What is the respiratory system used for?

What is the cardiovascular system used for?

What is the coloured structure in the diagram?

What is the coloured structure in the diagram above?

In humans, gas exchange only occurs in the alveoli. The rest of the respiratory system just transports air in and out of the alveoli.

Does air have a higher concentration of oxygen before it is inhaled into the lungs, or after it is exhaled from the lungs?

Recall the name of the heart chambers that receive blood from the veins.

Name the heart chamber that contracts to push blood into the arteries.

Shaan has come across this labelled blood vessel in the diagram below. It is an artery that receives blood from the right ventricle, and leads towards the lungs.

The concentration of oxygen is higher outside of the cell than inside the cell.

State where the oxygen will move

Sugars dissolved in water are in high concentration outside of the cell, but low concentration inside the cell.

State where the water will move.

Sugars dissolved in water are in high concentration outside of the cell, but low concentration inside the cell.

State where the water will move.

There is a high concentration of waste products dissolved in water inside the cell.

State where the water will move.

Salt particles dissolved in water are at equal concentrations inside and outside of the cell.

State where the water will move.

Select the correct term for the following definition:

"Nerve cells that carry messages from the CNS to effectors"

Select the correct term for the following definition:

"Nerve cells that carry messages within the CNS"

Select the correct term for the following definition:

"Nerve cells that carry messages from receptors to the CNS"