesspits where human infections, including: are and why they were dye should be freshly prepared waste collected under a cholera (bacteria) causes given that name from the just before the lesson. buildings before being diarrhoea root words. cleared away. So the The time taken for the dye to correlation between b tuberculosis 2) Write the names of become colourless should foul-smelling air and (bacteria)causes lung the four pathogen groups decrease as temperature disease seemed damage (bacteria, protists, fungi, increases, because obvious. bacteria) on the board microorganisms generally grow and ask students to write faster at higher temperatures. In 1854 there was an
vacuum pump; fume cupboard. 2) Introduce the treatments for cardiovascular diseases in B5.25b of the specification. Ask students to work together to compile the three most important questions they need answers to so they can compare the effectiveness of different treatments. needs to assess what level of exercise is appropriate and safe – too high a rate puts extra strain on the body and may be harmful. Equipment: stopwatch, digital heart monitor, tape measure, height measurer, bathroom scales Digital: TBC CB5d Pathogens B5.4 B5.5 Describe a pathogen as a disease-causing organism including viruses, bacteria, fungi and protists. Describe some common infections, including: a cholera (bacteria) causes diarrhoea b tuberculosis (bacteria)causes lung damage 1) Write the word 'pathogen' on the board and identify the first part from 'pathos' meaning feelings (i.e. suffer) and 'gen' meaning birth. Ask students what pathogens are and why they were given that name from the root words. 2) Write the names of the four pathogen groups (bacteria, protists, fungi, bacteria) on the board and ask students to write Measure the growth of bacteria in fresh milk kept at different temperatures for the previous 24 hours. All samples must be allowed to reach room temperature before the experiment begins. Resazurin dye should be freshly prepared just before the lesson. The time taken for the dye to become colourless should decrease as temperature increases, because microorganisms generally grow faster at higher temperatures. Explain that less than 200 Cholera was common in cities and was thought to be caused by 'bad air'. Foul smells came from cesspits where human waste collected under buildings before being cleared away. So the correlation between foul-smelling air and disease seemed obvious. In 1854 there was an