Chapter 5.2-1 - Skeletal Muscle Actions - The Motor Unit

Multiple Choice

Why is it important to study anatomy and physiology when learning about the human body?

• To understand how the body functions and maintains health

• To memorize the names of all body parts

• To learn only about diseases

• To focus only on physical appearance

Multiple Choice

Which of the following best describes the relationship between the muscular system and the nervous system?

• They function independently of each other.

• The muscular system controls the nervous system.

• The nervous system stimulates muscle tissue to develop tension.

• Muscle tissue can develop tension without nerves.

Multiple Choice

What is the typical range of skeletal muscle fibers that a single motor neuron may connect to?

• 10 to 100

• 100 to 2,000

• 2,000 to 10,000

• 10,000 to 20,000

Multiple Choice

Which muscles are most likely to have small motor units with few fibers per unit?

• Muscles surrounding the hips

• Muscles in the eyes and fingers

• Muscles in the legs

• Muscles in the back

Multiple Choice

Which of the following best describes a motor unit?

• A group of muscle fibers controlled by one motor neuron

• A single muscle fiber controlled by multiple neurons

• A group of neurons controlling one muscle fiber

• A muscle fiber and its surrounding connective tissue

Multiple Select

Which of the following statements about acetylcholine is/are correct? Select All That Apply (3 Are Correct)

• It is a neurotransmitter that stimulates muscle fibers.

• It makes the sarcolemma temporarily permeable.

• It is released when a nerve impulse reaches the end of an axon terminal.

• It is a protein that forms muscle fibers.

Multiple Choice

Based on the diagram, what is the role of the synaptic cleft in the neuromuscular junction?

• It stores acetylcholine for later use.

• It is the gap through which neurotransmitters diffuse to reach the muscle fiber.

• It generates the action potential directly.

• It connects the axon terminal to the sarcolemma physically.

Multiple Choice

Which of the following statements about sarcomere contraction is correct?

• Cross bridges form when myosin heads attach to actin filaments.

• Actin filaments shorten by breaking down.

• Myosin filaments slide along actin filaments.

• Sarcomeres lengthen during contraction.

Multiple Choice

Which of the following processes occur during the return of a muscle fiber to its resting state?

• Sodium ions diffuse back out of the cell.

• Calcium ions remain in the cytoplasm.

• Cross bridges remain attached.

• Actin filaments stay contracted.

Multiple Choice

Based on Figure 5.8, what happens to muscle tension as the frequency of stimulation increases from A to C?

• Tension decreases steadily.

• Tension remains constant.

• Tension increases and reaches a sustained maximum.

• Tension fluctuates randomly.

Multiple Choice

What is one key function of the muscular system in the human body?

• Movement of body parts

• Production of hormones

• Protection against pathogens

• Absorption of nutrients