2-Muscle Anatomy 101 & Benefits of Wt

Multiple Choice

Which of the following statements is true about skeletal muscle in the human body?

• Skeletal muscle is the least abundant tissue in the body.

• Skeletal muscle is only found in the legs.

• Skeletal muscle does not help in movement.

• Skeletal muscle makes up about 40% of the body's tissues by mass.

Multiple Choice

What are the two main types of filaments found in a myofibril?

• Troponin and Tropomyosin

• Actin and Myosin

• Collagen and Elastin

• Keratin and Titin

Multiple Select

Which of the following statements about motor units are correct?

• A motor unit is made up of a motor neuron and all the skeletal muscle fibers it innervates.

• All muscle fibers in a motor unit are located adjacent to each other.

• Motor units help coordinate contractions of a single muscle.

• A motor unit can contain both Type I and Type II muscle fibers.

Multiple Choice

What prevents the myosin cross bridges from interacting with actin filaments when the muscle is at rest? Which is the best answer?

• Absence of calcium ions in the sarcoplasmic reticulum.

• Lack of ATP in the muscle fiber.

• Troponin and tropomyosin cover the active sites on actin.

• The sarcomere is fully contracted.

Multiple Choice

Which molecule is required for both contraction and relaxation of muscle fibers?

• Calcium

• ATP

• Troponin

• Myosin

Multiple Choice

Which of the following statements about skeletal muscle fibers is correct?

• They contain multiple nuclei per cell.

• They are always uninucleated.

• They are only found in the heart.

• They do not undergo protein synthesis.

Multiple Select

According to the size principle, which motor units are recruited first during muscle contraction? Choose all that apply

• Low threshold motor units

• High threshold motor units

• Type II muscle fibers

• Type I motor units

Multiple Choice

Which type of resistance is most effective for maximizing strength gains according to the size principle of motor unit recruitment?

• Low resistance with high repetitions

• High resistance with low repetitions (1-5 RM)

• Moderate resistance with moderate repetitions

• Moderate resistance to failure

Multiple Select

Which of the following statements about protective mechanisms in muscles is/are correct?

• Muscle spindles monitor muscle lengthening and protect during fast stretches.

• Golgi tendon organs inhibit muscle contraction when tension is high.

• Muscle spindles are located in tendons.

• Golgi tendon organs are located between regular muscle fibers.

Multiple Choice

What is an isometric contraction?

• Muscle lengthens as it contracts.

• Muscle shortens as it contracts.

• Muscle contraction where the muscle stays the same length.

• The contraction force exceeds the load.

Multiple Select

What is true about ball and socket joints?

• limited range of motion

• Can move in all planes

• Higher risk of injury

• Lower risk of injury

Multiple Choice

Which term refers to the muscle that opposes the primary movement at a joint?

• Agonist

• Synergist

• Antagonist

• Origin

Multiple Choice

A muscle imbalance can be caused by which of the following factors?

• Natural development

• Inactivity

• Bad posture

• All of the above

Multiple Select

Which of the following statements about muscle design is correct?

• Sarcomeres in a series increase velocity

• Pennate muscle arrangement allows for more sarcomeres in parallel, increasing force output.

• Sarcomeres in series increase force output.

• Pennation angle does not affect muscle force.

Multiple Choice

What are benefits of weight training?

• Prevent Injury

• stronger tendons and ligaments

• Increased Resting Metabolic Rate

• All of the above