Respiratory System

Diffusion is:

• Movement of gas molecules from high concentration to low concentration.

• Movement of gas molecules from a low concentration to a high concentration.

• Movement of gas from one area to another area.

• Movement of oxygen from the air into the blood.

Alveoli enable diffusion due to...

• Thick walls, small lumen and elastic.

• Small surface area, good blood supply, one cell thick

• Large surface area, one cell thick and good blood supply

Diffusion pathway of oxygen is...

• Alveoli, blood, muscles

• Muscles, blood, alveoli

• Muscles alveoli, blood

• Blood, Alveoli, muscles

Diffusion pathway of CO2 is:

• Alveoli, blood, muscles

• Muscles, blood, alveoli

• Muscles, alveoli, blood

• Blood, alveoli, muscles

Residual volume is...

• Amount of air left in the lungs after maximal expiration

• Volume of air breathed in or out per breath

• Volume of air forcibly inspired after normal breath

• Volume of air breathed in or out per minute

Residual volume does what during the exercise?

• Increases

• Decreases

• Stays the same

Tidal Volume is...

• Volume of air breathed in or out per breath

• Volume of air forcibly inspired after normal breath

• Amount of air left in the lungs after maximal expiration

• Volume of air breathed in or out per minute

Oxyhaemoglobin dissociation is when...

• Oxygen joins with haemoglobin.

• Oxygen attached to haemoglobin in four different locations.

• Oxygen combine to the mitochondria.

• Oxygen dissociates from haemoglobin and moves down a pressure gradient to the myoglobin.

What is partial pressure?

• The pressure a gas exerts in a mixture of gases.

• The movement of gas from a low concentration to a high concentration.

• The movement of gas from a high concentration to a low concentration.

• When there is a difference in neighbouring or adjoining pressures.

What is pressure gradient?

• The pressure a gas exerts in a mixture of gases.

• The movement of gas from a low concentration to a high concentration.

• The movement of gas from a high concentration to a low concentration.

• When there is a difference in neighbouring or adjoining pressures.