8D Organisms
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What causes us to breathe in and out?
The brain controls movements in the chest.
Describe what occurs to the diaphragm during inhalation.
Contracts and flattens
Describe what occurs to the diaphragm during exhalation.
Relaxes and moves up
Describe what happens to pressure in the chest cavity during inhalation.
Pressure decreases
Describe what happens to pressure in the chest cavity during exhalation.
Pressure increases
What does the bell jar model represent?
The breathing system of an animal
Identify what the rubber sheet represents in the bell jar model.
The diaphragm
Describe what happens to the balloon in the bell jar model when the rubber sheet is stretched.
The balloon inflates
Define the term vital capacity/ lung volume.
The amount of air you can breathe out in a single breath
Name 2 ways of measuring lung volume
Blowing air into an upturned basin of water and Lung volume bags
Define the term independent variable.
The variable that we change.
Identify the students’ dependent variable in their investigation.
The vital capacity
What are the control variables in the student’s investigation?
Same age of pupils, same type of lung volume bags.
What is a hypothesis?
An idea of the outcome of an experiment
Describe the trend shown in investigation 2.
As height increases lung volume increased
Identify the height and lung capacity of the smallest adult male from investigation 2.
110cm height 1 litre lung capacity
Define the term vital capacity/ lung volume.
The amount of air you can breathe out in a single breath
Name 2 ways of measuring lung volume
Blowing air into an upturned basin of water and Lung volume bags
Define the term independent variable.
The variable that we change.
Identify the students’ dependent variable in their investigation.
The vital capacity
What are the control variables in the student’s investigation?
Same age of pupils, same type of lung volume bags.
What is a hypothesis?
An idea of the outcome of an experiment
Describe the trend shown in investigation 2.
As height increases lung volume increased
Identify the height and lung capacity of the smallest adult male from investigation 2.
110cm height 1 litre lung capacity