GASEOUS EXCHANGE

Which of the following is true about respiratory structure?

• It is moist

• It is highly vascularized

• It has large surface area

• It is very thick

Identify the structure.

• Gills

• Gill filament

• Gill filaments

• Gill

Identify part labelled A.

• Gill bar

• Gill rakers

• Gill filament

• Gill bars

Name part marked B

• Gill rakers

• Gill raker

• Gill bar

• Gill bars

Name part marked A.

• Stomata

• Nucleus

• Stoma

• Epidermal cell

Identify B

• Nucleolus

• Chloroplast

• Epidermal cell

• Sap vacuole

Name the phenomenon illustrated in the diagram shown

• Current flow

• Counter current flow

• Current counter flow

• Gaseous exchange

What is the significance of counter current flow?

• It prevents blood and water from mixing

• To create a steeper concentration gradient

• To prevent Oxygen and Carbon (IV) oxide from mixing

• To remove Nitrogen gas

Which of the following is not true during inhalation?

• Diaphragm flattens

• External intercostal muscles contract

• Internal intercostal muscles relax

• Volume of thoracic cavity decreases

Which of the following is not true during exhalation?

• Diaphragm flattens

• External intercostal muscles relax

• Internal intercostal muscles contract

• Volume of thoracic cavity decreases