What is X? It is the physical space between two neurons across which a nerve impulse is transmitted by a neurotransmitter.

What is X? It is a small secretory vesicle that contains a neurotransmitter, is found inside an axon and releases it contents into the synaptic cleft after fusing with the membrane.

What is this structure? It consists of one motor neuron and all the muscle fibers its stimulates.

What is this structure? It is a modified are of the muscle fiber membrane at which a synapse occurs. A single muscle fiber only has one _______________.

Identify the red structures? A fibrous protein that forms (together with actin) the contractile filaments of muscle cells.

Identify the blue structures? a protein that forms (together with myosin) the contractile filaments of muscle cells.

Identify X? A protein that covers the mysoin binding sites on the actin filament in a relaxed muscle, preventing contraction.

Identify the pink structures? It is a globular protein complex, occuring with tropomyosin in the thin filaments of muscle tissue. Binds to calcium ions, moving tropomyosin away from the myosin binding sites on actin filaments.

Identify the structure. It binds to thin filamentous actin, and uses ATP hydrolysis to generate force and "walk" along the thin filament.

Identify the structure. It is the high-energy/attached state when myosin is loaded with potential energy and attached to actin.

This term refers to when myosin and actin contract to "pull the trigger".