Muscle Movements
What is Flexion?
This type of muscle movement decreases the angle at a joint.
What is the belly of a muscle?
The middle portion of a muscle, often the thickest.
What are synarthroses?
Joints that allow no movement
What is a sarcomere?
The basic contractile unit of a muscle fiber.
What is skeletal muscle?
This type of muscle is voluntary and attached to bones.
Are triceps Agonist, Antagonist, Synergist, Fixator compared to the bicep? And What does it do?
Antagonist. When the biceps contract, this muscle group must relax to allow movement.
What is the insertion?Where does the bicep muscle insert?
The point where a muscle attaches to the more movable bone. The bicep muscle inserts on the radial tuberosity
What are diarthroses?
Joints that allow free movement
What are myofibrils?
These thread-like structures inside muscle fibers contain actin and myosin.
What is muscle tone?
The resting state of a muscle.
What are synergists?
Muscles that assist the primary mover (Agonist) in an action.
What are circular muscles?
Muscles that form a circle around an opening, like the mouth.
What is a symphysis?
his type of joint connects bones using fibrocartilage.
What is the sarcolemma?
This specialized membrane surrounds each muscle fiber.
What is isometric contraction?
The strongest type of muscle contraction where the muscle length does not change (static).
What are fixators?
Muscles that stabilize a joint during a movement.
hat is a parallel (fusiform) muscle?
A muscle with fibers running parallel to its long axis.
What is a meniscus tear?
A torn cartilage in the knee
What is sarcoplasm?
The cytoplasm of a muscle cell
What is lactic acid?
Muscle fatigue is primarily caused by the accumulation of this chemical.
What is dorsiflexion?
Lifting your toes up toward your shin.
What is the origin?
The bone attachment that does not move during contraction.
What is biaxial movement?
The condyloid joint allows this type of movement at two axes without rotation.
What is the difference between myosin and actin?
Myosin and actin are both proteins in muscle fibers. Myosin is the thick filament responsible for pulling, while actin is the thin filament that is pulled.
What is acetylcholine (ACh)?
This neurotransmitter is released at the neuromuscular junction to trigger muscle contraction.