The conduction velocity of a nerve impulse is slower in myelinated fibers than in unmyelinated fibers because myelin acts as an insulator that slows down the flow of current
Indicate whether the statement is true or false
F
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Which elevate(s) the ribs?
A. Two of the choices are correct. B. Serratus posterior superior C. Transversus thoracis D. External intercostals E. Internal intercostals
A functional syncytium
a. refers to a pair of antagonistic muscles that function together to move a joint in two opposite directions. b. can be excited to contract as a unit because action potentials can be conducted from one cell to adjacent cells through gap junctions. c. refers to the functional junction between a smooth muscle fiber and an autonomic nerve ending. d. more than one of these. e. none of these answers.
What does structure "D" represent on the diagram?
A. tendon B. articular cartilage C. bursa D. fibrous capsule E. synovial membrane
Which of the following major events of prenatal development happens first?
A. Bone calcification begins. B. The central nervous system begins to form. C. The body is covered with downy hair. D. Meconium accumulates in the intestines. E. The eyes open fully.