Musculoskeletal system - Bones of the musculoskeletal system

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This musculoskeletal quiz features topics such as:

- Functions of bones
- Structure of long bones
- Bone tissue
- Bone cells
- Bone growth
- Microscopic structure of bones
- Cartilage

1

The following is not a function of bone:
- support the framework of the body and protect delicate structures enclosed by them
- enable movement (for bones anchored by muscles)
- mineral storage for major calcium, phosphorus and other mineral reservoir
- haemopoiesis (red bone marrow - myeloid tissue) forms blood cells
- hormonal production
2

The epiphyses are:
- the extremities of long bones
- spongy (cancellous or porous bone)
- the thin outer layer of dense, compact and lightweight bone
- filled with either yellow or red bone marrow
- all of the above
3

The articular cartilage:
- is a layer of hyaline cartilage that covers articular or joint surfaces of epiphyses
- is a thick, compact, hollow, cylindrical shape which provides strong support without cumbersome weight
- is a tube like hollow in the diaphysis of long bone
- is a membrane that lines the medullary cavity of long bones
4

Which is not true about the bone matrix:
- It is not the dominant extracellular material
- It is more abundant than bone cells
- It contains many collagen fibers
- It is calcified (hard and rigid)
- It can be subdivided into inorganic salts, organic matrix and hormones
5

Osteocytes are:
- Bone forming bone cells that form osteoid for accumulation of mineralised bone
- Bone destroying bone cells
- Inactive mature bone cells
6

80% of bone mass consists of _____, which contains many cylinder-shaped structural units called Osteons or Haversian Systems.
- Compact bone
- Cancellous bone
- Cartilage
7

Fibrous cartilage:
- is a thin layer that covers articular surfaces of bones where it helps cushion jolts
- has the most numerous collagen fibers thus the greatest tensile strength
- contains elastic fibers as well as collagenous fibers so has elasticity and firmness
8

Fibrous joints:
- They have little or no movement within the join. E.g Sutures of skull
- consist of slightly movable joints in the midline of the bone
- most mobile, complex and numerous of joints. e.g joint capsule, synovial membrane, joint cavity, ligaments
9

A muscle or group of muscles that directly performs a specific movement, e.g biceps brachii is known as:
- agonist
- antagonist
- synergist
- fixator muscles
10

Extensibility of muscles refers to:
- the muscles ability to be stimulated
- the muscles ability to contract or shorten
- the muscles ability to extend or stretch
11

Myofibrils consist of:
- bundles of very fine fibres called myofilaments packing close together in sarcoplasm
- fine fibres made up of thick and thin myofilaments producing a cross striae appearance
- several sarcomeres
- all of the above
12

____ is made up mostly of thick filament. Its heads are known as cross bridges and are chemically attracted to actin molecules :
- Myosin
- Actin
- Tropomyosin
- Troponin
13

___ is a globular protein that with tropomyosin and troponin, forms two fibrous strands twisted around each other to form the bulk of the thin filament.
- Myosin
- Actin
- Tropomyosin
- Troponin

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Musculoskeletal system - Bones of the musculoskeletal system

The following is not a function of bone:

The epiphyses are:

The articular cartilage:

Which is not true about the bone matrix:

Osteocytes are:

80% of bone mass consists of _____, which contains many cylinder-shaped structural units called Osteons or Haversian Systems.

Fibrous cartilage:

Fibrous joints:

A muscle or group of muscles that directly performs a specific movement, e.g biceps brachii is known as:

Extensibility of muscles refers to:

Myofibrils consist of:

____ is made up mostly of thick filament. Its heads are known as cross bridges and are chemically attracted to actin molecules :

___ is a globular protein that with tropomyosin and troponin, forms two fibrous strands twisted around each other to form the bulk of the thin filament.

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