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Course: Edexcel A Level Biology A (SNAB) 9BI0
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Edexcel A Level Biology A (SNAB) 9BI0

Topic 1 · Lifestyle, Health and Risk

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Topic 2 · Genes and Health

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Topic 3 · Voice of the Genome

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Topic 4 · Biodiversity and Natural Resources

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Topic 5 · On the Wild Side

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Topic 6 · Immunity, Infection and Forensics

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Topic 7 · Run for your Life

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Topic 8 · Grey Matter

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Quiz

7.4.2 Practical- Investigating the Effects of Exercise – Exam questions

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  • Questions count: 12
  • Passing grade: B+
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1.

During exercise, heart rate increases because

the vagus nerve is stimulated
the cardiovascular control centre sends impulses along the sympathetic nerve to the SAN
CO₂ falls
blood pH rises
2.

Ventilation rate increases in exercise in response to

a rise in carbon dioxide concentration and a fall in blood pH
a fall in carbon dioxide
a rise in oxygen
a fall in temperature
3.

Too little exercise increases the risk of

wear and tear on joints
obesity, coronary heart disease and type 2 diabetes
suppressed immunity from overtraining
none of these
4.
After vigorous exercise, breathing rate stays high to:
Cool the lungs
Remove glucose
Make lactic acid
Repay the oxygen debt
5.
What is the cause of the cramps you feel in your muscles during strenuous exercise?
What is the cause of the cramps you feel in your muscles during strenuous exercise?
Lactic acid fermentation
Alcohol fermentation
Chemiosmotic coupling
Too much oxygen delivery to the muscles
Oxidative phosphorylation
6.

Lactate after exercise is

excreted in urine
stored in muscle permanently
converted back to pyruvate and oxidised, or converted to glycogen in the liver
converted to fat
7.

Cardiac output is

tidal volume × breathing rate
stroke volume × heart rate
blood pressure × heart rate
stroke volume ÷ heart rate
8.

Minute ventilation is

tidal volume × breathing rate
vital capacity × heart rate
stroke volume × breathing rate
tidal volume ÷ breathing rate
9.

The heart is described as myogenic because

it contracts without needing nervous stimulation
it has no muscle
it is controlled by hormones only
it needs the brain to beat
10.

The atrioventricular node

starts the heartbeat
pumps blood
delays the impulse so the atria finish contracting before the ventricles contract
closes valves
11.

On an ECG, the QRS complex represents

atrial depolarisation
ventricular repolarisation
atrial repolarisation
ventricular depolarisation
12.

A spirometer trace can be used to measure

blood pressure
cardiac output
tidal volume, breathing rate and oxygen consumption
heart rate
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Part of Topic 7 · Run for your Life — see every lesson and quiz in this unit.
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