Exchange Surfaces - Respiratory System

Which of the following is a main feature of an exchange surface?

• Thick

• Dry

• Small Surface Area: Volume Ratio

• Permeable

Why is a large SA:V so important for respiratory system exchange surfaces?

• Reduces the amount of CO2 transported

• Increases O2 released by the lungs when you breathe out

• Increases efficiency of diffusion

• Increases efficiency of osmosis

Diffusion is:

• Passive movement of molecules from a region of high concentration to a region of low concentration

• Active movement of molecules from a region of high concentration to a region of low concentration

• Passive movement of molecules from a region of low concentration to a region of high concentration

• Active movement of molecules from a region of low concentration to a region of high concentration

The function of an exchange surface is:

• To allow the passage of O2 molecules into and CO2 molecules out of the body system

• To prevent the passage of O2 molecules into and CO2 molecules out of the body system

• To allow the passage of CO2 molecules into and O2 molecules out of the body system

• To prevent the passage of O2 molecules into and CO2 molecules out of the body system

Where does gas exchange in the respiratory system occur? (Choose most correct answer!)

• Trachea

• Alveoli

• Bronchioles

• Lungs

The role of the capillaries is to:

• Carry CO2 from the trachea around the body

• Carry CO2 from the Alveoli around the body

• Carry oxygen from the mouth around the body

• Carry oxygen from the Alveoli around the body

Where does gas exchange occur in the leaf?

• Spongy mesophyll

• Stomata

• Upper epidermis

• Palisade mesophyll

In the dark, the guard cells absorb water by osmosis, become turgid and the stoma opens.

• True

• False

Plants respire during the day and night, but they only photosynthesise during the day when it is light

• True

• False

C6H12O6 + 6O2 → 6CO2 + 6H2O is the chemical equation for:

• Transpiration

• Photosynthesis

• Aerobic respiration

• Anaerobic respiration