Muscle Anatomy
The repeating functional unit between two Z-lines responsible for muscle striations.
What is the Sarcomere?
What are fast- and slow-twitch muscles?
A motor neuron and all the muscle fibers it stimulates form this functional unit.
What is a motor unit?
This type of contraction occurs when a muscle shortens while producing force.
What is Concentric Contraction?
This is the fixed attachment point of a muscle.
What is the origin?
These protein filaments slide past each other during contraction and are made of actin and myosin.
What are Myofilaments?
These fibers are typically used in explosive activities like sprinting or jumping.
What are fast twitch muscles?
The principle stating that a muscle fiber either contracts fully or not at all.
What is the all or none principle?
This contraction produces force without changing the muscle’s length.
What is Isometric Contraction?
The primary movement a muscle produces is called this.
What is the muscles function?
This connective tissue covers the entire skeletal muscle and protects it from injury.
What is the Epimysium?
This protein stores oxygen in muscle cells and is abundant in slow-twitch fibers.
What is Myglobin?
This neurotransmitter carries the signal from the neuron to the muscle fiber.
What is Acetylocholine (ACh)
Lowering a weight slowly during a bicep curl is an example of this contraction type.
What is Eccentric Contraction?
This muscle originates on the ischial tuberosity, inserts on the tibia and fibula, and its function is to flex the knee and extend the hip.
What is the Hamstring?
This structure stores calcium ions and releases them to trigger muscle contraction.
What is the Sarcoplasmic Reticulum?
In the eye you find this type of muscle fiber.
What is Fast Twitch? (Type IIb)
This is the point where a motor neuron communicates with a muscle fiber.
What is the Neuromuscualr Junction?
Holding a plank position without moving your body requires the muscles to produce force without changing length.
What is Isometric Contraction?
This muscle originates on the scapula and clavicle, inserts on the humerus, and its main function is to abduct the arm at the shoulder.
What is the deltoid?
The contractile structures inside muscle fibers that contain actin and myosin.
What is Myofibrils?
These muscle fibers have characteristics of both slow and fast fibers and can use both aerobic and anaerobic energy systems.
What is Type II A Muscle Fibres?
After acetylcholine binds to receptors on the muscle fiber’s sarcolemma, this electrical signal spreads along the membrane and triggers contraction.
What is an action potential?
Standing up from the bottom of a squat causes the quadriceps to shorten as they extend the knees.
What is Concentric Contraction?
This muscle originates on the occipital bone and vertebrae, inserts on the scapula and clavicle, and functions to elevate and retract the scapula.
What is the Trapezius?