CHAPTER 8.1 (F4): RESPIRATORY SYSTEM IN ORGANISMS

Why do unicellular organisms like Amoeba not need a respiratory system?

• They use lungs

• They don’t need oxygen

• They have a large surface area to volume ratio

• They absorb oxygen from food

What is the main function of the respiratory system?

• Transport nutrients

• Break down food

• Exchange gases

• Produce energy

What is the respiratory structure for gaseous exchange in humans?

• Tracheole

• Lamella

• Alveolus

• Spiracle

Which structure allows gaseous exchange in insects?

• Gills

• Moist skin

• Lungs

• Tracheal system

What is the respiratory organ of a fish?

• Moist skin

• Trachea

• Gills

• Lungs

Which structure is responsible for gas exchange in frogs during rest?

• Nose

• Moist skin

• Mouth

• Gill

Why do large organisms need special respiratory structures?

• They breathe faster

• They have large TSA/V ratio

Which of the following is NOT a characteristic of efficient respiratory structures?

• Moist surface

• Thick walls

• High total surface area

• Rich in blood capillaries

Why is the alveolus wall thin?

• To absorb heat

• To slow down breathing

• To make gas exchange faster

• To trap dust

What is the role of blood capillaries in respiratory organs?

• To prevent diffusion

• To transport respiratory gases

• To moisten the surface

• To block harmful gases