Muscular Diagnostic

Which type of muscle tissue is found in the heart?

• Voluntary Muscle

• Skeletal Muscle

• Cardiac Muscle

• Smooth Muscle

Answer explanation

The correct type of muscle tissue found in the heart is Cardiac Muscle.

What is the shape of smooth muscle fibers?

• Triangular

• Branched

• Spindle-shaped

• Cylindrical

Answer explanation

Smooth muscle fibers are spindle-shaped in structure.

Which muscle tissue type is under voluntary control?

• Involuntary Muscle

• Skeletal Muscle

• Smooth Muscle

• Cardiac Muscle

Answer explanation

Skeletal Muscle is the muscle tissue type under voluntary control.

What is the term for the ability of muscle tissue to stretch?

• Contractility

• Extensibility

• Elasticity

• Excitability

Answer explanation

The term for the ability of muscle tissue to stretch is called Extensibility.

What is the name of the protein that makes up thin filaments in a sarcomere?

• Myosin

• Troponin

• Tropomyosin

• Actin

Answer explanation

The correct protein that makes up thin filaments in a sarcomere is Actin.

What is the role of ATP in muscle contraction?

• It binds to actin

• It forms cross bridges

• It blocks myosin bonding sites

• It binds to myosin head allowing it to detach

Answer explanation

ATP binds to myosin head allowing it to detach, enabling muscle relaxation during muscle contraction.

What happens to the Z lines during muscle contraction?

• They move further apart

• They move closer together

• They disappear

• They stay the same

Answer explanation

During muscle contraction, the Z lines move closer together, allowing the sarcomere to shorten and generate force.

What is the function of troponin in muscle contraction?

• It forms the M line

• It binds calcium ions and moves tropomyosin

• It blocks myosin bonding sites

• It hydrolyzes ATP

Answer explanation

Troponin binds calcium ions and moves tropomyosin, allowing for muscle contraction to occur.

What is the term for the main muscle doing the work in a movement?

• Origin

• Insertion

• Agonist

• Antagonist

Answer explanation

The term for the main muscle doing the work in a movement is called the Agonist.

What is the name of the repeating sections in a myofibril?

• Z lines

• Actin filaments

• Myosin heads

• Sarcomeres

Answer explanation

Sarcomeres are the repeating sections in a myofibril where the actin and myosin filaments are organized, allowing for muscle contraction.