The figure illustrates a detailed drawing of the neuromuscular junction. What does "C" represent?
A. Sarcolemma
B. Presynaptic terminal
C. Synaptic vesicles
D. Synaptic cleft
E. Postsynaptic membrane
Answer: C
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A motor unit refers to
a. a single motor neuron plus all of the muscle fibers it innervates. b. a single muscle fiber plus all of the motor neurons that innervate it. c. all of the motor neurons supplying a single muscle. d. a pair of antagonistic muscles. e. a sheet of smooth muscle cells connected by gap junctions.
Where does hemopoiesis occur?
A. Yellow bone marrow B. Endosteum C. Red bone marrow D. Epiphyseal line E. Nutrient foramina
The second thoracic spinal nerve exits the spinal column through the
A. vertebral canal of vertebrae T1, T2, and T3. B. intervertebral foramen between vertebrae T1 and T2. C. sacral hiatus. D. intervertebral foramen between vertebrae T2 and T3.
The ________ is an important ridge of muscle extending horizontally around the right ventricle from the interventricular septum to the base of the anterior papillary muscle containing part of the conducting system
A) auricle B) pectinate muscle C) trabeculae carneae D) moderator band E) conus arteriosus