This was on the BaP Science Listserve, please post or forward to your science teachers:

Circulatory System and Heart Activities:

Circulation Blood – The Blood Vessel
Blood Circulation Through the Heart and Lungs:
Blood Vessels Labeling Page
Heart and Lungs Labeling Pages

Respiratory System:

Respiratory System
Alveoli, Alveoli ducts, Respiratory Bronchioles (Respiratory Zone)
Nose, Pharynx, Larynx, Trachea, Bronchi, Bronchioles (Conduction Zone)
The Lungs
The Respiratory System
Note:  Curriki is a good teacher resource, requires registration, free to register