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A drug that decreased calcium levels in a muscle cell and thereby lowered the number of crossbridges formed during the heart’s contractions would be a

Which type of leukocyte releases histamine?

The anatomic features of the respiratory membrane that make alveolar gas exchange so efficient are

The viscosity of blood is ________ proportional to the number of erythrocytes and _______ proportional to the amount of fluid.

Macrophages are the converted monocytes that phagocytize bacteria, cell fragments, dead cells, and debris.

Breathing muscles such as the diaphragm are controlled by neurons of the _________ nervous system.

   In this sagittal section showing the upper respiratory tract, what structure does number 5 indicate?

Compared to most interstitial fluid in the body, the interstitial fluid of an inflamed area would have a lower osmolarity and a lower concentration of proteins.

Which class of chemical messenger facilitates white blood cell formation in bone marrow?

Upon activation, a T-lymphocyte