3 Responses Respiratory System

Which of the following best describes the main function of the respiratory system during a single session of sport or exercise?

• To increase the production of red blood cells

• To supply oxygen to the muscles and remove carbon dioxide

• To regulate body temperature

• To digest nutrients more efficiently

What is the primary chemical factor that controls breathing rate during exercise?

• Oxygen concentration in the blood

• Blood glucose levels

• Carbon dioxide concentration in the blood

• Lactic acid concentration

Which part of the brain is mainly responsible for the neural control of breathing?

• Medulla oblongata

• Cerebellum

• Hypothalamus

• Cerebrum

Which muscle is the primary muscle involved in inspiration during exercise?

• Rectus abdominis

• Diaphragm

• Biceps brachii

• Trapezius

Which of the following is an additional skeletal muscle that aids breathing during intense exercise?

• Quadriceps

• Sternocleidomastoid

• Gastrocnemius

• Diaphragm

What happens to tidal volume during a single session of vigorous exercise?

• It decreases

• It remains the same

• It increases

• It fluctuates randomly

Minute volume (VE) is defined as:

• The amount of air left in the lungs after exhalation

• The volume of blood pumped by the heart per minute

• The amount of oxygen used by the muscles per minute

• The total volume of air inhaled or exhaled per minute

• It decreases

• It remains unchanged

• It increases

• It becomes zero

Which of the following best describes the oxygen dissociation curve?

• A graph showing the relationship between heart rate and exercise intensity

• A graph showing the relationship between partial pressure of oxygen and haemoglobin saturation

• A graph showing the relationship between breathing rate and tidal volume

• A graph showing the relationship between blood pressure and cardiac output