-In the figure, what is item number 4?
Definitions:
Right Atrium
The upper right chamber of the heart that receives deoxygenated blood from the body through the vena cavae.
Right Ventricle
The chamber within the heart that pumps deoxygenated blood to the lungs through the pulmonary artery.
Limbs
Appendages of the body, such as arms and legs, used for movement and manipulation of the environment.
Megakaryocytes
Large bone marrow cells that produce platelets, which are crucial for blood clotting.
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