1What are the six major functions of the skeletal system?
Support, protection, movement, mineral storage, blood cell production, and fat storage.
2What are the two divisions of the skeleton?
Axial skeleton and appendicular skeleton.
3What makes up the axial skeleton?
The skull, vertebral column, ribs, sternum, and associated bones.
4What makes up the appendicular skeleton?
The limbs and the pectoral and pelvic girdles.
5What does the axial skeleton primarily do?
Supports and protects the body's central organs and structures.
6What does the appendicular skeleton primarily do?
Allows movement and locomotion.
7What bone is the upper arm bone?
Humerus.
8What bones are in the forearm?
Radius and ulna.
9Which forearm bone is on the thumb side?
Radius.
10Which forearm bone is on the little-finger side?
Ulna.
11What is the thigh bone?
Femur.
12What are the lower leg bones?
Tibia and fibula.
13Which lower leg bone is larger and medial?
Tibia.
14What is the kneecap called?
Patella.
15What are the wrist bones called?
Carpals.
16What are the ankle bones called?
Tarsals.
17What are the palm bones called?
Metacarpals.
18What are the foot bones between the tarsals and phalanges?
Metatarsals.
19What are the finger and toe bones called?
Phalanges.
20What is the collarbone called?
Clavicle.
21What is the shoulder blade called?
Scapula.
22What is the breastbone called?
Sternum.
23What are the ribs?
Bones that help form and protect the thoracic cage.
24What is the vertebral column?
The backbone that supports the body and protects the spinal cord.
25What are long bones?
Bones longer than they are wide, such as the femur and humerus.
26What are short bones?
Cube-shaped bones such as carpals and tarsals.
27What are flat bones?
Thin, flattened bones such as the sternum, ribs, and scapulae.
28What are irregular bones?
Bones with complex shapes, such as vertebrae.
29What is compact bone?
Dense bone tissue that provides strength and forms much of the outer bone.
30What is spongy bone?
Porous bone containing trabeculae that helps reduce weight and distribute forces.
31What is the diaphysis?
The shaft of a long bone.
32What is an epiphysis?
An expanded end of a long bone.
33What is the metaphysis?
The region between the diaphysis and epiphysis.
34What is the medullary cavity?
The hollow cavity inside the shaft of a long bone containing marrow.
35What is the periosteum?
A connective tissue membrane covering the external bone surface.
36What is the endosteum?
A membrane lining internal bone surfaces.
37What is articular cartilage?
Hyaline cartilage covering joint surfaces to reduce friction and absorb shock.
38What is the epiphyseal plate?
A cartilage plate where a growing long bone increases in length.
39What is the epiphyseal line?
The bony remnant of the epiphyseal plate after growth stops.
40What is red bone marrow?
Marrow that produces blood cells.
41What is yellow bone marrow?
Fat-storing marrow found mainly in adult long bones.
42What is hematopoiesis?
The production of blood cells.
43What do osteoblasts do?
Build new bone tissue.
44What do osteocytes do?
Maintain mature bone tissue and monitor its condition.
45What do osteoclasts do?
Break down and resorb bone tissue.
46What is osteoporosis?
A condition involving decreased bone mass and increased fracture risk.
47What is hyaline cartilage?
A smooth, resilient cartilage found at articular surfaces and other locations.
48What is fibrocartilage?
Strong cartilage that resists compression and is found in structures such as intervertebral discs.
49What is a closed fracture?
A fracture in which the skin remains intact.
50What is an open fracture?
A fracture in which the broken bone communicates with the outside through a wound.
51What is a transverse fracture?
A fracture that runs across the bone.
52What is an oblique fracture?
A fracture that runs diagonally across the bone.
53What is a spiral fracture?
A fracture caused by twisting that produces a spiral pattern.
54What is a comminuted fracture?
A fracture in which the bone breaks into multiple fragments.
55What is a greenstick fracture?
An incomplete fracture common in children in which the bone bends and partially breaks.
56What is an impacted fracture?
A fracture in which broken bone ends are driven into each other.
57What happens first during fracture repair?
A hematoma forms at the fracture site.
58What is a soft callus?
A fibrocartilaginous bridge that temporarily connects broken bone ends.
59What is a hard callus?
New bone that replaces the soft callus.
60What is bone remodeling?
The reshaping and strengthening of repaired bone.
61Why is calcium important?
It supports bone structure, muscle contraction, nerve function, and blood clotting.
62What hormone raises blood calcium levels?
Parathyroid hormone, or PTH.
63Where are the parathyroid glands located?
On the posterior surface of the thyroid gland.
64How does PTH increase blood calcium?
It promotes bone resorption, kidney calcium retention, and vitamin D activation.
65What hormone can lower blood calcium?
Calcitonin.
66What does vitamin D do for calcium balance?
It increases intestinal absorption of calcium and phosphorus.
67What is a joint?
The location where two or more bones meet.
68What is a synovial joint?
A freely movable joint containing a joint cavity and synovial fluid.
69What is synovial fluid?
Fluid that lubricates joints and helps nourish articular cartilage.
70What does a ligament connect?
Bone to bone.
71What does a tendon connect?
Muscle to bone.
72What is flexion?
A movement that decreases the angle between bones.
73What is extension?
A movement that increases the angle between bones.
74What is hyperextension?
Extension beyond the anatomical position or normal range.
75What is abduction?
Movement away from the body's midline.
76What is adduction?
Movement toward the body's midline.
77What is rotation?
Movement in which a bone turns around its longitudinal axis.
78What is pronation?
Rotation of the forearm so the palm faces posteriorly in anatomical position.
79What is supination?
Rotation of the forearm so the palm faces anteriorly in anatomical position.
80What is dorsiflexion?
Moving the top of the foot toward the shin.
81What is plantar flexion?
Pointing the foot downward, as when standing on tiptoe.