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WorksheetsThe Skeletal System Introduction
Total questions: 40
Worksheet time: 20mins
According to the text, what are the skeletal system’s primary responsibilities?
Generating nerve impulses and regulating hormones
Supporting the body and protecting vital organs
Digesting nutrients and eliminating wastes
Maintaining body temperature and producing enzymes
Which statement accurately reflects human bone counts at different life stages?
Humans are born with about 206 bones and gain more with age.
Humans are born with more than 270 bones that fuse to about 206 in adulthood.
Humans always have exactly 230 bones throughout life.
Humans start with fewer than 150 bones and reach 206 by adulthood.
Which phrase best explains the term 'framework' as used in the skeletal system functions list?
A network that transports oxygen through the bloodstream
A structure that supports and gives shape to the body
A set of muscles that contract to create motion
A layer of skin that prevents dehydration
Match each skeletal system function to its description.
Protects internal organs
Shields vital structures like the heart and lungs
Produces blood cells
Forms components of blood in marrow
Stores calcium, phosphorus, and fats
Keeps important minerals and lipids in reserve
Which statement about bone numbers over time is most accurate?
Bone count increases from birth to adulthood due to growth of new bones.
Bone count decreases from birth to adulthood because some bones fuse together.
Bone count remains unchanged from birth to adulthood.
Bone count fluctuates randomly without a pattern.
What does the material state about bone shape and size across the body?
All bones have identical shapes and sizes in every location.
Bones vary in shape and size depending on their locations within the body.
Bone shapes change only during injury, not by location.
Bone size is constant, but shape varies only in the limbs.
Refer to the labeled long bone diagram: Which term names the long shaft of a long bone between its proximal and distal ends?
Epiphysis
Diaphysis
Periosteum
Endosteum
Match each long bone part to its definition.
Diaphysis
Long shaft of the bone
Epiphysis
End of the bone (proximal or distal)
Periosteum
Tough membrane covering bones
Endosteum
Membrane lining the medullary canal
According to the diagram, where is red marrow typically located in a long bone?
Within spongy bone near the epiphysis
Inside the medullary canal of the diaphysis
Embedded in compact bone tissue
On the outer surface beneath the periosteum
Which function is correctly paired with yellow marrow?
Produces blood cells
Stores fat cells
Forms articular cartilage
Lines the medullary canal
Which component covers the ends of long bones at joints to reduce friction?
Articular cartilage
Periosteum
Endosteum
Compact bone tissue
Bones of the extremities (arms and legs) belong to which category?
Short bones
Flat bones
Irregular bones
Long bones
Which statement best describes the axial skeleton?
It forms the extremities (arms and legs)
It forms the trunk of the body
It includes the shoulder and pelvic girdles
It is composed mainly of long bones
Select all bones that are components of the axial skeleton. There are 4 answers.
Skull
Spinal column
Ribs
Sternum
Pelvic girdle
Which list shows only parts of the appendicular skeleton?
Skull, ribs, sternum
Shoulder girdle, arm bones, pelvic girdle, leg bones
Spinal column, ribs, sternum
Skull, spinal column, pelvic girdle
Match each skeleton type to what it forms in the body.
Axial skeleton
Trunk of the body
Appendicular skeleton
Extremities (arms and legs)
Both skeletons
Complete human skeleton when combined
Which component belongs to the appendicular skeleton but not the axial skeleton?
Sternum
Spinal column
Shoulder girdle
Ribs
In the lateral skull diagram, which bone forms the lower jaw and contains the mental foramen?
Mandible
Maxilla
Zygomatic bone
Nasal bone
Select all structures that are part of the cranium (neurocranium) in the lateral skull image.
Frontal bone
Parietal bone
Occipital bone
Maxilla
Mandible
According to the Skull overview card, which statement correctly describes sutures?
Openings that transmit cranial nerves
Air-filled cavities that lighten skull bones
Areas where bones of the skull have joined together
Cartilage plates that remain flexible throughout life
From the Skull overview card, which option correctly defines sinuses?
Soft membranous gaps in the cranium at birth
Air spaces in the bones of the skull
Channels for blood vessels to pass through bone
Movable joints between the facial bones
Which statement best describes the spinal column?
It is made of 26 bones called vertebrae and protects the spinal cord.
It is a single long bone that connects the ribs to the sternum.
It is a flexible muscle that supports breathing.
It is a cartilage-only structure found only in the neck.
Refer to the diagram of the colored vertebral regions. Which region has 12 vertebrae?
Cervical
Thoracic
Lumbar
Sacrum
Which functions are performed by the spinal column? Select all that apply.
Protects the spinal cord
Supports the head and trunk
Pumps blood to the brain
Stores minerals for energy
Match each vertebral region to the correct number of vertebrae.
Cervical
7
Thoracic
12
Lumbar
5
Coccyx
4 (fused)
According to the rib classification described, which ribs are considered true ribs?
Ribs 1–7
Ribs 8–12
Ribs 11–12 only
Ribs 1–10
Which statement correctly explains why ribs 11–12 are called floating ribs?
They attach directly to the sternum with long cartilage.
They have no attachment on the front of the body.
They are the only ribs connected to the cervical vertebrae.
They are fused to the sacrum.
Which structure do true ribs attach to at the front of the body?
Sacrum
Sternum
Coccyx
Lumbar vertebrae
In the forearm, two parallel bones run between the elbow and wrist. Which pair lists both of these bones?
Humerus and Carpals
Radius and Ulna
Metacarpals and Phalanges
Carpals and Metacarpals
Use the hand diagram that labels palm and fingers. Which group of bones makes up the palm of the hand?
Phalanges
Carpals
Metacarpals
Humerus
Select all groups that belong to the fingers according to the labeled hand diagram in your notes.
Phalanges
Carpals
Metacarpals
Using the pelvic girdle diagram, what bone is directly superior to the coccyx?
Sacrum
Ilium
Pubis
Ischium
In the leg bones list, which bone is the kneecap?
Femur
Patella
Tibia
Fibula
Which bones of the lower limb are paired long bones of the leg (below the knee)? Select all that apply.
Femur
Tibia
Fibula
Patella
Which statement best defines a joint, based on the instructional text?
A junction where two or more bones join together
A place where a single bone bends in the middle
A location where muscles attach to bones only
A cavity filled exclusively with synovial fluid
According to the material, what are ligaments?
Bands of muscle that move bones at joints
Connective tissue bands that help hold long bones together at joints
Cartilage pads that prevent bone friction in all joints
Nervous tissue strands that transmit signals across joints
Match each joint classification to its level of mobility as described.
Diarthroses (Synovial)
Freely movable
Amphiarthrosis
Slightly movable
Synarthrosis
Immovable
Which example belongs to a diarthrosis (synovial) joint?
Suture joint of the cranium
Joint between the two pelvic bones
Attachment of the ribs to the thoracic vertebrae
Ball and socket joint of the shoulder
Identify the joints listed in the text that are classified as hinge joints.
Elbow
Knee
Shoulder
Cranium sutures
Which joint type is described as immovable, and what example is provided?
Diarthroses; ball and socket of the shoulder
Synarthrosis; suture joints of the cranium
Amphiarthrosis; joint between the two pelvic bones
Synarthrosis; hinge joints of the knee
