★ Human Body Systems Quiz
What important substance is replenished as blood flows through the heart?
A. iron
B. nitrogen
C. water
D. oxygen
Select your answer:
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Infectious Disease › ViewWhat is the main Mode of Transmission for COVID 19?
A. Vehicle
B. Contact
C. Airborne
D. Vector
Anatomy & Physiology: Respiratory › View
Oxygen enters the blood at the lungs because
A. The partial pressure of oxygen is higher in the blood than in the alveoli.
B. The partial pressure of oxygen is lower in the blood than in the alveoli.
C. Oxygen is attracted to the negative charges of plasma proteins.
D. Low blood pressure does not oppose oxygen movement.