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_____________________ cells function by directly destroying viruses and cancer cells by poking holes in them.

Vaccines are examples of 

Which of the following acts to pump fluid through lymphatic vessels?

________________ can occur when oxygen supplies to cardiac muscle is reduced or cut off.

Your friend identifies a new bacterial species and they tell you that they named the organism Streptococcus. Hearing this, you would know that the bacterium has a ________________ shape. 

Thrombocytes play a big role in 

The superior and inferior vena cava return blood to the ___________________ of the heart.

A cerebrovascular accident is also known as:

The __________________ is the largest lymphatic structure in the human body.  

___________________ arteries carry oxygenated blood to heart muscle.