Biology Topic 1

Circulatory System, Diet and Health

What does a mass transport system require?

A movement network, a transport medium, a pump such as the heart

What does an organism have a transport system?

Diffusion alone is not sufficient to meet their metabolic needs, it may be too large for only diffusion to take place

What type of molecule is water?

A polar molecule, due to uneven distribution of charge

Describe the charges on a water molecule

The hydrogen atoms have a slight positive charge and the oxygen atom has a slight positive charge

What type of forces can water experience?

cohesion and adhesion