Unit 1 AOS 2 SAC 5 revision

Gaseous exchange in the lungs involves the movement of:

 

• CO₂ from the alveoli into the capillaries and O₂ from the capillaries into the alveoli

• Air from the bronchioles via the pharynx and larynx to the alveoli

• H₂O from the capillaries to the alveoli and O₂ alveoli to the capillaries

• O₂ from the alveoli to the capillaries and CO₂ from the capillaries to the alveoli

When the body starts physical activity there is an immediate __________ in demand for __________to muscles

           

• Decrease, oxygen

• Increase, LA

• Increase, oxygen

• Increase, ATP-PC

Arterio – Venous oxygen difference (A-VO2 diff) is greatest during:

 

• Maximal exercise

• Sub-maximal exercise

• Rest

• None – it remains constant

Ventilation is:

    

• The number of breaths taken in one minute

• The amount of air breathed in and out in one breath

• The amount of air breathed in and out in one minute

• The movement of air from the external environment into the lungs

The volume of blood pumped out of the left ventricle each beat is referred to as:

 

• Cardiac Output

• Heart Rate

• Stroke Volume

• Tidal Volume

During exercise, an individual’s heart rate and the force of their heart’s contractions are increased. As a result, there is

 

• no change in systolic blood pressure.

• a decrease in systolic blood pressure.

• an increase in systolic blood pressure.

• a large decrease in diastolic blood pressure.

VO2 maximum is the product of:

 

• cardiac output (L/min) and tidal volume (L).

• cardiac output (L/min) and arteriovenous oxygen difference (mL/100 mL).

• stroke volume (mL/beat) and heart rate (bpm).

• tidal volume (L) and arteriovenous oxygen difference (mL/100 mL).

On the graph, area A indicates the period when:

• post-exercise oxygen consumption is in excess of resting levels.

• oxygen supply does not equal oxygen demand.

• oxygen supply equals oxygen demand.

• oxygen uptake is at resting levels.

The graph above represents oxygen consumption during and after exercise. The area indicated by the letter A is known as:

• excess post-exercise oxygen consumption (EPOC)

• oxygen deficit.

• oxygen debt.

• steady state.

The graph represents oxygen consumption during and after exercise. Identify EPOC on the graph.

• A

• B

• C

• D