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Which muscle is the main muscle for inspiration?

All of the following major vessels contribute to blood flowing into the cranial vena cava except the:

The wave on an electrocardiogram that is associated with the atrial wall depolarization is the:

Systole is:

Blood enters the heart from the pulmonary veins in the:

Starting from the outside, what is the correct sequence of the ear bones in the middle ear?

Which bone in the appendicular skeleton has a ridge called a crest?

Which two valves comprise the atrioventricular valves?

In which species will you find an os penis?

Which vertebra has no vertebral body, but is made up of only a bony ring with two transverse processes sticking out laterally?