Which type of cell is responsible for breaking down bone tissue?
Osteoclast.
Chondrocytes.
Osteocytes.
Osteoblast.
The Correct Answer is A
Osteoclasts are the type of cells that break down bone tissue by secreting acid and enzymes.
They are derived from monocytes and macrophages, two types of white blood cells.
Choice B is incorrect because chondrocytes are the cells that produce and maintain cartilage, a flexible connective tissue found in joints.
Choice C is incorrect because osteocytes are the mature bone cells that maintain the mineral concentration of the bone matrix.
They are derived from osteoblasts, the bone-forming cells.
Choice D is incorrect because osteoblasts are the cells that form new bone by synthesizing and secreting collagen and calcium salts.
They are derived from osteogenic cells, the undifferentiated cells that can divide.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
The thumb has three joints: the carpometacarpal (CMC) joint, the metacarpophalangeal (MP) joint, and the interphalangeal (IP) joint.
The CMC joint is a saddle type of joint that allows the thumb to move in multiple directions. A saddle joint has two concave surfaces that fit together like a rider on a horse.
Choice A is incorrect because hinge joints allow only flexion and extension movements, such as the IP joints of the thumb.
Choice B is incorrect because condylar joints have an oval-shaped surface that articulates with a shallow cavity, such as the MP joint of the thumb.
Choice D is incorrect because ball and socket joints have a spherical head that fits into a cup-like socket, such as the shoulder or hip joints.
Correct Answer is C
Explanation
Dorsiflexion is the movement of the foot upwards towards the shin.
It involves the contraction of the muscles in the anterior part of the leg, such as the tibialis anterior.
Dorsiflexion is used when walking or running.
Choice A is incorrect because eversion is the movement of the foot outwards, away from the midline of the body.
Choice B is incorrect because plantarflexion is the movement of the foot downwards, away from the shin.
Choice D is incorrect because inversion is the movement of the foot inwards, towards the midline of the body.
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