Human bones, joints, skull anatomy, and skeletal structure.
Test your knowledge with these top questions!
Which pelvic structures carry body weight while a person sits upright?
Each sits on the lower rear part of a hip bone, below the broad ilium that forms the rim at the waist.
What does the human femur mainly do during standing and walking?
The femur's thick walls and slight forward curve help it absorb the force of each step.
What does yellow bone marrow in adult bones mainly store?
Yellow marrow is mostly fat cells and can turn back into blood-making red marrow after major blood loss.
Where does red bone marrow mainly remain in adult humans?
Long bone shafts fill with fatty yellow marrow with age, while hips, ribs, and vertebrae keep making blood.
Which lower-leg bone meets the human femur at the knee?
The tibia carries most of the lower leg's weight, while the thinner fibula mainly steadies the ankle.
Which condition specifically means inflammation of one or more joints?
Osteoarthritis wears down joint cartilage with age, while rheumatoid arthritis happens when immunity attacks joints.
How many pairs of human ribs connect directly to the breastbone?
The first seven pairs join the sternum by cartilage, while lower ribs join indirectly or float free.
Which vertebrae bear the most body weight in the human spine?
Lumbar vertebrae are the largest in the spine to support upper-body weight.
Which tendon links the kneecap to the shinbone below the knee?
The patellar tendon joins the kneecap to the tibia, passing force that straightens the lower leg.
What forms the hard outer wall of the shaft of a healthy human femur?
Dense outer bone surrounds a marrow cavity, while spongy bone is concentrated near the femur's ends.