Physiology of Muscle Contraction

Which of the following is NOT a muscle function?

• Movement of skeleton
• Heat generation
• Transport substances around body
• Moves neurons around body

What is the name of the protein myofilament that pulls the actin towards the center of the Sarcomere?

• Fascicle
• Actin
• Myosin
• Titin

What is the name give to the thin protein filaments within the muscle contractile unit?

• Myosin
• Actin
• Myoglobin
• Haemoglobin

Which of the following is the name given to the connective tissue that covers of a muscle fascicle or bundle of muscle?

• Endomysium
• Perimysium
• Epimysium
• Myofilament

What is the name of the connective tissue covering that covers the entire muscle organ?

• Endomysium
• Perimysium
• Epimysium
• Fascicle

Which one of the following is a key characteristic of slow twitch muscle fibers? 

• They contain large amounts of Mitochondria
• They are fast to fatigue
• They are recruited last
• They contain low numbers of Mitochondria

Which one of the following is a key characteristic of Fast Twitch B muscle fibers? 

• They are Red in color, meaning they contain a lot of mitochondria
• They contract rapidly with great force but fatigue fast (as they use creatine phosphate pathway)
• They are recruited for long duration activities
• They contain high numbers of Mitochondria

What is the name given to the contractile units repeated along the myofibrils?  

• Fascicles
• Perimysium
• Sarcomere
• Fascia 

The segment of a myofibril that is called a sarcomere runs from _______________.

• one Z line to the next Z line
• one H zone to the next H zone
• one A band to the next A band
• one end of a skeletal muscle to the opposite end

Into what does the neuron release its neurotransmitter at the neuromuscular junction?

• motor end plate
• cytoplasm of the muscle cell
• terminal cisternae
• synapse