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The ___________________  serve(s) the heart muscle itself by bringing oxygen-rich blood and nutrients to heart cells.

 Which statement is NOT true of the B cells? 

 The portion of the kidney which is continuous with the ureter is the 

_______________ is defined as the dynamic constancy of the internal environment.

Simple, squamous epithelial tissue would contain:

 The tube that transports urine from the kidney to the urinary bladder is the 

The respiratory center of the brain is sensitive to

Vessels called _____________ play an important role in homeostasis because an exchange of subtances takes place across their thin walls.

_____________enter body cells by attaching to cell receptors.

The entrance and exit of air into and out of the lungs is called _______________.