Respiratory System

Goblet cells

and cilia are found in trachea and bronchi.

microbes

Goblet cells and cilia protect alveoli in the lungs from inhaled dust and .

bronchioles

The walls of the trachea, bronchi and are lined with smooth muscle which can contract and relax.

Trachea

is a tube lined with C- shaped supporting rings.

waste

The respiratory system also removes such as carbon dioxide.

smooth muscle

During exercise, will relax which causes airway to expand and allows more air to flow through them.

smooth muscle

Contracting ________ is a cause of asthma.

Goblet cells

produce sticky mucus which traps them.

Smooth muscle

will contract if toxic gas is present to restrict airflow by narrowing the airways.

Inspiration

Breathing in is known as _

Expiration

Breathing out is known as __

nasal cavity

As the air passes through the _ it is warmed slightly.

trachea

Air must pass through the

cartiliage

The C shaped supporting rings are made out of _

expand

The trachea will to let more air in

diffusion

Gas exchange happens in the alveoli by _

moist lining

Oxygen dissolves in the __ so it can diffuse into the blood

concentration gradient

Large capillary network maintains diffusion and _

diffusion

Large surface area increases

Thin

walls means there is a short diffusion distance