Muscles and How They Work

How does the nervous system coordinate with muscles for movement?

• The nervous system coordinates with muscles through the circulatory system

• The nervous system coordinates with muscles through the digestive system

• The nervous system coordinates with muscles through the respiratory system

• The nervous system coordinates with muscles through motor neurons and neurotransmitters to initiate and control movement.

Describe the sliding filament theory in muscle contraction.

• The sliding filament theory describes muscle contraction as actin filaments sliding over myosin filaments, shortening the sarcomere.

• Muscle contraction in the sliding filament theory is caused by the interaction of actin and myosin filaments without any sliding.

• In the sliding filament theory, the sarcomere lengthens instead of shortening during muscle contraction.

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Discuss the difference between voluntary and involuntary muscle movements.

• Involuntary movements are always painful, while voluntary movements are painless.

• The difference between voluntary and involuntary muscle movements is that voluntary movements are under conscious control, while involuntary movements occur without conscious control.

• Voluntary movements are only seen in animals, while involuntary movements are only seen in plants.

• Voluntary movements are faster than involuntary movements.

How do muscles adapt and grow stronger with regular exercise?

• muscle fibers increase in size and number in response to the stress placed on them during exercise.

• Muscles lose strength with regular exercise

• Muscles become less flexible with exercise

• Muscles shrink in size due to lack of use

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How does aerobic exercise affect the cardiovascular system?

• It decreases the efficiency of the heart, making it work harder for the same output.

• It has no significant impact on the cardiovascular system.

• It increases the risk of heart diseases.

• It improves the efficiency of the heart, increasing blood flow and oxygen supply to muscles.

This type of muscle tissue is attached to bones wand helps control voluntary movement

• Skeletal
• Cardiac
• Smooth

When a muscle contracts, it _______

• gets longer
• gets shorter
• gets thinner
• grows hair

Name the highlighted muscle

• quadraceps

• hamsting

• rectus abdominals

• deltoid

Name the highlighted muscle

• tricep

• bicep

• bicep femoris

• extensor longus