The Skeletal System- Quiz Flashcards
Briefly describe the five functions of our bones
- Support
- leg bones support our trunk
- rib cage supports thoracic wall - Protection
- the skull protects the brain
- the rib cage protects the organs in thoracic cavity - Movement
- muscles, attached to bones by tendons, use bones as levers to move the body - Storage
- fat is stored in marrow
- calcium and phosphorus - Blood cell formation
Depressed fracture
- broken bone portion is pressed inward
- this is typical of a skill fracture
Compression fracture
- bone is crushed
- colon in porous bones (osteoporotic bones of old people)
Spiral
- ragged team occurs when excessive twisting forces are applied to bone
- common in sports
Impacted fracture
- broken bone ends are forced into each other
- occurs when a person tries to break a fall with straight arms
Greenstick fracture
- bone breaks incompletely, like the way a green twig breaks
- common in children because their bones are more flexible than adults
Comminuted fracture
- bone breaks into many fragments
- common in older people with brittle bones
Four properties of muscle cells
- excitability (responsive)
- contractibility (shorten forcibly)
- extensibility (stretch)
- elasticity (return to rest)
Briefly describe the four functions of our muscles
- Movement
- muscles, attached to bones by tendons, contract to move the body
- facial expressions, locomotion, peristalsis, etc - Stability
- maintains posture against gravity
- stabilizes joints - Generates heat
- ATP powers muscle contraction, energy is lost as heat - Additional functions
- protects organs
- regulates the passage of substances (dilate/constrict)
Where are skeletal muscles?
Attached to the body
Are skeletal muscles involuntary or voluntary
Voluntary
Where are the smooth muscles located in the body?
Stomach, bladder, etc
Are smooth muscles voluntary or involuntary?
Involuntary
Where are cardiac muscles located in the body
Only in the heart ❤❤❤
Are cardiac muscles involuntary or voluntary
Involuntary
