Connective tissue sacs lined with synovial membrane that act as cushions in places where friction develops are called:
Tendons
Bursae
Menisci
Joint cavities
Ligaments
The Correct Answer is D
Choice A reason: Tendons connect muscles to bones and transmit force during contraction. They do not act as cushions or reduce friction.
Choice B reason: Bursae are the correct answer. These are small fluid-filled sacs lined with synovial membrane that reduce friction between moving structures such as tendons and bones or skin and bones. They are commonly found near joints like the shoulder, elbow, and knee.
Choice C reason: Menisci are fibrocartilaginous pads found in certain joints like the knee. They help distribute weight and improve joint stability but are not fluid-filled sacs.
Choice D reason: Joint cavities are spaces within synovial joints that contain synovial fluid. While they allow movement, they are not separate cushioning structures like bursae.
Choice E reason: Ligaments connect bones to other bones and stabilize joints. They do not serve as cushions or reduce friction.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
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.
Correct Answer is B
Explanation
Choice A reason: Inversion refers to turning the sole of the foot inward, toward the midline. It is a side-to-side movement at the ankle and does not elevate the heel or involve tiptoe posture.
Choice B reason: Plantar flexion is the correct answer. It involves pointing the toes downward and lifting the heel off the ground, which is exactly the motion used when standing on tiptoes. This movement occurs at the ankle joint and is essential for actions like walking, jumping, and reaching upward.
Choice C reason: Eversion is the opposite of inversion and involves turning the sole of the foot outward. Like inversion, it is a lateral movement and unrelated to tiptoe posture.
Choice D reason: Dorsiflexion is the opposite of plantar flexion. It involves lifting the toes upward toward the shin, such as when walking on heels. It does not help in reaching upward.
Choice E reason: Supination refers to rotating the forearm so the palm faces upward or forward. It is unrelated to foot movement or standing on tiptoes.
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