Muscle Physiology Test

What is the contractile unit of the muscle?

• actin and myosin

• Sarcomere

• Muscle fiber

• Muscle cell

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 neurotransmitter that is released from the neuron to the sarcolemma?

• Acetylcholine

• Acetone

• ATP

• Calcium

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

• Sarcoplasm

• Sacolemma

• Neuromuscular junction

• Axon terminal

Which pathway produces 95% of the energy for muscles?

• Anaerobic Repsiration

• Glycolysis

• Direct Phosphorylation

• Aerobic Respiration

The A band contains which type of filaments?

• Only thick

• Only thin

• Both thick and thin

This is a picture of

• Tropomyosin

• Actin

• Myosin

• The thin filament

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 two chemicals are necessary for muscle contraction to occur?

• Niacin and Potassium
• Calcium and ATP
• Sodium and Potassium
• Ach and Potassium

given the following events:

1.acetycholine broken down

2.acetylcholine moves across the synaptic cleft

3.action potential reaches the terminal branch (presynaptic terminal)

4.acetylcholine combines with a receptor molecule on a skeletal muscle (postsynaptic membrane)

5.action potential produced in skeletal muscle cell

Choose the arrangement that lists the events in the order the occur at a neuromuscular injunction

• 2,3,4,1,5

• 3,2,4,5,1

• 3,4,2,1,3

• 4,5,2,1,3