Muscle Review - Review #3

The neuron and the collection of muscle fibers it innervates is called the:

• neural impulse.
• motor neuron.
• muscle fiber.
• motor unit.

The functional contractile unit within muscle fiber is the:

• sarcoplasm.
• sarcolemma.
• sarcomere.
• sarcoplasmic reticulum.

Oxygen debt in muscles may develop because of:

• the inability of respiratory and circulatory systems to supply enough oxygen to skeletal muscles when used strenuously for a minute or two.
• the inability of myoglobin molecules to store enough oxygen when skeletal muscles are used strenuously for a minute or two.
• too much oxygen used in forming pyruvic acid when skeletal muscles are contracted strenuously for a minute or two.
• too high a concentration of oxygen in the atmosphere.

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What is 1?

• Sarcomere

• Actin (thin filament)

• Myosin (thick filament)

• Z line

What ion is released from the muscle cell when a nerve impulse arrives?

• Sodium

• Calcium

• Potassium

• Chloride

The muscular system interacts with the skeletal system by:

• smooth muscles are joined with spongy bone via cartilage

• skeletal muscles pull on joints to permit movement

• cardiac muscle is connected to the ribs

• skeletal muscles are joined to one another via ligaments

Which parts of your muscular system are voluntary? Select ALL that apply.

• cardiac muscle

• skeletal muscle

• smooth muscle

• none of the above

During short bursts of intense exercise, muscles will use which of the following to replenish ATP? 

• glucose
• fat
• creatine phosphate
• glycogen

Anaerobic respiration

• causes fatigue
• produces lactic acid
• produces oxygen debt
• all of these

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Which of the following MUST be present for aerobic respiration? 

• carbon dioxide
• lactic acid 
• glucose
• oxygen

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