Muscle Contraction 2

Myosin filaments are also called _ filaments.

• myosin

• sarcomeres

• actin

• neurons

In the center of the H zone, consists of proteins that hold the myosin filaments in place.

• A line

• I line

• M line

• H line

Muscle contraction is stimulated when this specific neurotransmitter is released into the synaptic cleft. What is the name of this neurotransmitter?

• Neurotensin

• Acetylcholine

• Cholecystokinin

• Norepinephrine

Parallel strands of fibers in muscle fibers that are active in muscle contraction (Letter C) is called _________.

• Sarcolemma

• Sarcoplasm

• Sarcoplasmic reticulum

• Myofibril

The ____________________________ contains specific receptors for the neurotransmitter.

• Synaptic cleft

• Motor end plate

• Neuromuscular junction

• Synaptic vesicle

The gap between the membranes of the neuron and muscle fiber. It is here that synaptic vesicles release neurotransmitter.

• Synaptic cleft

• Motor end plate

• Neuromuscular junction

• Synaptic vesicle

A synapse between a motor neuron and a muscle fiber that it regulates.

• Synaptic cleft

• Motor end plate

• Neuromuscular junction

• Synaptic vesicle

Each skeletal muscle fiber (cell) is functionally (not physically) connected to the axon of a motor neuron, creating a ______.

• Synaptic cleft

• Neurotransmitters

• Neuromuscular junction

• Synapse

Located at the end of the motor neuron along with numerous mitochondria are _____________, which store neurotransmitters.

• Synaptic cleft

• Motor end plate

• Neuromuscular junction

• Synaptic vesicle

A bands are made up of overlapping ___ and ___ filaments.

• A and I

• sarcomeres and actin

• H zone and myosin

• thin and thick