What causes the first heart sound?

The Sympathetic Nervous System is our “Rest and Digest” system, increasing heart rate and the rate of digestion.

Which of the following statements is FALSE regarding Growth Hormone:

In capillary exchange, this forces pushes water and small molecules from the capillary to the surrounding tissues:

Which of the following statements is FALSE regarding capillaries:

This hormone from the anterior lobe of the pituitary gland causes the development of ova and sperm:

Jeremy’s grandfather has a weakened heart and is being treated with blood thinners.  What is the effect of a blood thinner:

Which of the following statements if FALSE regarding heart valves:

Identify the factor that does NOT result in an increase in blood pressure:

Which of the following has the greatest effect on the return of blood to the heart: