Muscle Structure

What is the name of the thick myofilament found in a sarcomere?

• Actin

• Myosin

• Myoglobin

• Titan

What is the name of the thin myofilaments in the muscle cell?

• Actin
• Myosin
• Myoglobin
• Titan

The contractile unit of a muscle is called the __________.

• Sarcolemma
• Sarcoplasmic reticulum
• Sarcoplasm
• Sarcomere

Number 3 represents which of the following events

• action potential reaches the axon terminal
• sodium rushes into the muscle fiber
• potassium leaving the muscle fiber
• ACh crossing the synaptic cleft

Contractions are generated by

• shortening of thick filaments
• shortening of thin filaments
• sliding of thin filaments past thick filaments
• "accordian-like" folding of thick and thin filaments

What are the two ions transported across the membrane in an action potential?

• O^2- and K⁺
• K⁺ and Na⁺
• Ca⁺² and B⁺³
• Na⁺¹ and Cl

Once calcium is released, it will

• attaches to myosin head
• attaches to receptors 
• attaches to tropomyosin
• attaches to troponin

Z represents

• Dendrite
• Axon Terminal
• Neurotransmitters
• Synapse

The actin is represented by the letter

• A
• B
• C
• D

Which statement best describes the location of the Perimysium?

• It surrounds the entire muscle.

• It surrounds the sarcomere.

• It surrounds each fascicle.

• It surrounds the myofiber.