ageing
- Created by: cvburgoyne
- Created on: 21-03-15 15:19
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- Effects of ageing
- Basal metabolic rate
- Definition: The rate at which we use energy to keep ourselves alive whilst at rest, but not asleep
- Decreases during ageing as fewer metabolically active cells
- explains obesity if old people do not exercise
- Conditions: lying down in the warmth, not eaten for 12 hours
- Cardiac output
- = stroke volume x bpm
- Decreases as we age because cardiac muscle cells become smaller and may die
- especially likely if old person does not exercise
- Nerve conduction velocity
- Neurones die as people age and are not replaced
- The speed at which impulses pass along neurones decreases
- myelin sheath becomes thinner so more ions leak out affecting potential difference
- Snapses produce less neuro-transmitter
- Basal metabolic rate
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