Skeletal System
A tough and flexible connective tissue sometimes found lining joints and the ends of bones.
What is cartilage?
The smallest functional unit of a muscle.
What is a sarcomere?
A section of the axial skeleton that protects the spinal cord.
What is the vertebral column?
The largest muscle in the human body, found on the posterior side of the hips.
What is the gluteus maximus?
The nerve cell responsible for conducting impulses to motor units/muscle fibers.
What is a motor neuron?
The most flexible type of cartilage, which supports parts of the body that need to bend or move.
What is elastic cartilage?
Individual units that make up muscle fibers, composed of sarcomeres.
What is a myofibril?
The lowest part of the posterior view of the skull; Also referred to as the jaw.
What is the mandible?
What two main muscles are in the upper arm?
The space that separates the motor neuron ending from the sarcolemma of a muscle fiber.
What is the synaptic cleft?
Provides attachment points for muscles, protects internal organs, stores calcium and phosphate, and manufactures red blood cells.
What does bone/osseous tissue do?
Found at the middle of each sarcomere; The middle of the thick filaments, of which the H-zone is around.
Where is the M-line?
The individual bones in fingers and toes.
What are phalanges?
The muscle found in the outer portion of the shoulders.
What are the deltoids?
The neurotransmitter that binds with receptors on the motor end plate of the sarcolemma.
What is acetylcholine?
A lighter type of bone structure with no osteons/osteonic canal.
What is spongy (cancellous) bone?
The membrane that surrounds each muscle fiber.
What is a sarcolemma?
The two long bones found in the lower half of the leg.
What are the tibia and fibula?
The principal muscle involved in any movement/action.
What is an agonist?
Myosin binding sites on actin molecules are unblocked by tropomyosin.
What happens when calcium ions bind to troponin?
Forms new bone; Synthesizes and secretes collagen matrix.
What do osteoblasts do?
A component of muscle cells that surround myofibrils, and stores calcium ions and is closely associated with transverse tubules.
What is the sarcoplasmic reticulum?
The type of bone that comprises individual vertebrae, the pelvic bones, and bones in the skull.
What are irregular bones?
Myosin filaments bending, and binding to actin in the muscle cells.
What is cross-bridging?