What is the role of Schwann cells in the repair of nerve fibers?
Transmit electrical impulses
Form myelin sheaths around axons
Generate neurotransmitters
Guide the regeneration of nerve fibers
The Correct Answer is D
A. Transmit electrical impulses: Transmission of electrical impulses along neurons is the function of the neurons themselves, not Schwann cells. Schwann cells support this process but do not directly carry impulses.
B. Form myelin sheaths around axons: Schwann cells do form the myelin sheath in the peripheral nervous system, which insulates axons and speeds up signal conduction. However, in the context of nerve repair, their guiding role is more critical.
C. Generate neurotransmitters: Neurotransmitters are produced by neurons at synaptic terminals to facilitate communication between cells. Schwann cells do not synthesize neurotransmitters.
D. Guide the regeneration of nerve fibers: During nerve injury, Schwann cells play a key role in repair by forming bands of Büngner that guide regrowing axons toward their target tissues. They also secrete growth factors that support axonal regeneration, making them essential for nerve fiber repair.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
A. Lymph vessels: Lymph vessels transport interstitial fluid and do not play a direct role in regulating blood pressure or circulatory resistance during shock.
B. Arterioles: Arterioles are small resistance vessels that regulate blood flow and systemic vascular resistance through constriction or dilation, making them critical in maintaining perfusion during shock.
C. Capillaries: Capillaries are the site of nutrient and gas exchange, but they do not actively control vessel tone or systemic blood pressure.
D. Large veins: Large veins serve as capacitance vessels and blood reservoirs; their tone affects venous return, but arteriolar constriction is more directly responsible for perfusion changes in shock.
Correct Answer is D
Explanation
A. Ribs and sternum: The ribs and sternum form the thoracic cage, which protects vital organs like the heart and lungs, but they are not part of the pectoral girdle.
B. Femur and tibia: The femur and tibia are long bones in the lower limbs. They are part of the leg structure and have no role in connecting the upper limbs to the axial skeleton.
C. Ulna and radius: The ulna and radius are the two bones of the forearm. They form part of the upper limb distal to the pectoral girdle but do not constitute the girdle itself.
D. Clavicle and scapula: The clavicle (collarbone) and scapula (shoulder blade) form the pectoral girdle. They connect the upper limbs to the axial skeleton and provide attachment points for muscles that move the arms.
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