Select your answer:
Topics:
Psychology Teeth and Microbes Bacteria & Viruses Breath Benefits of Physical Activity Deaf Blind Infection Control Molecular Genetics Cardiovascular Diseases Pathophysiology_Endocrine Circulatory & Respiratory Basic Structure of the Human Body Excretion-Dialysis Tutor Oral Biology Hospital UnitOther quiz:
Vessels › View 
Which layer of the typical vessel can be regulated to constrict or dilate the lumen?
A. vasa vasorum
B. tunica media
C. tunica externa
D. tunica intima
Nervous System Functioning › View
The two major divisions of the central nervous system are the _____ and the two major divisions of the peripheral nervous are the _____.
A. somatic and autonomic systems; brain and spinal cord
B. brain and peripheral system; somatic and sympathetic systems
C. somatic system and spinal cord
D. brain and spinal cord; autonomic and somatic systems