★ Circulatory System Quiz
What allows blood to move from the atrium into the ventricles?
A. Pumping of the heart muscle
B. passing through the aorta
C. opening of a valve
D. closing of pulmonary artery
Select your answer:
Topics:
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Eye Histology › ViewWhat is responsible for suspending the lens?
A. Non-photosensitive retina present over the ciliary body
B. Cytoplasmic extensions of the iridial stroma
C. Zonules of the iris
D. Zonules of the ciliary body
Cell Transport › View
a substance passing through a membrane without the aid of a membrane protein
A. diffusion
B. osmosis
C. facilitated diffusion