Muscle Structure
This is the basic functional unit of a muscle fiber
What is a sarcomere?
This muscle type is voluntary and striated
What is skeletal muscle?
Bending a joint decreases the angle; this is called
What is flexion?
This muscle flexes the elbow and supinates the forearm
What is the biceps brachii?
This molecule provides the energy for muscle contraction
What is ATP?
These are the contractile proteins in muscle (thin and thick)
What are actin and myosin?
This muscle type is found in the heart
What is cardiac muscle?
Straightening a joint is called
What is extension?
This muscle elevates the eyebrows and wrinkles the forehead
What is the frontalis?
This ion is released to trigger contraction
What is calcium?
A bundle of muscle fibers is called this
What is a fascicle?
This muscle type is non-striated and involuntary
What is smooth muscle?
Moving a limb away from the midline is
What is abduction?
This muscle closes the jaw
What is the masseter?
This is the junction between a neuron and a muscle fiber
What is the neuromuscular junction?
This connective tissue surrounds a single muscle fiber
What is endomysium?
These structures connect cardiac muscle cells
What are intercalated discs?
Turning the sole of the foot inward is
What is inversion?
This muscle plantar flexes the foot and helps you stand on your toes
What is the gastrocnemius?
This neurotransmitter stimulates muscle contraction
What is acetylcholine?
This connective tissue layer surrounds an entire muscle
What is epimysium?
This muscle type is responsible for peristalsis
What is smooth muscle?
This movement turns the arm inward toward the body
What is medial rotation?
This muscle is the prime mover for arm abduction
What is the deltoid?
This cycle describes myosin heads attaching and pulling actin
What is the cross-bridge cycle?