The atomic number of an atom equals the number of ______ and the atomic weight
equals the ____.
A) protons; number of protons plus neutrons
B) protons; weight of all the electrons
C) neutrons; number of protons plus electrons
D) neutrons; number of protons
A
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Which of the following is a function of astrocytes?
A. They circulate the cerebrospinal fluid. B. They produce cerebrospinal fluid. C. They phagocytize tissue debris. D. They form myelin in the CNS. E. They help form the blood-brain barrier.
Water moves back and forth across the plasma membrane by the process of ________.
A. osmosis B. active transport C. endocytosis D. facilitated diffusion E. filtration
The artery that transports blood to the left upper limb is the
A. aorta. B. brachiocephalic artery. C. left common carotid artery. D. left subclavian artery. E. left vertebral artery.
Which membrane lines the wall of the thoracic cavity?
A) Visceral B) Parietal C) Mucous D) Cutaneous