Examlex
By examining fossil evidence, paleontologists believe that mammals evolved from ancestors of modern:
Thoracic Duct
The largest lymphatic vessel in the body, which drains lymph from the lower and left side of the body into the venous system.
Cisterna Chyli
A dilated sac at the lower end of the thoracic duct into which lymph from the lower limbs and abdomen drains.
Cardiovascular System
The organ system that circulates blood through the body, consisting of the heart, blood, and blood vessels.
Palatine Tonsils
A pair of soft tissue masses located at the rear of the throat, part of the immune system.
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