Which of the following membrane potential values must a neuron return to in order to respond to new stimuli:

The dorsal root of a spinal nerve is ______________ and carries ________________ impulses:

Use the following scenario to answer questions 9 & 10: Joey is playing baseball and is up to bat. He swings the bat and hits the ball far into the outfield. As he runs the bases and approaches home base, his heart rate and respiratory rate have been elevated above normal. Which of the following neurons is responsible for stimulating the cardiovascular and respiratory response during this scenario: 

Which of the following neurotransmitters is responsible for affecting emotional states and attention:

Which structure controls the flow of blood into capillary beds?

What is the normal life span of a red blood cell?

A blood clot that breaks loose and travels in the blood flow is called a(n) ______.

Which of the following leukocytes produces antibodies, and as a result, functions in immunity?

Which of the following layers of the heart and their functions are correctly matched?

The biconcave cells in blood that lack nuclei when they are mature are the