A tissue has striations, voluntary control, and long multinucleate fibers attached to bones. Which muscle tissue is it?

A tissue in the walls of hollow organs contracts slowly without conscious control and lacks striations. Which muscle tissue is it?

A tissue is found only in the pumping organ of the circulatory system and contains branching, striated cells. Which muscle tissue is it?

Which muscle tissue uses intercalated discs to help cells contract as a coordinated unit?

Which muscle tissue moves food through the digestive tract by involuntary waves of contraction?

Which muscle tissue is controlled by somatic motor neurons at neuromuscular junctions?

What is the plasma membrane of a skeletal muscle fiber called?

Which structure stores and releases calcium ions inside a muscle fiber?

Which cylindrical bundle inside a muscle fiber is made of repeating sarcomeres?

What is the functional contractile unit from one Z disc to the next?

Which thin myofilament slides toward the center of a sarcomere during contraction?

Which thick myofilament has heads that form cross-bridges and pull on thin filaments?

Which connective tissue covering wraps a single skeletal muscle fiber?

After a motor neuron action potential reaches its axon terminal, what chemical is released into the neuromuscular junction?

What happens immediately after acetylcholine binds receptors on the motor end plate?

Calcium ions bind to which protein so binding sites on actin become exposed?

During the power stroke, what do myosin heads do to actin filaments?

Why does a sarcomere shorten even though the actin and myosin filaments do not shorten?

What is a motor unit?

If acetylcholinesterase were blocked at the synaptic cleft, what would most directly happen to the fiber?

Which energy source provides the fastest ATP regeneration for the first few seconds of intense contraction?

Which process supplies most ATP during long, steady activity when oxygen delivery is adequate?

When oxygen is limited during hard exercise, which product can accumulate and contribute to burning fatigue?

After sprinting, a person breathes heavily to restore ATP stores, clear lactate, and reoxygenate myoglobin. What is this called?

A muscle held in a cast for weeks loses size because it is not used. Which condition is this?

Repeated strength training increases the size of muscle fibers. Which adaptation is this?

Which muscle closes the eyelids, as when blinking or squinting?

Which powerful jaw muscle elevates the mandible during chewing?

Which paired neck muscle flexes the head and rotates it to the opposite side?

Which shoulder muscle abducts the arm after the first part of lifting it sideways?

Which chest muscle flexes and adducts the arm, as in a push-up or hug?

Which anterior upper-arm muscle flexes the elbow and helps supinate the forearm?

Which posterior upper-arm muscle extends the elbow?

Which calf muscle is a prime mover for plantar flexion when the knee is straight?

A muscle attaches to the sternum and clavicle at one end and to the mastoid process at the other. If the head moves, which attachment is the insertion?

The biceps brachii and triceps brachii act in opposite ways at the elbow. When biceps flexes the elbow, what role does triceps have?

The quadriceps extend the knee. Which muscle group on the posterior thigh commonly acts as the antagonist for that movement?

A skeletal muscle is wrapped by epimysium, and each muscle fiber is wrapped by endomysium. Which covering surrounds a fascicle?

During a squat, which large buttock muscle extends the hip as the body rises?

In muscular dystrophy, muscle fibers progressively degenerate. What direct consequence follows in affected skeletal muscles?