ATI RN
Muscular System Multiple Choice Questions Questions
Question 1 of 5
The lumbar region is
Correct Answer: D
Rationale: The lumbar region (lower back) is superior to the popliteal region (behind the knee), per anatomical regions lumbar above, popliteal lower on the leg. It's superior to gluteal , superior to umbilical , inferior to cervical . Superiority to popliteal, per body mapping, makes 'd' correct.
Question 2 of 5
Which statement is correct about the origin of a muscle?
Correct Answer: B
Rationale: A muscle's origin is its fixed attachment, typically the less movable bone, often more proximal (closer to the body's midline) in limb muscles. For example, the biceps brachii originates at the scapula (immovable relative to the arm) and inserts on the radius (movable). This anchors contraction, pulling the insertion toward the origin. 'Immovable' is relative bones shift slightly but the origin resists movement more, leveraging skeletal stability. Proximal positioning aligns with anatomical convention in limbs, though exceptions (e.g., abdominal muscles) exist. Aponeuroses, flat tendon sheets, may connect origins (e.g., rectus abdominis), but aren't universal. Movable origins contradict biomechanical principles: muscles shorten toward a stable point. Less proximal origins occur in rare cases, but the standard confirmed by dissection and kinesiology prioritizes the immovable, proximal end. This framework governs force direction, distinguishing origin from insertion in movement analysis.
Question 3 of 5
The nurse encourages the patient to use the four-point crutch gait technique. This technique is most likely indicated because it:
Correct Answer: B
Rationale: The four-point crutch gait involves alternating crutch and leg movements (right crutch, left leg, left crutch, right leg), providing maximum stability due to three points of support on the ground at all times. This is ideal for patients needing balance and safety, such as those with weakness or partial weight-bearing restrictions. Non-weight bearing typically uses a swing-through gait, not four-point. Mimicking normal walking is closer to a two-point gait, which is less stable. Rapid pace aligns with swing gaits, not the deliberate four-point method. Stability is the key advantage here, making it suitable for patients recovering from lower limb injuries or neurological conditions, ensuring safe mobility over speed or normalcy.
Question 4 of 5
A patient is learning to use crutches on the stairs. When evaluating this patient, which action indicates that the patient needs further instruction?
Correct Answer: B
Rationale: When ascending stairs with crutches, the correct technique is to lead with the good leg, using it to bear weight and lift the body, followed by the crutches and affected leg together. Placing the affected leg first risks instability and injury, as it can't support the climb reliably, indicating a need for reteaching. Leading with the good leg is proper, as is placing crutches on the next step with the affected leg in some methods. The swing-through method applies more to flat surfaces, not stairs, but isn't the focus here. The error in leading with the affected leg shows misunderstanding of weight-bearing sequence, critical for safety and efficiency on stairs.
Question 5 of 5
The nurse explains that carpal tunnel syndrome is caused when the carpal tunnel compresses the:
Correct Answer: C
Rationale: Carpal tunnel syndrome results from compression within the wrist's carpal tunnel, a narrow passage housing tendons and the median nerve. This nerve, when squeezed by swelling or repetitive strain, causes numbness, tingling, and pain in the thumb and fingers. The radial artery supplies the hand but isn't in the tunnel. The brachial artery is in the upper arm, unrelated to wrist issues. The ulnar nerve runs outside the tunnel, affecting different fingers when compressed. The median nerve's location and symptoms align with the condition's hallmark, making it the clear cause, distinct from vascular or other nerve involvement.