Exploring the Muscular System

Which of the following is a type of muscle found in the human body?

• Cardiac

• Skeletal

• Smooth

• All of the above

What is the primary function of skeletal muscles?

• Pumping blood

• Facilitating movement

• Digesting food

• Producing hormones

Identify the protein that forms the thick filaments in muscle fibers.

• Actin

• Myosin

• Troponin

• Tropomyosin

Which muscle group is primarily responsible for extending the knee?

• Hamstrings

• Quadriceps

• Calves

• Gluteals

Explain how the structure of a muscle fiber contributes to its function.

• Muscle fibers are long and cylindrical, allowing for contraction and relaxation.

• Muscle fibers are short and flat, providing stability.

• Muscle fibers are spherical, enabling rotation.

• Muscle fibers are irregularly shaped, allowing for flexibility.

Which of the following best describes the role of the sarcomere in muscle contraction?

• It stores calcium ions.

• It is the basic contractile unit of muscle fiber.

• It transports oxygen to muscles.

• It provides energy for muscle contraction.

What is the main characteristic of smooth muscle tissue?

• It is voluntary and striated.

• It is involuntary and non-striated.

• It is voluntary and non-striated.

• It is involuntary and striated.

Which major muscle group is located in the upper arm and is responsible for flexing the elbow?

• Triceps

• Biceps

• Deltoids

• Pectorals

Describe the role of actin in muscle contraction.

• Actin binds to calcium ions to initiate contraction.

• Actin forms cross-bridges with myosin for muscle contraction.

• Actin stores energy for muscle contraction.

• Actin transports nutrients to muscle cells.

Which muscle type is primarily responsible for the movement of food through the digestive tract?

• Skeletal muscle

• Cardiac muscle

• Smooth muscle

• Voluntary muscle