The only antibodies that normally cross the placenta are

The portion of the small intestine that attaches to the large intestine is the

In the middle of the thoracic cavity is a region occupied by the heart, great vessels, thymus, esophagus, and trachea called the

Compared to the right ventricle, the left ventricle has all the following characteristics except 

The portion of the small intestine that attaches to the large intestine is the

The outer layer of a tooth is called the

The anterior lobe of the pituitary is also known as the

In active immunization, the

The cells responsible for the production of circulating antibodies are ________ cells.

In active immunization, the