Select your answer:
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The Blood › ViewWhich blood vessel has valves to prevent the back-flow of blood?
A. Veins
B. Arteries
C. Capillaries
Musculoskeletal System › View
These muscles are considered involuntary, they cannot be controlled consciously. They are present in the walls of the esophagus, stomach, small and large intestines.
A. smooth muscles
B. cardiac muscles
C. skeletal muscles