Varicose veins are caused by
A. a loss of elasticity in blood vessels
B. incompetent venous valves
C. the accumulation of fatty substances within blood vessels
Select your answer:
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Living Organisms › ViewHow do the digestive system and the circulatory system work together in the human body?
A. The digestive system sends electric messages, while the circulatory system responds to the messages.
B. The digestive system provides structure for the body, while the circulatory system directs the movement.
C. The digestive system removes liquid toxins from the body, while the circulatory system removes solid waste.
D. The digestive system extracts nutrients from food, while the circulatory system transports those nutrients.
Physiology › View
Which of the following correctly describes the reactive hypermia?
A. None of the answers
B. is the process in which blood flow is increased during changes in neuronal activity in the brain
C. is the process in which blood flow is drastically increased after a blockage (obstruction)
D. is the process in which blood flow is increased during muscle contraction
E. is the process in which blood flow is constant after a blockage (obstruction)