The sites where a chemical substance is transmitted from the presynaptic terminal of an axon to the postsynaptic membrane of a muscle fiber are called
A. neuromuscular junctions.
B. sarcomeres.
C. myofilaments.
D. Z disks.
E. cell body of neuron.
A
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The vessel that receives blood from the head, neck, chest, shoulders, and arms is the
A) internal jugular vein. B) external jugular vein. C) superior vena cava. D) inferior vena cava. E) coronary sinus.
Clotting factor activation turns clotting factors into enzymes
Indicate whether the statement is true or false
Which of the following statements about the spinal cord is NOT correct?
A) It has two enlargements. B) It extends to the level of lumbar vertebra three in an adult. C) It gives rise to 31 pairs of spinal nerves. D) It has a central canal that is continuous with the fourth ventricle of the brain
Which bone has a radial notch?
A) Humerus B) Radius C) Clavicle D) Ulna