Understanding Muscle Types and Anatomy

Which of the following is a characteristic feature of skeletal muscle cells?

• They are spindle-shaped.

• They are multinucleated.

• They lack striations.

• They are involuntary.

What is the primary function of smooth muscle tissue?

• Voluntary movement of the skeleton.

• Pumping blood through the heart.

• Involuntary control of internal organs.

• Generating heat through shivering.

Which protein is primarily responsible for the contraction of skeletal muscles?

• Myosin

• Actin

• Tropomyosin

• Troponin

Where is smooth muscle typically found in the human body?

• Attached to bones

• In the walls of hollow organs

• In the heart

• In the brain

What is the role of calcium ions in skeletal muscle contraction?

• They bind to myosin heads.

• They bind to troponin, causing a conformational change.

• They provide energy for the contraction.

• They break down ATP.

Which of the following best describes the structure of a sarcomere?

• The basic unit of smooth muscle.

• The basic unit of cardiac muscle.

• The basic unit of skeletal muscle.

• The basic unit of nervous tissue.

What is the primary neurotransmitter involved in skeletal muscle contraction?

• Dopamine

• Serotonin

• Acetylcholine

• Norepinephrine

Which of the following is NOT a function of smooth muscle?

• Regulating blood flow

• Moving food through the digestive tract

• Voluntary movement of limbs

• Controlling the diameter of airways

What is the name of the connective tissue that surrounds an entire skeletal muscle?

• Endomysium

• Perimysium

• Epimysium

• Sarcolemma

Which type of muscle tissue is characterized by the presence of intercalated discs?

• Skeletal muscle

• Smooth muscle

• Cardiac muscle

• None of the above