What movement decreases the angle between bones at a joint, often bending a limb?
Flexion
extension
adduction
abduction
The Correct Answer is A
Rationale:
A. Flexion is a movement that decreases the angle between two bones at a joint. It often involves bending a limb, such as bending the elbow or knee, or moving the chin toward the chest at the neck. Flexion brings body parts closer together and is a fundamental movement in many joints.
B. The opposite of flexion, extension increases the angle between two bones, straightening a joint. For example, straightening the elbow after it has been bent is extension.
C. This is the movement of a body part toward the midline of the body, such as bringing the arm down to the side from a raised position. It does not specifically decrease the angle at a joint.
D. This is the movement of a body part away from the midline, such as lifting the arm or leg out to the side. Like adduction, it is not about decreasing the angle at a joint.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
Rationale:
A. Amphiarthroses are slightly movable joints where bones are connected by cartilage. Examples include the intervertebral discs (between vertebrae) and the pubic symphysis. These joints allow limited movement while providing strength and stability.
B. These are freely movable joints, also known as synovial joints (such as the knee, elbow, and shoulder). They are not primarily joined by cartilage but by a synovial cavity and ligaments.
C. These are immovable joints where bones are connected by fibrous tissue, such as the sutures of the skull. They do not involve cartilage.
D. A type of diarthrosis characterized by a synovial cavity filled with fluid, articular cartilage, and supporting ligaments, allowing free movement. They are not defined solely by cartilage connections.
Correct Answer is B
Explanation
Rationale:
A. Rectus femoris is one of the quadriceps muscles located in the anterior thigh, important for knee extension and hip flexion.
B. Deltoid is the large, triangular-shaped muscle covering the shoulder joint, responsible for abduction, flexion, extension, and rotation of the arm. This matches the pictured muscle.
C. Diaphragm is the dome-shaped muscle that separates the thoracic and abdominal cavities, playing a primary role in respiration.
D. Dorsogluteal refers to a site in the gluteal region (buttocks) commonly used for intramuscular injections, not a specific muscle.
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