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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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
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
In hearing, which structure is vibrated last?
A. The tympanic membrane B. The stapes C. The basilar membrane D. The perilymph inside the scalae