a&p test 2 questions Flashcards
A fibrous joint that is a peg-in-socket is called a
gomphosis joint
In the classification of joints, which of the following is true?
All synovial joints are freely movable.
Bending of the tip of the finger exhibits flexion.
True
Which of the following is an abnormal lateral curvature of the vertebral column often seen in the thoracic region?
scoliosis
Which structure allows the diaphysis of the bone to increase in length until early childhood?
epiphyseal plate
Connective tissue sacs lined with synovial membranes that act as cushions in places where friction develops are called
Bursae
What structure in skeletal muscle cells functions in calcium storage?
sarcoplasmic reticulum
Myoglobin
stores oxygen in muscle cells
The frontal bone articulates with the parietal bone by means of the sagittal suture.
False
Which of the following are cartilaginous joints?
Synchondroses
The canal that runs through the core of each osteon (the Haversian canal) is the site of
blood vessels and nerve fibers
Which of the following is the abnormal curve often seen in pregnant women as they attempt to preserve their center of gravity toward the end of the pregnancy?
Lordosis
What produces the striations of a skeletal muscle cell?
the arrangement of myofilaments
A motor neuron and all the muscle cells that it stimulates are referred to as a motor end plate.
False
The cell responsible for secreting the matrix of bone is the
Osteoblasts
In an isotonic contraction, the muscle
changes in length and moves the “load”
The contractile units of skeletal muscles are
myofibrils
Cranial bones develop
within fibrous membranes
Which of the following is not a movement that can occur between vertebrae?
Supination
What is moving a limb away from the median plane of the body along the frontal plane called?
Abduction
Each consecutive bone lamella has collagen fibers that wrap in alternating directions.
True
Bones are classified by whether they are weight bearing or protective in function.
False
What is the functional unit of a skeletal muscle called?
Sarcomere
Articular cartilage found at the ends of the long bones serves to
provide a smooth surface at the ends of synovial joints
Muscle tone is the small amount of tautness or tension in the muscle due to weak, involuntary contractions of its motor units.
True
Articulations permitting only slight degrees of movement are
amphiarthroses
Although all skeletal muscles have different shapes, the fascicle arrangement of each muscle is exactly the same.
False
In symphysis joints the articular surfaces of the bones are covered with
hyaline cartilage
Muscle tone is the small amount of tautness or tension in the muscle due to weak, involuntary contractions of its motor units.
True
What structure in skeletal muscle cells functions in calcium storage?
sarcoplasmic reticulum
The structural unit of spongy is called
trabeculae
A contraction in which the muscle does not shorten but its tension increases is called isometric contraction.
True
When a muscle fiber contracts, the I bands diminish in size, the H zones disappear, and the A bands do not diminish in length
True
Synarthrotic joints
permit essentially no movement
Which of the following is not a connective tissue sheath that wraps individual muscle fibers?
aponeurosis
The oxygen-binding protein found in muscle cells is
myoglobin
The suture that connects the two parietal bones together is the
sagittal
During muscle contraction, myosin cross bridges attach to which active sites?
actin filaments
Which of the following bone tissues is adapted to support weight and withstand tension stress?
Compact Bone
The structural unit of compact bone (osteon) resembles the growth rings of a tree trunk
True
Which of these is not a way of classifying muscles?
the type of muscle fibers
What kind of tissue is the forerunner of long bones in the embryo?
hyaline cartilage
The process of bones increasing in width is known as
appositional growth
What is the role of calcium ions in muscle contraction?
bind to regulatory sites on troponin to remove contraction inhibition
An osteon contains osteocytes, lamellae, and a central canal, and is found in compact bone only.
True
A fracture in the shaft of a bone would be a break in the
diaphysis
Which of the following surrounds the individual muscle cell?
endomysium
Muscles are only able to pull, they never push
True
Bones are constantly undergoing resorption for various reasons. Which of the following cells accomplishes this process?
osteoclast
The term aponeurosis refers to
a sheetlike indirect attachment to a skeletal element
The reason that intervertebral discs exhibit a large amount of tensile strength, which allows them to absorb shock, is because they possess
collagen fibers
What is the functional role of the T tubules?
enhance cellular communication during muscle contraction
