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what is the equation for mean arterial pressure

what is anemia 

which of the following describes downregulation

which of the following begins the cardiac conduction cycle

A channel opens in a neuronal membrane. What two forces determine whether an ion will pass through it (i.e., cause an ion to move into or out of the cell)? Please answer in 5 words or less.

Activator proteins can bind to CpG islands and prevent DNA methyl transferase access to DNA. Thus, in the presence of activator proteins, CpG islands are generally [methylated] and this [closes] chromatin and leads to [notranscription] of nearby genes. 

Which of the following is true for lipid soluble (steroid) hormones

Which of the following is not required for an NMDA receptor to open?

Which heart chamber generates the force for pulmonary circulation

what is an embolism