M:3 S:1 Ventilation in Mammals
Exchange and Transport
- Created by: JessicaMPascoe
- Created on: 14-03-19 10:48
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- Ventilation in Mammals
- Inspiration
- Volume of thorax ^
- Diaphragm _______
- Pressure decreases
- Ribcage ^ and < >
- Air Floods into lungs
- Intercostal muscles contract
- Expiration
- Volume decreases
- Diaphragm domes
- Pressure ^
- Ribcage down and ><
- Air floods out of lungs
- Intercostal muscles relax
- KEY TERMS
- BREATHING RATE
- How many breaths are taken
- VITAL CAPACITY
- Max vol of air that can be breathed in or out
- DIAGRAM
- BREATHING RATE
- Spirometer
- Investigates breathing
- 1. Oxygen filled chamber with moveable lid
- 2. Person breathes through tube
- 3. Lid moves ^ and down when person is breathing in/out
- 4. Movements recorded by pen attached to lid
- Writes on rotating drum
- Spirtometer trace
- Produces electronic signals, picked up by a data logger
- Spirtometer trace
- Writes on rotating drum
- 5. Soda lime in tube absorbs CO2 breathed out
- DIAGRAM
- Analysing data from a spirometer
- Graph
- Breathing rate = peaks on graph
- Tidal Volume = difference in a peak and trough
- Vital Capacity = difference in peak and trough of deep breath
- Oxygen uptake = gradient of slope in time given
- Graph
- QUESTIONS
- 1. What is meant by tidal volume and vital capacity?
- 2. Describe how a spirometer can be used to measure oxygen uptake
- 3. Describe the changes that take place in the human throax during inspiration
- Inspiration
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