Which of the following would have the lowest blood pressure?  

Parathyroid hormone is released when blood calcium levels decrease. This is an example of control by __________ stimuli.

If a person is anemic, they would have a _________ viscosity and ___________ resistance to flow.

Leukocytes are mainly differentiated by: 

This hormone acts on angiotensinogen to convert it to Ang I:

Granulocytes called basophils are phagocytic and the most numerous of all leukocytes.  

The “pacemaker” of the heart is the

Which of the following is a semilunar valve?  

Parathyroid hormone is released when blood calcium levels decrease. This is an example of control by __________ stimuli.

The aortic semilunar valve opens when pressure in the left ventricle exceeds the aortic pressure.