Planes, axises, levers, chains, degrees of freedom

I don't fucking know anymore okay im trying but manifesting that A and hopefully my grade puts everyone else to shameeeeeeee!!

the frontal, saggital, and transverse planes all intersect at the ____

center of gravity (COG)

1st class lever

resistance and effort on opposite sides of fulcrum// seesaw, scissors

2nd class lever

load is closer to fulcrum than resistance// wheelbarrow, calf raise, nutcracker

3rd class lever

effort is close to fulcrum than resistance// good for speedy force generation to move small things// broom, biceps

open chain movement

limbs can move freely in space// better for mobility

closed chain movement

limbs are fixed to a surface // better for stability

frontal (coronal plane)

divides body into anterior and posterior

movement occurs around mediolateral axis, sagittal axis, z axis

sagittal plane

divides body into left and right halves

movement occurs around frontal axis, anterior-posterior axis, x axis

transverse plane

divides body into top and bottom

movement occurs around longitudinal axis, y axis

joints classified by

how much movement and tissue type than connects the joints

the ones we care about are diarthroses (very movable) and are often synovial

condyloid joint

MCP joints of hand// between radius and carpal bone

2 DOF// f/e and ab/ad

pivot joint

atlantoaxial joint// humero radial joint

1 DOF// rotation

saddle

carpometacarpal joint of thumb

2 DOF// /f/e and ab/ad

hinge (ginglymus)

knee, elbow

1 DOF f/e

ball and socket

shoulder, hip

3 DOF f/e and ab/ad/ and rt