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9 Cards in this Set
- Front
- Back
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Measuring your own breathing rate could affect your breathing rate. Explain why. |
• Conscious of it, so we may sub-consciously attempt to slow/quicken it, due to awareness of it being measured |
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When you measure your breathing rate, you shouldn't breathe in and out deeper than you normally would. Why? |
• In order to obtain realistic and reliable results that are representative of the true values. • To see real correlations and patterns when plotted on an appropriate graph. |
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What was the purpose of holding your breath for 10 seconds in the first trial? |
As a control for comparison and standardisation of results, as it allows anomalies to be highlighted. |
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Give 2 reasons why the method to calculate breathing rate was not good? (Measured for 30 secs x2). |
• Not reliable, as breathing rate may fluctuate more over the period of a full minute. • Mathematical errors in calculations may give inaccurate results. • Human error in counting over the 30 second period. |
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Calculate pulmonary ventilation? |
PV = Tidal volume × Respiratory rate (breathing rate) |
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You use PH indicator on a solution from another student and it's PH indicator is 5. How does the body respond to this PH in the blood? |
1) Chemo receptors in walls of aorta and carotid arteries detect the change in PH. 2) Impulses sent along SNS (sympathetic nervous system). 3) These secrete noradrenaline at synapse, which bind to receptors on SAN. 4) SAN then sends out more frequent impulses to cardiac muscles. 5) HR increases to return PH levels back to normal (4.4), by rejoicing CO2 from the blood and lungs. |
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Why is it important that blood PH levels remain constant? |
Blood PH needs to be under homostatic control, as it affects the net charge on ions and amino acids, such as the active site on enzymes (change shape of binding site), so no enzyme substrate complexes can be formed and reduces metabolic rate of reaction so needs to stay at optimum. |
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Why are you told not to hold your breath for more than 40 seconds? |
Holding your breath for an extended period of time leads to a build up of CO2. This can cause the heart rate and blood pressure to increase. This would affect the outcome of the experiment. |
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Confusion is an indicator of CO2 poisoning, is this a good indicator? |
• No, because confusion is subjective. It can be caused by and is a symptom of other conditions and situations. • Yes, because it is known as a common symptom of CO2 poisoning. |
