Musculoskeletal Flashcards
The musculoskeletal system consists of the body’s bones, joints, and muscles
A)true
B)false
.A
1) for support to stand erect and
(2) for movement. The musculoskeletal system also functions
(3) to encase and pro/ec/thc inner vital organs (e.g., brain, spinal cord, heart), (
4) to prorluce the red blood cells in the bone marrow (hematopoiesis), and
(5) as a reservoir for storage of essential minerals, such as calcium and phosphorus in the bones.
Musculoskeletal system
. It has 206 bones, which support the body like the posts and beams of a building.
A)true
B)false
.A
Bone and cartilage are specialized forms of connective tissue. Bone is hard, rigid, and very dense. Its cells are continually turning over and remodeling.
The joint (or articulation) is the place of union of two or more bones. Joints are the functional units of the musculoskeletal system because they permit the mobility needed for activities of daily living
.
In nonsynovial joints, the bones are united by fibrous tissue or cartilage and are immovable (e.g., the sutures in the skull) or only slightly movable (e.g., the vertebrae).
Synovial joints are freely movable because they have bones that are separated from each other and are enclosed in a joint cavity
.
Just like grease on gears, synovial fluid allows sliding of opposing surfaces, and this sliding permits movement.
.
is avascular; it receives nourishment from synovial fluid that circulates during joint movement. It is a very stable connective tissue with a slow cell turnover. It has a tough, firm consistency, yet is flexible. This cartilage cushions the bones and gives a smooth surface to facilitate movement.
A)cartilage
B)joint
C)muscles
Cartilage
The joint is surrounded by a fibrous capsule and is supported by ligaments.
.
are fibrous bands running directly from one bone to another that strengthen the joint and help prevent movement in undesirable directions
A)ligament
B)joint
C)both a and b
Ligament
is an enclosed sac filled with viscous synovial fluid, much like a joint. Are located in areas of potential friction and help muscles and tendons glide smoothly over bone.
A)bursa
B)ligament
C)muscles
Bursa
Muscles account for 40% to 50% of the body’s weight.
A)true
B)false
.true
When they contract, they produce movement
A)muscles
B)joints
C)both a and b
Muscles
Muscles are of three types: skeletal, smooth, and cardiac
A)true
B)false
.true
Each skeletal muscle is composed of bundles of muscle fibers, or fasciculi.
The skeletal muscle is attached to bone by a tendon-a strong fibrous cord.
A)true
B)false
.
The temporomandibular joint (TMJ) is the articulation of the mandible and the temporal bone
A)true
B)false, the joint articulates with the mandible and sphenoid bone
.true
You can feel it in the depression anterior to the tragus of the ear.
A)temporalmandibular joint
B)mandible joint
Temporalmandibular joint
The TMJ permits jaw function for speaking and chewing
A)temporalmandibular joint
B)mandible
Temporalmandibular. Joint
The joint allows three motions: (l) hinge action to open and close the jaws; (2) gliding action for protrusion and retraction; and (3) gliding for side-to-side movement of the lower jaw
A)temporalmandibular joint
B)mandible
Temporalmandibular joint
The vertebrae are 33 connecting bones stacked in a vertical column
A)true
B)false
Ture
Humans have 7 cervical, 12 thoracic, 5 lumbar, 5 sacral, and 3 or 4 coccygeal vertebrae.
A)true
B)false
True
SPINE
.
The spinous processes of C7 and Tl are prominent at the base of the neck.
A)true
B)false
.true
The inferior angle of the scapula normally is at the level of the interspace between T7 and T8
A)true
B)false
.true
An imaginary line connecting the highest point on each iliac crest crosses L4.
A)true
B)false
.true