GAS EXCHANGE IN ORGANISMS YEAR 12

Name the structure through which gases enter and leave the body of an insect.

• tracheoles

• alveoli

• spiracle

• lungs

Name the small tubes that carry gases directly to and from the cells of an insect

• tracheoles

• system

• spiracle

• alveoli

Tubifex worms are small, thin animals that live in water. They have no specialised gas exchange or circulatory system. Name the process by which oxygen reaches the cells inside the body of a tubifex worm.

• active transport

• respiration

• diffusion

• facilitated diffusion

In this word equation for respiration, what is y representing?

Glucose + x --> y + water + energy

• carbon dioxide

• methane

• oxygen

• ATP

Which adaptations help reduce water loss in insects? (tick all that apply)

• guard cells that open and close the spiracles

• valves that open and close the spiracles

• hairs around the spiracles

What is meant by a counter-current system?

• A short distance for gases to diffuse

• When water flows in an opposite direction to blood flow

• having a higher concentration inside the lungs than outside

As the size of an organism increases its surface area to volume ratio increases

• True

• False

What are the smaller tubes (plural) that branch from the tracheae in insects called?

By which process in oxygen transported into cells?

When would there be more fluid at the end of tracheoles?

• When the muscle is active

• When the muscle is resting