Mechanism of Muscle Contraction

What is the function of this entire diagram?

• controlling a nerve

• controlling a skeletal muscle contraction

• endocytosis

• inserting a musle on a bone

Click all that apply. Which of these make up a motor unit?

• Motor neuron

• Muscle Fibers

• Muscle

• Nerve

Skeletal Muscle contraction is initiated when the ________ sends a message/signal to the muscle cell.  

• Muscle cell

• Motor Neuron

• Gland

• None of the above

The physical gap space between the neuron and sarcolemma of the muscle fiber is the ____ ___.

• Synaptic cleft

• Neurotransmitter

• Motor unit

• Neuromuscular junction

What is number 6 pointing to?

• a muscle cell

• a synaptic vesicle

• a neurotransmitter

• a neuron

Identify structure 3 in the diagram.

• synaptic cleft

• motor end plate

• axon terminal

• ACh

Identify structure 1 in the diagram.

• synaptic cleft

• motor end plate

• axon terminal of motor neuron

• ACh

____________ attaches to actin to form the cross bridge.

• Troponin

• Tropomyosin

• Myosin

• Calcium

Use to move materials through contractions

• smooth

• cardiac

• skeletal

• all

What is shown in the colored part of this diagram?

• a whole muscle

• five muscle fibers

• five muscle fascicles

• five myofibrils