Question

question 7
1.5 pts
the knee joint is an example of a ____________.
ball and socket jointhinge joint
pivot joint
saddle joint

question 8
1.5 pts
the shoulder joint is an example of a ____________.
hinge joint
ball and socket joint
pivot joint
saddle joint

Explanation:

• Question 7: A hinge joint allows movement in one plane (flexion and extension), similar to a door hinge. The knee joint primarily moves in flexion (bending) and extension (straightening), which is characteristic of a hinge joint. A ball - and - socket joint (like the shoulder) allows multi - directional movement (flexion, extension, abduction, adduction, rotation). A pivot joint (e.g., between the radius and ulna near the elbow) allows rotational movement. A saddle joint (e.g., the carpometacarpal joint of the thumb) allows movement in two planes but with a different range of motion compared to a hinge.
• Question 8: The shoulder joint is a ball - and - socket joint. The head of the humerus (ball) fits into the glenoid cavity of the scapula (socket). This structure enables a wide range of movements such as flexion (lifting the arm in front), extension (moving the arm backward), abduction (lifting the arm to the side), adduction (lowering the abducted arm), and rotation (twisting the arm). A hinge joint (like the knee) has a more limited range of motion (flexion and extension). A pivot joint allows rotational movement, and a saddle joint has a different type of biaxial movement compared to the multi - directional movement of the shoulder.

Answer:

• Question 7: hinge joint
• Question 8: ball and socket joint