Muscle physiology Quiz

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

• Motor neuron

• Muscle fiber

• Muscle

• Nerve

What is the contractile unit of the muscle?

• Z disk

• Sarcomere

• Muscle fiber

• Muscle cell

What protein makes up the thick filaments?

• Troponin

• Tropomyosin

• Myosin

• Actin

What part of the muscle fiber stores Ca ions and releases them when stimulated?

• T tubule

• Sarcolemma

• Nucleus

• Sarcoplasmic reticulum

What is the name of the location where the neuron and muscle fiber meet?

• Sarcoplasm

• Sacolemma

• Neuromuscular junction

• Axon terminal

Which of the following muscle types are voluntary?

• Skeletal

• Cardiac

• Smooth muscle

What are the three types of muscles?

• voluntary, smooth, cardiac

• cardiac, skeletal, nervous

• cardiac, smooth, skeletal

• smooth, cardiac, stomach

Vesicles in the motor neuron store what substance?

• cholinsterase

• acetylcholine

• calcium

• curare

Which of these statements is correct regarding muscle contraction?

• All motor units act together
• Muscle contraction continues for long periods after nervous stimulation ceases
• The crossbridges bind to the actin and shorten the sarcomeres
• Troponin is not needed to strengthen the contracting muscle cell.

Name the structure labeled #1 in diagram.

• endomysium

• epimysium

• perimysium

• myofibril