What is the
largest
component of blood?
A. Plasma
B. Platelets
C. Neutrophils
D. Erythrocytes
Which one of the following statements is incorrect.
A. In humans arteries carry blood from the heart.
B. In humans all blood vessels called "veins" carry deoxygenated blood
to the heart.
C. Oxygen binds to heme.
D. Epinephrine secreted by the adrenal gland increases heart rate.
Identify the correct actions (only one answer is correct):
A. At diastole blood flows into the right atrium and then out of the
left ventricle
B. At diastole blood flows into the right and left atria and
simultaneously out of the right
and left atria to the right and left ventricles.
C. At systole blood flows out of the heart from the two ventricles and
incoming blood to
the atria is stopped.
D. The sinoatrial node fires which then activates the Purkinje fibers.