What is a joint?
A place where two or more bones meet.
A type of blood cell.
A type of muscle tissue
A part of the skeletal system.
The Correct Answer is A
Rationale:
A. A joint (also called an articulation) is the location where bones come together. Joints allow varying degrees of movement, depending on their type: synarthroses (immovable), amphiarthroses (slightly movable), and diarthroses (freely movable, also called synovial joints).
B. Blood cells (red blood cells, white blood cells, platelets) are components of blood, not related to joints.
C. Muscle tissue is contractile tissue that enables movement, but it is not the definition of a joint.
D. While technically true that joints are part of the skeletal system, this answer is too vague and does not fully define what a joint actually is.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
Rationale:
A. Smooth muscle (found in organs and vessels) and cardiac muscle (in the heart) function involuntarily under the autonomic nervous system. Skeletal muscle, on the other hand, is under voluntary control through the somatic nervous system.
B. This would be incorrect because skeletal muscle is not involuntary, and smooth/cardiac muscles are not voluntary.
Correct Answer is C
Explanation
Rationale:
A. Hinge joints, like the elbow and knee, allow movement in only one plane (flexion and extension) and therefore have a limited range of motion.
B. Condyloid joints, such as the wrist, permit movement in two planes (flexion/extension and abduction/adduction) but do not allow full rotation.
C. Ball-and-socket joints, including the shoulder and hip, consist of a spherical head fitting into a cup-like cavity, allowing movement in multiple planes—flexion, extension, abduction, adduction, rotation, and circumduction—providing the greatest range of motion of all joint types.
D. Saddle joints, like the thumb carpometacarpal joint, allow movement in two planes with some rotation but still offer less overall mobility than ball-and-socket joints.
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