Topic 3 : Cardio and Respiratory Adaptations Quiz

What happens to pulmonary ventilation during submaximal intensity exercise?

• It increases

• It decreases

• It stays the same

• It stops

Answer explanation

Pulmonary ventilation decreases during submaximal exercise due to more efficient respiratory function.

At maximal intensity, what causes the increase in pulmonary ventilation?

• Increase in tidal volume and respiratory frequency

• Decrease in oxygen extraction

• Increase in blood pressure

• Decrease in heart rate

Answer explanation

Both tidal volume (amount of air per breath) and respiratory frequency (breathing rate) increase to meet the higher oxygen demands at maximal intensity.

Pulmonary diffusion is unchanged during which of the following?

• Rest and submaximal intensity

• Maximal intensity

• Submaximal and maximal intensity

• All exercise levels

Answer explanation

Pulmonary diffusion remains stable at rest and submaximal intensity but increases at maximal intensity due to higher lung perfusion.

What happens to the arterial-venous O2 difference during maximal exercise?

• It increases

• It decreases

• It remains the same

• It fluctuates

Answer explanation

More oxygen is extracted by the muscles during maximal exercise, increasing the arterial-venous O2 difference.

What type of heart change is referred to as cardiac hypertrophy?

• Increased heart rate

• Decreased stroke volume

• Enlargement of heart chambers

• Increase in heart capillarization

Answer explanation

Cardiac hypertrophy involves an enlargement of the heart chambers, particularly the left ventricle, improving its ability to pump blood.

What is the relationship between stroke volume (SV) and heart rate (HR)?

• SV increases as HR increases

• SV decreases as HR increases

• Cardiac output = SV × HR

• HR and SV are unrelated

Answer explanation

With aerobic training, the heart's left ventricle increases in size, allowing it to pump more blood per beat (stroke volume).

Which factor leads to increased stroke volume during aerobic training?

• Increased resting heart rate

• Increased ventricular volume

• Decreased blood volume

• Decreased blood pressure

Answer explanation

Cardiac output is the product of stroke volume and heart rate, representing the volume of blood the heart pumps per minute.

Which of the following describes a cardiovascular adaptation to aerobic training?

• Increased blood viscosity

• Increased capillarization of the muscles

• Increased blood flow to the lungs

• Decreased plasma volume

Answer explanation

Aerobic training leads to increased capillarization in the muscles, improving oxygen delivery and waste removal.

What happens to heart rate recovery after aerobic training?

• It becomes slower

• It remains unchanged

• It becomes faster

• It stops after maximal exercise

Answer explanation

Trained individuals have faster heart rate recovery, meaning their heart rate returns to normal more quickly after exercise.

How does aerobic training affect blood viscosity?

• Increases it

• Decreases it

• No change

• Varies based on intensity

Answer explanation

Aerobic training decreases blood viscosity, allowing for more efficient blood flow.