Which of the following terms identifies the point of contact between the nerve ending and the muscle fiber?
Insertion site
Origin site
Neuromuscular junction
interneuron
The Correct Answer is C
a: Insertion site - This refers to the attachment point of a muscle tendon to a bone, not the point of contact between nerve and muscle.
b: Origin site - This refers to the attachment point of a muscle tendon to a stationary bone, not the neuromuscular junction.
c. Neuromuscular junction: The neuromuscular junction is the specialized synapse between a motor neuron and a muscle fiber. It is where the nerve impulse is transmitted from the motor neuron to the muscle fiber, resulting in muscle contraction
d: Interneuron - Interneurons are neurons that transmit signals between other neurons; they are not directly involved in the neuromuscular junction.
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Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
a: Cervical: 7, Thoracic: 14, Lumbar: 6 - This count for the thoracic vertebrae is incorrect; there are typically 12 thoracic vertebrae.
b. Cervical: 7, Thoracic: 12, Lumbar: 5-The vertebral column consists of cervical (neck), thoracic (upper back), lumbar (lower back), sacral, and coccygeal regions. The cervical region has 7 vertebrae, the thoracic region has 12, and the lumbar region has 5.
c: Cervical: & Thoracic: 12, Lumbar: 5, Sacral: 3 - This count for the cervical vertebrae is incorrect; there are typically 7 cervical vertebrae.
d: Cervical: & Thoracic: 14, Lumbar: Sacral: 4 - The counts for cervical and lumbar vertebrae are incorrect; there are typically 7 cervical vertebrae and 5 lumbar vertebrae.
Correct Answer is A
Explanation
a. AB positive: Individuals with AB positive blood are universal recipients. They have A and B antigens on their red blood cells but no antibodies (anti-A or anti-B) in their plasma. Therefore, their body will not reject blood types A, B, AB, or Rh positive or negative.
b. A positive: Individuals with A positive blood can only receive A positive or O positive blood. Their plasma contains anti-B antibodies, which would attack blood types B and AB.
c. B negative: Individuals with B negative blood can receive B negative or O negative blood. Their plasma contains anti-A antibodies, which would attack blood types A and AB. The Rh factor is another compatibility consideration, but the question specifies positive.
d. O negative: Individuals with O negative blood are universal donors but not universal recipients. Their red blood cells lack A and B antigens, so they can be donated to anyone. However, their plasma contains anti-A and anti-B antibodies, so they can only receive O negative blood.
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