Nat5 Biology Unit 2 Multicellular Organisms Key Area 7 Absorption Of Materials

Question 1

What needs to be absorbed into the bloodstream and why?

Answer 1

Oxygen and nutrients from food need to be absorbed into the bloodstream to be delivered to cell for respiration

Question 2

What is a waste material that needs to be removed from the cells into the bloodstream?

Answer 2

Carbon Dioxide

Question 3

What is a capillaries function?

Answer 3

To allow the exchange of materials at a cellular level

Question 4

What are the features that surfaces involved in absorption of materials share? What is their purpose?

Answer 4

They all have:
A large surface area
Thin walls
An extensive blood supply
They increase the efficiency of absorption

Question 5

What is an example of a gas exchange organ?

Answer 5

The lungs

Question 6

What makes the Lungs good gas exchange organs?

Answer 6

They have a large number of alveoli giving a bigger surface area for gas exchange

Question 7

What’s substances are absorbed through the alveoli? Where do they come from and where do they go?

Answer 7

Oxygen and Carbon dioxide are absorbed through the THIN alveolar walls to OR from the many blood capillaries in the body

Question 8

Where are nutrients absorbed in the body? What are the benefits?

Answer 8

They are absorbed through the villi in the SMALL intestine

The large number of thin walled villi provide a large surface area for absorption of materials

Question 9

What does each villus have?

Answer 9

A network of CAPILLARIES to absorbs glucose and amino acids and a LACTEAL to absorbs fatty acids and glycerol

Question 10

Describe the structure of the villus

Answer 10

The surface layer - The Epithelial Cells
The Capillaries (The cage thing)
The lacteal
The blood vessel (at the bottom the end things)

Question 11

Definition of Digestion

Answer 11

The breakdown of LARGE, INSOLUBLE molecules to SMALL, SOLUBLE molecules that can be absorbed through the small intestine into the bloodstream