Exploring the Muscular System

Which type of muscle is found in the heart?

• Skeletal muscle

• Cardiac muscle

• Smooth muscle

• Voluntary muscle

What is the main function of skeletal muscles?

• Pumping blood

• Moving bones

• Digesting food

• Producing hormones

Which muscle type is under voluntary control?

• Cardiac muscle

• Smooth muscle

• Skeletal muscle

• Involuntary muscle

What is the name of the muscle pair that bends and straightens the arm at the elbow?

• Biceps and triceps

• Quadriceps and hamstrings

• Deltoids and pectorals

• Gluteus and gastrocnemius

Which of the following best describes smooth muscle?

• It is attached to bones and helps in movement

• It is found in the walls of internal organs and is involuntary

• It is only found in the heart

• It is always under conscious control

If you are running, which muscle pair in your legs is mainly responsible for bending and straightening your knee?

• Biceps and triceps

• Quadriceps and hamstrings

• Deltoids and pectorals

• Abdominals and obliques

Explain why the heart muscle is considered a special type of muscle.

• Because it is voluntary and found in the arms

• Because it is a type of smooth muscle

• Because it is a type of muscle that works automatically and never tires

• Because it is attached to bones

Which muscle pair works together to move your lower arm up and down?

• Biceps and triceps

• Quadriceps and hamstrings

• Deltoids and trapezius

• Gastrocnemius and tibialis anterior

A student observes that when she bends her arm, her biceps muscle bulges while her triceps relaxes. What can she infer about how muscle pairs work?

• Muscles always contract together

• Muscles in a pair work in opposition; one contracts while the other relaxes

• Both muscles relax at the same time

• Muscles do not work in pairs

Imagine you are designing a robot arm that mimics the human arm. Which principle from the muscular system would you use to make the arm bend and straighten at the elbow?

• Use a single motor to move the arm in both directions

• Use two motors that pull in opposite directions, like biceps and triceps

• Use a spring to move the arm

• Use gravity to move the arm

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