Which type of blood vessel has valves to prevent backflow of blood?
A. Artery
B. Capillary
C. Vein
D. All blood vessels have valves to prevent backflow of blood.
Answer: C
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The spinal cord begins at the ________ and ends at the ________.
A. foramen magnum; first lumbar vertebrae B. fifth cervical vertebrae; coccyx C. foramen magnum; sacrum D. second cervical vertebrae; first lumbar vertebrae
Twenty-five percent of the cardiac output goes to the kidneys because of their tremendous nutrient requirement for the active transport of Na+
Indicate whether the statement is true or false
All of the following cells are considered "footloose," as they lack cellular junctions, EXCEPT __________.
A)phagocytic cells B)blood cells C)sperm cells D)epithelial cells
In hearing, which structure is vibrated last?
A. The tympanic membrane B. The stapes C. The basilar membrane D. The perilymph inside the scalae