Why do multicellular organisms need specialised exchange surfaces?

why don't unicellular organisms need special exchange surfaces?

What are the features of an efficient exchange surface?

What is an exchange surface?

give 3 examples of specialised exchange surfaces.

What are the features of a efficient exchange surface?

What are the features of a mammalian lung that adapt it to efficient gas exchange?

How is a thin barrier in the lungs created?

Outline the mechanism of inspiration.

Outline the mechanism of expiration.

Where can cartilage be found?

Where can ciliated epithelium be found?

Where are goblet cells found?

Where is smooth muscle and elastic fibres found?

What are the functions of cartilage?

What are the roles of smooth muscle?

What is the roles of elastic fibres?

What is the role of the goblet cells (glandular tissue)?