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

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

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?  

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

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

The source of Aldosterone is the kidney.