Chapter 6- Articulations Flashcards
Synarthroses
An immovable joint (fibrous joint)
Amphiarthroses
A joint allow slight mobility
Diarthroses
Allows free mobility (humerus)
Ball and Socket
The head of the bone fitting into a shallow depression ex)femur, glenoid fossa of the scapula
Hinge
Knee joint and elbow joint
Pivot
The ring of the bone rotates around the process of another
Gliding
Bones that can slide over each other that occurs in caprals and tarsals
Saddle
The bones have a saddle shape
ex) carpals and metacarpals
Condyloid
Oval-shaped condyle of one bone fits into an elliptical shape of another.
ex) metacarpals join the phalanges
Describe the functions of the skeletal muscles?
Movement- Skeletal Muscles attach to the bones.As muscles contracts it pulls on the bone or bones to produce movement.
Insertion Bone- Moveable End toward an origin bone which is the fixed end.
Heat Protection-the heat contributes to the maintenance of body temperature
Posture- Helps maintain an upright stance and posture of the body
What is a motor unit?
One neuron and a group of muscle fibers
Myofibrils
Organelles that establish the contractile ability of muscle cells
Sarcomeres
Contains the contractile proteins (myofilaments) actin and myosin
Myosin
Thicker central protein
Actin
Thinner protein at eac end of the sarcomere
