The production of blood cells is called ____________________ and occurs in ____________________.

This passageway is a shared organ of the respiratory and digestive systems:

After years of breathing in harmful chemicals at work, Alex has been told that his lungs have too few alveoli.  Predict the effect:

A small amount of bacteria used to start a new culture is called a/an _______.

This passageway is a shared organ of the respiratory and digestive systems:

Predict the effect of increased levels of carbon dioxide on the rate and depth of respiration:

Normal blood is at least 50% saturated with oxygen.

This white blood cell produces antibodies that attach to microorganisms:

This white blood cell becomes a macrophage and is most effective with chronic bacterial infections:

This white blood cell destroys parasitic worms by releasing toxic chemicals onto its membrane: