The tricuspid valve prevents blood from:
A) moving between the right and left ventricles.
B) flowing from the right ventricle into the right atrium.
C) bypassing the pulmonary vessels and entering the right heart.
D) flowing backward through the left atrium.
Question 2
You are responding to an emergency call but the traffic is at a standstill and vehicles are unable to clear a path for you to move through. You should:
A) turn your lights and sirens off and wait for traffic to move.
B) continue to sound your horn to get the traffic moving.
C) try to back up or turn around and find another route.
D) very carefully nudge some cars out of your path.
Alzheimer's Gene Causes Brain's Blood Vessels to Leak Toxins and Die
blood close up
The Primate order displays a diversity of ways of moving around.
identical (left) and fraternal (right) twins
Blood Flow to the Brain
Ventricles and the Choroid Plexus