Bones 1
Bones 2
Joints 1
Joints 2
Muscles 1
Muscles 2
More Muscles!
100
Osteocytes are mature bone cells and live in these small depressions.
What are lacunae?
100
One function of the skeletal system is hematopoiesis, which means this.
What is blood cell production?
100
Synovial joints are synonymous with this functional classification.
What is diarthrosis?
100
Spreading your fingers is this type of movement.
What is abduction?
100
Another name for muscle cell.
What is muscle fiber?
100
This muscle type relies completely on the nervous system for contraction.
What is skeletal muscle?
100
The advantage of skeletal cells being multi-nucleated.
What is lots of protein production?
200
These are young bone cells and produce bone matrix and collagen fibers.
What are osteoblasts?
200
Compact bone contains blood vessels that reside in this part of the osteon.
What is the central canal?
200
A cranial suture falls into this functional classification.
What is synarthrosis?
200
Lubrication is one function of this.
What is synovial fluid?
200
The functional unit of a muscle fiber.
What is the sarcomere?
200
The connective tissue that attaches muscle to bone.
What is tendon?
200
The organelle responsible for ATP production.
What is the mitochondrion?
300
These bone cells have yet to develop into a particular cell.
What are osteogenic stem cells?
300
The connective tissue that joins one bone to another.
What are ligaments?
300
The pubic symphysis is this type of articulation.
What is cartilaginous?
300
The type of joint that allows your thumb to be oppositional to your other fingers.
What is saddle joint?
300
The fusion of many myoblast cells results in this unique characteristic of skeletal muscle.
What is multi-nucleated?
300
The neurotransmitter that is released from vesicles into the synaptic cleft.
What is acetylcholine (ACh)?
300
At rest, the actin binding sites are blocked by this protein.
What is tropomyosin?
400
Derived from monocytes, these cells break down bone matrix.
What are osteoclasts?
400
Bones function as storage for this, which can be released when blood levels get too low.
What are calcium ions?
400
arthritis starts with wear and tear on this.
What is articular cartilage?
400
Bending you elbow reduces the angle of the joint, making it this type of movement.
What is flexion?
400
Thick filaments are composed of this protein.
What is myosin?
400
The influx of this at the terminal end of the neuron causes the release of neurotransmitter.
What are calcium ions (Ca++)?
400
Myosin releases its attachment to actin after this attaches to the myosin head.
What is ATP?
500
The percentage of bone that is made up of cells.
What is 2%?
500
The part of a long bone involved in articulation.
What is the epiphysis?
500
The structural joint that allows articulation of the mandible.
What is synovial?
500
Rotating the wrist so the palm is anterior, is this type of movement.
What is supination?
500
In addition to actin, thin filaments contain these two proteins.
What is troponin and tropomyosin?
500
During a contraction, the thick filaments pull the thin filaments towards this.
What is the M line?
500
Maximum muscle tension without relaxation is called this.
What is tetanus?
600
The molecule that stimulates absorption of calcium and phosphate ions from the small intestine.
What is calcitriol (vitamin D)?
600
The substance that makes up about 2/3rds of bone mass.
What is calcium phosphate?
600
The type of synovial joint between articulating carpals.
What is plane or gliding?
600
The synovial joint that allows maximal movement.
What is ball-and-socket?
600
Many tandem sarcomeres, or the grouping of thin and thick filaments, are collectively called this.
What is a myofibril?
600
Where a neuron communicates with a muscle fiber.
What is the neuromuscular junction (NMJ)?
600
The collective term for all the muscle fibers innervated by a single motor neuron.
What is a motor unit?
700
The roof of the skull and the clavicles ossify using this method.
What is intramembranous ossification?
700
Longitudinal bone growth happens at this location in a long bone.
What is the epiphyseal plate?
700
The definition of amphiarthrosis.
What is slightly moveable?
700
The atlantoaxial joint is an example of this type of joint.
What is pivot?
700
The extension of the sarcolemma into the cell that surrounds each myofibril.
What are T-tubules?
700
T-tubules allow this to travel from the sarcolemma to the interior of the cell.
What is an action potential?
700
The molecule that acts as an energy reserve when ATP is needed quickly.
What is creatine phosphate?
800
The process of replacing cartilage with bone.
What is endochondral ossification?
800
The crystal form of calcium phosphate.
What is hydroxyapatite?
800
ankle extension can also be called this type of movement.
What is plantar flexion?
800
The bones of the pelvis are held together by this type of structural joint.
What is fibrous?
800
Specialized organelle that stores calcium ions.
What is the sarcoplasmic reticulum?
800
Influx of this into the sarcolemma at the motor end plate allow an action potential to propagate along the membrane.
What are sodium ions (Na+)?
800
This happens when an action potential quickly follows after another.
What is wave summation?
900
The osteon consists of these circles within circles.
What are concentric lamellae?
900
The term for when bones grow in diameter.
What is appositional growth?
900
Forming a fist is this type of movement.
What is flexion?
900
When you rub your tongue along your upper teeth, you do this to your mandible.
What is protract?
900
The leading theory behind muscle contraction.
What is the sliding filament theory?
900
An action potential stimulates release of calcium ions from the SR so it will bind to this.
What is the protein troponin?
900
The term that links the action potential signal to muscle contraction.
What is excitation-contraction coupling?