Skeleton ๐ Flashcards
Hydrostatic Skeleton
Fluid filled components.
Advantage of hydrostatic Skeleton
Allows animal to be flexible.
Disadvantage of Hydrostatic Skeleton
No protection from getting injured
Exoskeleton
Hard protective structure found on outside of animal.
Examples of Exoskeletons
Arthropods ( Crabs , insects and locusts )
Examples of Hydrostatic skeletons
Jelly fish , earth worm and flat worms
Exoskeleton made of
Chitin
Chitin
Hardened with calcium carbonate
Endoskeleton
Hard structure found within animals (Vertebrates)
Advantage of Endoskeleton
Flexibility.
Grows as animal grows
Disadvantage of Endoskeleton
If damaged takes long time to repair.
1.Functions of Skeleton
Support the body
- Function of Skeleton
Protects soft organs
- Function of Skelton
Movement due to attached skeletal muscles.
- Function of skeleton
Store fats and minerals
- Function of Skeleton
Blood cell formation
Human skeletal components
206 bones
Cartilage
Tendons
Ligaments
Joints
Cartilage
Prevents friction found between bones.
Tendons
Attach bones to muscles.
Ligaments
Attach bones to bones
Joints
Found between 2 bones which allows for movement of bones.
4 types of bones
Short bones
Flat bones
Long bones
Irregular bones
Short bones e.g
Phalanges
Flat bone e.g
Skull
Long bones e.g
Femur
Irregular bones e.g
Vertebrate
2 รท of skeletal system
Axial and Appendicular
Axial Skeleton
Support, protect organs of head , neck and torso ( trunk )
Appendicular
Skeleton includes bones of limbs and bones that anchor them.
Axial Skeleton consists of :
Skull
Vertebrate column
Ribcage and sternum
Appendicular Skeleton consists of :
Girdle and limbs
Pectorial girdle
Upper limbs
Pelvic girdle
Lower limbs
Pectorial girdle
Clavicle
Upper limbs
Arms
Pelvic girdle
Sacrum, coccyx
Lower limbs
Legs
Skull structure bones
8 structured bones , attachments for muscles.
13 structured bones and mandibles
Skull structure 2
Cranium and facial bones
Skull function
Cranium encloses and protects brain.
1.Vertebral column structure
Separated by invertebral discโs made of cartilage.
- Vertebral column structure
Spine has normal curvature.
Each vertebrate is given a name to location
Vertebrate column.
Separated by inevitable discโs made of cartilage.
1st vertebra
Atlas
2nd vertabra
Axis
Vertebrae
Small bones
Vertebrae
Protect spinal cord
Vertebral column provides
Vertical support for the body.
Cartilage disc function
Act as shock absorbers
Allows flexibility of vertebral column
Ribcage and sternum
Breastbone forms ribcage and protects โก and lungs
Intercoastal muscles
Assit in the process of inhalation and exhalation during breathing.
Ribcage and sternum structure
True ribs - 1 to 7 directly attached to sternum.
False ribs - 8 to 10
Two pairs of floating ribs
Pectorial girdle and upper limbs structure
Pectorial girdle = 2 scapulae (shoulder blades)
2 clavicles (collar bones )
Upper limbs
Humorous
Radius and ulna
8 carpal bones
5 metacarpal bones
14 phalanges
Humorous
Upper arms
Radius and ulna
Fore arm
8 carpal bones
Wrist
5 metacapral bones
Palm
14 phalanges
Thumb and fingers
Pelvic girlde and lower limbs
Pelvic girlde = 2 hip bones fused into vertebral column
Lower limbs
Femur
Patella
1 tibia
1 fibia
7 tarsal bones
5 metacarpals
14 phalanges
Femur
Thigh bone
Patella
Knee cap
1 tibia
Shin bone
1 fibia
Calf bone
7 tarsal bones.
Ankle bones
5 metacarpals
Foot bone
14 phalanges
Toes
Structure of long bone
Head with long shaft between.
Function of long bone
Bones protect internal organs.
Endoskeleton gives body shape.
Forms bony Skeleton in Animals.
Hyoid bone
Only bone that does not articulate with another bone.
Bones of human body
Compact bone
Spongy bone
Spongy bone
Small needle like pieces of bone.
Many open spaces
Joints
Occurs where 2 or more bones meet
Immovable joints ( fibrous )
No movement e.g cranium
Slightly movable
Slight movement
E.g between vertebrate or lower spine
Freely moveable ( synovial)
Allow free movement e.g knee and elbow
Examples of synovial joints
Hinge joints
Ball and socket
Pivot
Gliding joints
Capsular ligament
Holds joints together
Ligament
Jones 2 bones together
Articular cartilage
Act as shock absorber
Spongy bones
Prevents friction
Synovial membrane
Secrets synovial fluid which is also prevents friction
Synovial joint
Bone
Synovial membrane
Spongy bone
Articular cartilage
Ligament
Capsular ligament
Ball and socket
Radial movement in every direction Hips and shoulders
Hinge
Extention and refraction of appendage
Gliding
Sliding and twisting wrist and ankle.
Osteoporosis
Bone is broken down faster that it can be build. Bones get weak and brittle fracture easily.
Risk factors of osteoporosis
Inadequate calcium
Little weight
Drinking
Female
Rickets
Softening and weakening of bones in children because of extreme snd prolonged vitamin D deficiency
Arthritis
Joint inflammation usually affects peole over the age of 50
Skeletal muscles
Voluntary muscles
Antagonistic muscles
Voluntary muscles are
Muscles attached to the bones of human skeleton
Antagonistic muscles
Skeletal muscles operate in pairs
Skeletal muscles structure
Consists of bundles of long cells called Fibre that are parallel to one another.
Units of each muscles
Sacromeres
Sacromeres
Give fibres stripped or striated appearance
Sarcolemma
Membrane around muscle Fibre
Myofibris
Smaller units
Consists of protein filaments called actin snd myosin
Actin filaments
Thinner than myosin filaments
Cartilage
Found at end of bones in joints between the ribs and sternum
Cartilage function
Keeps trachea open at all timesn