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):
1

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

cartilage

2

Most of the main airways are lined with sticky

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

3

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

cilia

4

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

alveoli

5

Alveoli have a rich blood supply and form a

large surface area for efficient gas exchange

6

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

the thin walls of the alveoli

7

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

peristalsis

8

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

lymph

9

The small intestine wall has thin walled folds called

villi which increase its surface area for absorption of digested food

10

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

lacteal

11

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

lacteals

12

Lacteals lead into the

lymphatic system