Question 1

Which of the following best describes the relationship between motor unit size and movement precision?

Accepted Answer

Small motor units are found in muscles requiring precise control, such as those in the eyes.

Question 2

During a biceps curl, which type of contraction occurs as you slowly lower the weight back down?

Accepted Answer

Isotonic eccentric contraction

Question 3

A muscle is fixed at both ends and stimulated with a load greater than its maximum tension. Which type of contraction occurs?

Accepted Answer

Isometric contraction

Question 4

Which process allows a muscle to maintain tension for a sustained period without exhausting all motor units simultaneously?

Accepted Answer

Asynchronous motor unit summation

Question 5

If a muscle produces a tension of $$4\ \mathrm{kg}$$ and is required to lift a load of $$2\ \mathrm{kg}$$, what type of contraction will occur?

Accepted Answer

Isotonic concentric contraction

Question 6

Which of the following statements about muscle tone is correct?

Accepted Answer

Muscle tone is the resting tension in a skeletal muscle that stabilizes body position.

Question 7

A cyclist in the Tour de France shifts to a lower gear while climbing a hill. According to muscle contraction principles, what happens to the load and speed of contraction?

Accepted Answer

Load decreases and speed increases.

Question 8

Which equation best represents the relationship between load ($$L) $$and speed of contraction ($$v) in $$skeletal muscle?

Accepted Answer

$$v \propto \frac{1}{L}$$

Question 9

Which mechanism is NOT involved in returning a muscle to its resting length after contraction?

Accepted Answer

Active shortening by the muscle itself

Question 10

During an isometric contraction, which of the following occurs?

Accepted Answer

Muscle length remains constant while tension changes.

Question 11

Which of the following best describes recruitment in skeletal muscle contraction?

Accepted Answer

Activation of the smallest motor units first, followed by larger ones as tension increases.

Question 12

A person is holding a bag of groceries without moving their arm. Which type of contraction is primarily occurring in the arm muscles?

Accepted Answer

Isometric contraction

Question 13

Which of the following is a real-life example of an isotonic concentric contraction?

Accepted Answer

Lifting a dumbbell during a biceps curl

Question 14

What is the primary reason muscles appear firm and well-defined even at rest?

Accepted Answer

High levels of muscle tone

Question 15

Which of the following best explains why elevated muscle tone can contribute to weight loss over time?

Accepted Answer

Elevated muscle tone increases resting energy consumption continuously.

Question 16

Which scenario illustrates an isotonic eccentric contraction?

Accepted Answer

A muscle lengthens while controlling the descent of a heavy object.

Question 17

Which of the following is true about fasciculations?

Accepted Answer

They involve the synchronous contraction of a motor unit.

Question 18

If a muscle develops peak tension less than the load, and the muscle elongates, which contraction type is occurring?

Accepted Answer

Isotonic eccentric contraction

Question 19

Which of the following best describes the effect of gravity on muscle relaxation?

Accepted Answer

Gravity assists opposing muscle groups in returning a muscle to its resting length.

Question 20

Which formula best represents the condition for an isotonic concentric contraction to occur?

Accepted Answer

$$T \u003e L$$

Types of Skeletal Muscle Contraction and Motor Unit Function

Study Guide - Practice Questions

Study Guide - Flashcards