Internal Systems

Question 1

What is the pathway of circulation? (11 steps)

Answer 1

Deoxygenated blood enters from the right atrium of the heart
Contraction of the right atrium forces blood into the right ventricle
Right ventricle contracts to force blood through the pulmonary arteries to the lungs (oxygen diffuses into the blood)
Oxygenated blood enters the left atrium through the pulmonary vein
Left atrium contracts to squeeze blood into the left ventricle
Left ventricle contracts to force blood out the aorta
This branches into major arteries to carry blood through the body
As blood moves around, oxygen diffuses out
After passing through, the deoxygenated blood enters the venules, then to the veins
Inferior vena cava and superior vena cava enter the right atrium of the heart
Cycle starts again

Question 2

Composition of blood?

Answer 2

Plasma
Red blood cells - Transport
White blood cells - Protection
Platelets - Protection