The atomic number of an atom is determined by the
A) number of protons.
B) number of neutrons.
C) number and arrangement of electrons.
D) size of the atom.
E) mass of the atom.
A) number of protons.
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Which of the following is true of spongy bone?
A. Lamellae are arranged in concentric circles in osteons. B. Nourishment is supplied through a central canal. C. Bone is arranged in plates called trabeculae. D. Arrangement of the bony plates is completely random. E. The spaces are filled with yellow marrow.
The blood supply to the skin arises from a network of blood vessels called the ________ plexus in the hypodermis, at its border with the reticular layer of the dermis.
A) cervical B) mesenteric C) brachial D) celiac E) cutaneous
Mucosa-associated lymphoid tissues include all of the following EXCEPT ________
A) palatine tonsils B) islets of Langerhans C) lingual tonsils D) Peyer's patches
The pulmonary circuit
A) sends oxygen-poor blood to the heart. B) sends oxygen-poor blood to the tissues. C) brings oxygen-rich blood from the tissues. D) sends oxygen-poor blood to the lungs.