When a virus invades a host the most common threat is
a. stimulation of muscle tone in the heart.
b. destruction of cells by viral reproduction.
c. production of viral fluids in the bloodstream.
d. fermentation of acids in the digestive system.

High blood pressure occurs when there is too much blood flowing through the blood vessels at one time. by changing the amount of water in the blood, blood pressure can change. the excretory system can to lower blood pressure.which would most likely occur in the kidney? a)more water would be transferred from the nephron.b)less water would be absorbed into the nephron.c)the amount of water in the bladder would decrease.d)the amount of water in the blood would increase.