Which of the following is NOT a type of muscle tissue found in the human body?

• Skeletal

• Cardiac

• Smooth

• Epithelial

What is the primary function of skeletal muscle?

• Pumping blood throughout the body

• Moving the skeleton to provide voluntary movement

• Absorbing nutrients from food

• Producing hormones

Which connective tissue surrounds each individual skeletal muscle fiber?

• Epimysium

• Perimysium

• Endomysium

• Fascia

Arrange the following structures in order from largest to smallest in the organization of skeletal muscle: muscle, myofibril, muscle fiber, sarcomere, myofilaments.

• Muscle → muscle fiber → myofibril → sarcomere → myofilaments

• Muscle fiber → muscle → myofibril → myofilaments → sarcomere

• Myofibril → muscle fiber → muscle → sarcomere → myofilaments

• Muscle → myofibril → muscle fiber → myofilaments → sarcomere

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NGSS.HS-LS1-2

Which statement best describes the sarcomere?

• It is the connective tissue that surrounds a group of muscle fibers

• It is the basic contractile unit of muscle

• It is a type of muscle cell found only in the heart

• It is a protein that stores oxygen in muscle cells

Why is the presence of striations in skeletal muscle fibers significant?

• It indicates the muscle is involuntary

• It shows the muscle is capable of thermogenesis

• It reflects the organized arrangement of contractile proteins for efficient contraction

• It means the muscle is only found in the digestive tract

How does skeletal muscle contribute to maintaining body temperature?

• By storing fat

• Through thermogenesis during contraction

• By producing sweat

• By absorbing heat from the environment

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NGSS.HS-LS1-3

Which connective tissue separates one muscle group from another?

• Epimysium

• Perimysium

• Endomysium

• Fascia

Which protein filament is attached to the end walls of the sarcomere?

• Myosin

• Actin

• Troponin

• Tropomyosin

What is the main function of myosin in muscle contraction?

• Stores calcium ions

• Acts as a neurotransmitter

• Forms cross bridges that attach to actin

• Breaks down acetylcholine