★ Cardiovascular System Quiz
Which group of blood cells play a role in the body’s defense mechanism?
A. RBC
B. WBC
C. Platelet
Select your answer:

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Muscle Anatomy › ViewThe plasma membrane of a skeletal muscle cell is called the ________.
A. myofilament
B. sarcoplasmic reticulum
C. sarcoplasm
D. sarcolemma
Circulation of Blood › View
Upper chamber of the heart. Receives blood from the body & lungs.
A. Atrium
B. Artery
C. Ventricle
D. Valve