Which of the following labeled structures in the diagram are concentric lamellae?
a) A
b) B
c) C
d) D
e) G
c
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A joint in which there is a complete fusion of two separate bones into one bone is called a
a) synchondrosis. b) syndesmosis. c) symphysis. d) diarthrosis. e) synostosis.
Which lymphatic organ is poorly developed at birth and develops postnatally when invaded by immunocompetent lymphocytes?
A. Bone marrow B. Lymph node C. Tonsil D. Thymus E. Spleen
Saltatory conduction of an action potential means that
A. once one action potential is created, it moves down the axon. B. the whole axon depolarizes at the same time. C. one action potential stimulates the production of a new action potential at the adjacent site. D. an action potential is conducted from one node of Ranvier to the next node.
The brain and spinal cord are covered by the __________, composed of three membrane layers.
Fill in the blank(s) with the appropriate word(s).