What kind of tissue is the forerunner of long bones in the embryo?
Dense fibrous connective tissue
Hyaline cartilage
Mesenchymal tissue
Elastic cartilage
The Correct Answer is B
Choice A reason: Dense fibrous connective tissue forms tendons and ligaments, not the precursor to long bones. It lacks the structural and biochemical properties necessary for endochondral ossification.
Choice B reason: Hyaline cartilage serves as the template for long bone formation during embryonic development. Through endochondral ossification, this cartilage is gradually replaced by bone tissue, making it the correct answer.
Choice C reason: Mesenchymal tissue is the embryonic connective tissue from which various structures, including cartilage and bone, originate. However, it is not the immediate precursor to long bones; it first differentiates into chondrocytes that form hyaline cartilage.
Choice D reason: Elastic cartilage is found in structures like the ear and epiglottis. It is not involved in the formation of long bones and lacks the rigidity and mineralization capacity required for ossification.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
Choice A reason: The talus is a tarsal bone in the ankle that articulates with the tibia and fibula. It is not embedded within a tendon and therefore not classified as a sesamoid bone.
Choice B reason: The radius is one of the two long bones in the forearm. It is not a sesamoid bone, as it is not formed within a tendon.
Choice C reason: The femur is the longest and strongest bone in the body, located in the thigh. It is a long bone, not a sesamoid bone.
Choice D reason: The hamate is a carpal bone in the wrist. It is not embedded in a tendon and thus not a sesamoid bone.
Choice E reason: The patella, or kneecap, is the most well-known example of a sesamoid bone. It is embedded within the quadriceps tendon and functions to protect the knee joint and improve leverage during leg extension.
Correct Answer is B
Explanation
Choice A reason: Synarthrotic joints are immovable, not slightly movable. Examples include sutures in the skull. They are designed for stability rather than movement.
Choice B reason: Synovial joints are the only type of joint that is always freely movable. They include hinge joints (e.g., elbow), ball-and-socket joints (e.g., shoulder), and others that allow a wide range of motion due to the presence of a synovial cavity and lubricating fluid.
Choice C reason: A gomphosis is a type of fibrous joint found between teeth and their sockets. It is immovable and not freely movable.
Choice D reason: Cartilaginous joints do not have a joint cavity. They are connected entirely by cartilage and allow limited movement, such as the intervertebral discs and the pubic symphysis.
Choice E reason: Immovable joints are called synarthroses, not amphiarthroses. Amphiarthroses are slightly movable joints, such as those between vertebrae.
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