Which is NOT an anatomical structures of the CV system?
Which blood vessels carry blood to or from the lungs?
superior vena cava
When the heart is in systolic phase it is contracting, true or false?
What is the pacemaker of the heart?
Bundles of His
What causes a delay in the electrical activation of the heart?
Bundle of His
Which section of the blood vessel contains the smooth muscle?
How many cells thick are capillaries?
How do veins aid venous return to the heart?
non return valves
thick tunic media
muscles squeeze blood back towards the heart
How are erythrocytes designed to carry O2?
high heamoglobin content
Move in ameboid fashion
Approximately what is the hematocrit in humans?