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