Bone MAtrix
These minerals provide 60-70% of bone weight and resist pressing forces.
What are Calcium Carbonate and Calcium Phosphate?
This is the name for the long, hollow shaft of a long bone.
What is the Diaphysis?
This "thin" protein filament slides toward the center during a muscle contraction.
What is Actin?
This neurotransmitter is released into the junction to signal a contraction.
What is Acetylcholine (ACh)?
This isotonic contraction occurs when the muscle fibers shorten.
What is a Concentric Contraction?
This protein provides bone with flexibility and resistance to pulling forces.
What is Collagen?
Found at the ends of long bones, this region is covered in articulating cartilage.
What is the Epiphysis?
This "thick" protein filament features heads that attach to form cross-bridges.
What is Myosin?
This principle states that all fibers in a motor unit fire fully or not at all.
What is the All-or-None Principle?
This contraction involves the muscle lengthening while generating tension.
What is an Eccentric Contraction?
High-porosity bone that contains a "strut-like" system of fibers.
What is Cancellous (Spongy) Bone?
This outer connective tissue covers the entire bone except for the joints.
What is the Periosteum?
This ion must bind to troponin to move tropomyosin out of the way.
What is Calcium (Ca2+)?
This junction is the contact point between a motor neuron and a muscle.
What is the Neuromuscular Junction?
In this "static" contraction, tension is created but muscle length stays the same.
What is an Isometric Contraction?
These specific cells are responsible for removing or "resorbing" old bone.
What are Osteoclasts?
These bony fibers mesh with bone marrow and adjust density based on stress.
What are Trabeculae?
This energy molecule is required to detach the myosin head from the actin.
What is ATP?
This cord-like protein covers the binding sites on the actin filament at rest.
What is Tropomyosin?
This is the stationary point of attachment for a muscle, usually on the axial skeleton.
What is the Origin?
These bone-forming cells deposit new tissue during the remodeling process.
What are Osteoblasts?
This is the medical term for the process of blood cell formation in marrow.
What is Hematopoiesis?
This is the repeating functional unit of a myofibril, located between Z-lines.
What is a Sarcomere?
These rings surround the myofibril and link the outside of the fiber to the inside.
What are Transverse Tubules (T-tubules)?
This is the muscle that must relax to allow the prime mover (agonist) to contract.
What is the Antagonist?