The heart has how many layers of tissue?

The study of blood is called

Cardiology is defined as

How many pulmonary veins return oxygenated blood to the atriums?

The internal jugular vein empties into the

Which of the following make up the two lower chambers of the heart?

Select all that apply. Granulocytes

That portion of the circulatory system that conveys blood from the heart to the lungs and returns it to the heart is identified by the term

The blood cells which contain hemoglobin are the

The internal carotid artery is the main blood supply to the