heart
The heart
The cadiovascular system, sometimes called the circulatory system when it includes the lymphatic system.
the heart
The heart <3
the circulatory system and the respiratory system are the names
Cardiovascular system.
Lymphatic System
an open circulatory system
Open circulatory system!
I think is because the circulatory system of a reptile has the ability to redirect deoxygenated blood from the lungs to save energy.
closed circulatory system
The circulatory system.
Material moves from the respiratory system to the circulatory system by diffusing across a membrane in the air sacks called alveoli.