Podcast
Questions and Answers
What is the approximate percentage of inorganic material in the bones of a child?
What is the approximate percentage of inorganic material in the bones of a child?
- 65%
- 50% (correct)
- 35%
- 80%
What happens to the proportion of organic material in bones as a person ages?
What happens to the proportion of organic material in bones as a person ages?
- It fluctuates drastically.
- It increases.
- It remains constant.
- It decreases. (correct)
What is a potential consequence of bones having a high proportion of inorganic material?
What is a potential consequence of bones having a high proportion of inorganic material?
- Increased flexibility.
- Increased elasticity.
- Increased brittleness. (correct)
- Increased strength.
Why are bones more prone to fractures in the elderly?
Why are bones more prone to fractures in the elderly?
What property of bone allows it to bend under stress?
What property of bone allows it to bend under stress?
What is the primary function of the lever system formed by the long bones?
What is the primary function of the lever system formed by the long bones?
Which of the following types of bones have a length greater than width?
Which of the following types of bones have a length greater than width?
What is the name of the bony structure located at each end of a long bone?
What is the name of the bony structure located at each end of a long bone?
Which of the following bones are examples of short bones?
Which of the following bones are examples of short bones?
What is the term for the tubular shaft of a long bone?
What is the term for the tubular shaft of a long bone?
What type of cartilage is primarily found in 1º (Primary) cartilaginous joints?
What type of cartilage is primarily found in 1º (Primary) cartilaginous joints?
Which joint is classified as an inferior tibiofibular joint?
Which joint is classified as an inferior tibiofibular joint?
How many types of cartilaginous joints are identified?
How many types of cartilaginous joints are identified?
Which of the following statements is true regarding 1º (Primary) cartilaginous joints?
Which of the following statements is true regarding 1º (Primary) cartilaginous joints?
Which of the following types of cartilage is NOT typically found in cartilaginous joints?
Which of the following types of cartilage is NOT typically found in cartilaginous joints?
What is the main function of the cruciate ligaments in the knee?
What is the main function of the cruciate ligaments in the knee?
What type of synovial joint allows movement in several axes?
What type of synovial joint allows movement in several axes?
What is the characteristic feature of a ball and socket joint?
What is the characteristic feature of a ball and socket joint?
What determines the classification of synovial joints?
What determines the classification of synovial joints?
What is the term for the rounded head of a bone that fits into a concavity of another bone?
What is the term for the rounded head of a bone that fits into a concavity of another bone?
Which type of joint allows for only rotational movement?
Which type of joint allows for only rotational movement?
What characterizes the pivot joint structure?
What characterizes the pivot joint structure?
What type of movement is associated with the acromioclavicular joint?
What type of movement is associated with the acromioclavicular joint?
Which statement about the pivot joint is true?
Which statement about the pivot joint is true?
Which of the following statements is correct regarding motion at the acromioclavicular joint?
Which of the following statements is correct regarding motion at the acromioclavicular joint?
Study Notes
Bone Composition and Characteristics
- Bones consist of 35% organic material and 65% inorganic material, with variations occurring throughout life.
- In children, bone composition is roughly equal, around 50% organic and 50% inorganic.
- Damage to bones may result in bending due to elasticity or partial fractures.
- Aged bones tend to have a higher proportion of inorganic material, making them more brittle, leading to easier fractures.
- Common examples of skeletal bones include the clavicle, humerus, femur, metacarpals, metatarsals, and phalanges.
Bone Structure
- Long bones have a tubular shaft (diaphysis) with epiphyses at each end, characterized by a length greater than width.
- Short bones, such as carpal bones in the hand, have more equal dimensions.
- Some bones, like those in the skull, are classified as sutural bones.
Cartilaginous Joints
- Two types of cartilaginous joints exist: primary (1º) and secondary (2º).
- Primary joints are united by a plate of hyaline cartilage, such as cruciate ligaments, which help stabilize the knee joint.
Synovial Joints
- Classified based on articular surface arrangement and movement types.
- Ball and Socket Joints: Allow movement in multiple axes, featuring a rounded head fitting into a concavity (e.g., acromioclavicular joint).
- Pivot Joints: Facilitate rotational movement; consist of a round bony process fitting into a bony or ligamentous socket.
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Description
This quiz covers the composition of bones, including the ratio of organic to inorganic constituents, and how it changes throughout life. It also touches on how bones react to injury.
