Chapter 2.6c The need for transport in animals: gas exchange and nutrient absorption Flashcards Preview

FULL COURSE National 5 Biology > Chapter 2.6c The need for transport in animals: gas exchange and nutrient absorption > Flashcards

Flashcards in Chapter 2.6c The need for transport in animals: gas exchange and nutrient absorption Deck (12)
Loading flashcards...
1
Q

Airways that link the atmosphere with gas exchange surfaces within the lungs are kept open with rings of

A

cartilage

2
Q

Most of the main airways are lined with sticky

A

mucus which traps dirt particles preventing these from reaching the gas exchange surface

3
Q

The mucus and trapped material in the airways are swept out of the lings by the movement of small hairs called

A

cilia

4
Q

The gas exchange surfaces are composed of thin-walled sacs called

A

alveoli

5
Q

Alveoli have a rich blood supply and form a

A

large surface area for efficient gas exchange

6
Q

Oxygen and carbon dioxide are exchanged by diffusion between the air and the blood through

A

the thin walls of the alveoli

7
Q

Swallowed food is moved through the digestive system by a muscular action called

A

peristalsis

8
Q

Digested food is absorbed through the small intestine wall and into the blood and

A

lymph

9
Q

The small intestine wall has thin walled folds called

A

villi which increase its surface area for absorption of digested food

10
Q

Each villus has a good blood supply and a central lymph vessel called a

A

lacteal

11
Q

Glucose and amino acids are absorbed directly into the bloodstream whereas the products of fat digestion pass into the

A

lacteals

12
Q

Lacteals lead into the

A

lymphatic system