The structural unit of compact bone is called the

Another term for nostrils is

Which of the following is a symptom?

The bonds formed when electrons are shared are called

B lymphocytes that have been exposed to an antigen develop into cells that produce antibodies called _____ cells.

Which group of people has the highest percentage of body water?

The rings of calcified matrix that make up the haversian system are called

The triceps brachii and the biceps brachii

Lifting a book off the desk is an example of what type of contraction?

Which blood vessel muscle layer is usually thicker in the arteries than in veins?