Gaseous Exchange

What is diffusion?

• the active movement of a substance against its concentration gradient

• the net movement of a substance from an area of low to higher concentration

• the net movement of a substance from an area of high to lower concentration

• the passive movement of a substance against its concentration gradient

Where does gaseous exchange occur in mammals?

• alveoli

• villi

• small intestine

• heart

How are alveoli adapted for gaseous exchange?

• they provide a long diffusion pathway between the lungs and the blood

• they are in close contact with the lung capillaries

• their walls are made up of multiple cell layers

• they have a small surface area for diffusion

Which of these is NOT an adaptation of leaves for gaseous exchange?

• they are flat to increase the surface area

• they have internal airspaces next to cells

• they have small holes on their surface called stomata

• they are thick to maximise diffusion pathway

Tags

NGSS.MS-LS1-6

Through what organ does air move into the lungs?

• the trachea

• the alveoli

• the diaphragm

What are the tiny air sacs in the lungs called?

• Ravioli

• Bronchioles

• Alveoli

What are the products of aerobic respiration?

• Carbon dioxide and water

• Lactic acid

• Oxygen and glucose

Tags

NGSS.MS-LS1-7

Where does respiration happen?

• Cell membrane

• Mitochondria

• Nucleus

Tags

NGSS.MS-LS1-7

What does the trachea divide into?

• Alveoli

• Two bronchi

• Bronchioles

What happens to the diaphragm when you breathe in?

• Contracts and moves upwards

• Relaxes and moves downwards

• Contracts and moves downwards