Muscle structure
They are units of overlapping myosin and actin fibers inside a muscle fiber.
What are sarcomeres?
It's the neurotransmitter that is released by a motor neuron, to stimulate a muscle fiber.
What is acetylcholine?
It's the shaft of a long bone.
What is the diaphysis?
These are joints between bones tightly connected to each other, with little to no movement.
It's the part of the skeleton composed of the skull, thoracic cage, and vertebral column.
What is the axial skeleton?
It's a group of muscle fibers that all respond together to a neuron's stimulus.
What is a motor unit?
It's the metal ion that is responsible for preparing binding sites so that cross-bridges can form.
What is calcium?
It's the tightly packed bone tissue that forms the outer wall of the shaft of a long bone.
What is compact bone?
This is the type of joint found in the shoulder and hip.
What is a ball-and-socket joint?
This type of muscle tissue does not have striations and is involuntary.
What is smooth muscle?
It's the muscle that is most responsible for a particular skeletal movement.
What is a prime mover?
It's the energy molecule that causes myofibrils in the sarcomeres to move past each other.
What is ATP?
It's the thin covering of fibrous tissue on the outside of a bone.
What is periosteum?
This is the type of joint found in the knee and elbow.
What is a hinge joint?
These are the cylindrical units that make up compact bone tissue.
What are osteons?
It's where a muscle connects to a less moveable bone.
What is a muscle origin?
It's when a muscle is no longer able to contract due to lactic acid build-up.
What is muscle fatigue?
It's where blood cells are formed.
What is the red marrow?
This the type of joint found in the thumb.
What is a saddle joint?
This is the central cavity in a long bone, where red bone marrow is found.
What is the medullary cavity?
It's where a motor neuron interacts with a muscle fiber.
What is a neuromuscular junction?
It's the energy molecule stored in muscle fibers to begin contractions, before aerobic respiration starts.
What is creatine phosphate?
They are bone cells.
What are osteocytes?
These are the category of joints that are freely moving and found mostly in the appendicular skeleton.
What are synovial joints?
This is the amount of neural stimulus needed to initiate a muscle fiber contraction.
What is a threshold stimulus?